CCSD1Z00000100000052CCSD1R00000300000032 DELIMITER=EOF;TYPE=CCSD1F000001; CCSD1C00000400000013 ADI=NURSHA02; CCSD1R00000300000032 DELIMITER=EOF;TYPE=CCSD1D000002; UPPER ATMOSPHERE RESEARCH SATELLITE (UARS) HALOGEN OCCULTATION EXPERIMENT (HALOE) STANDARD FORMATTED DATA UNITS (SFDU) LEVEL 2 METADATA DOCUMENT Software Version 4.56 Data Version 16 I. WHOLE DATA SET DataSetName: HALOE_Level2_data DataSource: Satellite/Instrument = UARS/HALOE UARS = Upper Atmosphere Research Satellite HALOE = Halogen Occultation Experiment Scientific Contact: Dr. James M. Russell, III HALOE Principal Investigator Mail Stop 401B NASA Langley Research Center Hampton, VA 23665 (804) 864-5691 HALOE::RUSSELL (E-mail) Source Characteristics: The UARS spacecraft is in a nominal orbit of 57 degrees inclination and 585 km altitude. HALOE is a solar occultation instrument viewing the atmosphere for each spacecraft sunrise and sunset event (nominally 15 of each per day). The latitude/longitude location of the HALOE data varies with the spacecraft- Earth-sun position. For a given day, the locations tend to be in two distinct latitude bands and to sweep across the full longitude range. Coverage across the full range of latitudes is achieved on a time period ranging from about two to six weeks depending upon the time of year. The latitude coverage extends from 80 deg S to 80 deg N. Thus far HALOE has collected data during three antarctic springs, two arctic springs, and 5 polar summers. Investigation Objectives: The overall goal of HALOE is to provide fundamental measurements needed to investigate upper atmosphere chemistry, dynamics, and radiative processes. Specific goals are: (1) improve understanding of stratospheric ozone depletion due to the oxides of chlorine, nitrogen, and hydrogen by collecting and analyzing global vertical profile data on temperature and key chemical species (O3, HCl, CH4,H2O, NO, NO2, and aerosol extinction), and (2) study the chlorofluoromethane impact on ozone including interactions among oxides of chlorine, nitrogen, and hydrogen by measuring HF in addition to the other key chemical species, and by using data on CF2Cl2, CFCl3, and ClONO2 obtained from the CLAES experiment on UARS. InstrumentAttributes: HALOE is a satellite solar occultation experiment designed to monitor the vertical distributions of HCl, HF, CH4, and NO by gas filter correlation radiometry and H2O, NO2, O3, and temperature versus pressure using CO2 absorption by broadband filter radiometry (Russell et al., 1993a). Aerosol extinction is directly measured in each of the gas filter channel wavelengths which range from 2.5 to 5.26 m (Hervig, et al., 1993). The broad band radiometer measurements range from 2.7 to 10 m wavelength. As viewed from UARS, there are typically 15 sunrises and 15 sunsets per day. For each sunrise and sunset event, HALOE automatically acquires the sun and goes through a series of operational modes. These modes include balance of the gas filter correlation channels, limb to limb scans of the solar disk, a calibration sequence involving viewing the sun through a series of gas cells and neutral density filters, and finally an atmospheric track mode. The balance, solar scan, and calibration modes occur while HALOE is viewing the sun above the atmosphere. The solar scans provide exoatmospheric (or above the atmosphere) signals to determine the intensity profile of the sun. The atmospheric track mode provides a measurement of the atmospheric attenuation of the solar intensity. During the balance, calibration, and atmospheric track modes, the HALOE field-of-view is locked on the solar disk at a point nominally 4 to 8 arc minutes below the top edge. The solar scan and atmospheric track measurements provide the principal information needed to derive the desired atmospheric parameter profiles. During the non-event periods, HALOE is in a gimbal stow position. Gas Filter Correlation Radiometer Principle - Solar energy enters the gas correlation section of the instrument and is divided for each channel (HCl, HF, NO, CH4) into two paths. The first path contains a cell filled with the type of gas to be measured; the second is a vacuum path. Each of these paths has its own detector. The output of these detectors is electronically differenced yielding the measurement output. During the portion of an event when the line of sight is outside of the Earth's atmosphere, the gas channel gains are balanced so that the difference output is close to zero. During an occultation when the target gas is present in the atmospheric path, the atmosphere introduces a spectral content into the incoming solar energy signal which is correlated with the absorption line spectrum of the gas cell. This correlation causes a difference signal which can be related to the concentration of the gas in the atmosphere. Aerosol absorption has only a small effect on measurements from these channels. Broadband Filter Radiometer Principle - The channels for H2O, NO2, O3, and CO2 are conventional broadband filter radiometers. The instrument signal is a direct measurement of the energy absorbed during occultation. The ratio of the atmospheric signal to the exoatmospheric signal is a measure of the atmospheric transmission in the optical path. Aerosol absorption has a large effect on the radiometer measurements but signal correction methods have been developed which work very well (Hervig et al., 1993). The HALOE overview paper by Russell et al., 1993a gives a complete description of the experiment, instrument techniques, and estimated error effects. It also shows typical pressure versus latitude cross section results for the September 21 to October 15, 1992 time period. Measured Parameters: Vertical Altitude Parameter Resolution Range HCl 4.5 km 10-60 km HF 4.5 km 10-60 km CH4 4.5 km 15-75 km NO 4.5 km 10-130 km (below 78 km) 6.5 km (above 78 km) 10-20 km Aerosol 2-3 km 10-50 km (HCl, HF CH4, NO Channels) O3 2-3 km 10-85 km H2O 3-4 km 10-75 km NO2 2-3 km 10-55 km Temperature 4.5 km 10-130 km Lit References: Journal articles describing the experiment, scientific results, and preliminary data validations results are listed below. HALOE Journal Publications as of January 9, 1995. Eckman, R. S., R. E. Turner, W. T. Blackshear, T. D. A. Fairlie, and W. L. Grose, Some Aspects of the Interaction Between Chemical and Dynamical Processes Relating to the Antarctic Ozone Hole, Space Research, Vol. 13, No. 1, pp.(1)311-(1)319,1993. Hervig, M. E., J. M. Russell III, L. L. Gordley, J. H. Park, and S. R. Drayson, Observations of Aerosol by the HALOE Experiment Onboard UARS: A Preliminary Validation, Geophys. Res. Lett., 20, No 12, 1291-1294, June 18, 1993 Luo, M., R .J. Cicerone, J. M. Russell III, and T. Huang, HALOE Observations of Stratospheric Hydrogen Fluoride (Submitted to J. Geophys. Res., February, 1994) Luo, M., J. M. Russell III, R. I. Cicerone, and L. L. Gordley, Analysis of Selected Nitric Oxide Observations in the Lower Thermosphere by HALOE on UARS , Geophys. Res. Lett., 20, No. 12, 1307-1310, June 18, 1993 Luo, M., A. V. R. Schiano, J. M. Russell III, L. L. Gordley, K. A. Stone, and R. J. Cicerone, Using AVS to View HALOE 3-D Satellite Data, in visualization Techniques in Space and Atmospheric Sciences, edited by E. P. Szuszczewicz and J. Bradekamp, NASA printing Office, Washington, D. C., 1994 Mote, T. L., J. R. Holton, J. M. Russell III, and B. A. Boville, A Comparison of Observed (HALOE) and Modeled (CCM2) Methane and Stratospheric Water Vapor, Geophys. Res. Lett., 20, No. 14, 1419-1422, July 23, 1993 Pierce, R. B., W. L. Grose, J. M. Russell III, and A. F. Tuck, 1994: Evolution of Southern Hemisphere Spring Air Masses Observed by HALOE, Geophys. Res. Lett., February 1, 1994 Tuck, A. F., J. M. Russell III, and J. E. Harries, Stratospheric Dryness: Antiphased Desiccation Between Micronesia and Antarctica, Geophys. Res. Lett., 20, No 12, 1227-1230, June 18, 1993 Tuck, A. F., J. M. Russell III, S. J. Hovde, K. K. Kelly, C. R. Webster, and R. D. May, Intercomparison of HALOE and ER-2 Aircraft Data Collected During the Second Airborne Arctic Stratospheric Experiment AASE-II), Geophys. Res. Lett., 20, No. 12, 1243-1246, June 18, 1993 Russell, J. M. III, L. L. Gordley, J. H. Park, S. R. Drayson, D. H. Hesketh, R. I. Cicerone, A. F. Tuck, J. E. Frederick, J. E. Harries, and P. J. Crutzen, The Halogen Occultation Experiment, J. Geophys. Res., 98, No. D6, 10,777-10,797, June 20, 1993 Russell, J. M. III, A. F. Tuck, L. L. Gordley, J. H. Park, S. R. Drayson, J. E. Harries, R. I. Cicerone, and P. J. Crutzen, HALOE Antarctic Observations in the Spring of 1991, Geophys. Res. Lett., 20, No. 8, 719-722, April, 23, 1993 Russell, J. M. III, L. L. Gordley, L. E. Deaver, R. E. Thompson, and J. H. Park, An Overview of the Halogen Occultation Experiment (HALOE) and Preliminary Results, Adv. in Space Res.,14,No.9, pp(9) 13, 1994. HALOE Papers Submitted Bithell, M., T. J. Gray, J. E. Harries, J. M. Russell, and A. Tuck, On the effects of HALOE Data Sampling (Accepted by J. Atm. Sci., August 1994). Bruhl, C., S. R. Drayson, J. M. Russell III, J. McInerney, H. Claude, H. Gernand, and T. McGee, HALOE Channel Validation, (Submitted to J. Geophys. Res., 1994). Deaver, Lance E., L. L. Gordley, J. M. Russell III, and Mark E. Hervig, An Error Analysis for the Halogen Occultation Experiment, (Submitted to J. Geophys. Res., 1994). Douglas, A. R., M. R. Schoeberl, R. S. Stolarski, J. W. Waters, J. M. Russell III, and A. E. Roche, Interhemispheric Differences in Springtime Deactivation of Vortex ClO (Submitted to J. Geophys. Res., 1994). Eckman, R. S., W. L. Grose, R. E. Turner, W. T. Blackshear, J. M. Russell III, L. Froidevaux, J. W. Waters, J. B. Kumer, A. E. Roche, Stratospheric Trace Constituents Simulated by a Three-Dimensional General Circulation Model: Comparison with UARS Data (Submitted to J. Geophys. Res., 1994). Geller, Marvin A., Valery Yudin, A. R. Douglass, J. W. Waters, L. S. Elson, A. E. Roche, and J. M. Russell, UARS Measurements Verification of the Polar Processing Paradigm (Submitted to Geophys. Res. Lett., August 1994). Gordley, L. L., J. M. Russell III, J. E. Frederick, T. Mickley, G. Beaver, K. Stone, and J. H. Park, Validation of HALOE NO and NO2 Observations, (Submitted to J. Geophys. Res., 1994). Gordley, L. L., J. M. Russell III, L. J. Mickley, J. E. Frederick, J. H. Park, K. A. Stone, G. M. Stone, G. M. Beaver, J. M. McInerney, L. E. Deaver, G. C. Toon, F. J. Murcray, M. R. Gunson, and J. P. D. Abbatt, Validation of Nitric Oxide and Nitrogen Dioxide Measurements Made by HALOE for the UARS Platform. Harries, J. E., J. M. Russell III, J. H. Park, A. F. Tuck, S. R. Drayson Observations of Absorbing Layers in the Antarctic Stratosphere in October 1991 (submitted to Quart. J. Roy. Met. Soc., 1993) Harries, J. E., J. M. Russell III, A. F. Tuck, L. L. Gordley, P. Purcell K. Stone, S. Oltmans, W. A. Traub, R. Bevilacqua, and M. R. Gunson, Validation of Measurements of Water Vapor from the Halogen Occultation Experiment, HALOE, (Submitted to J. Geophys. Res., 1994) Hervig, M. E. , J. M. Russell III, L. L.. Gordley, J. Daniels, S. R.. Drayson, and J. H. Park, Aerosol Effects and Corrections in the Halogen Occultation Experiment (Submitted to J. Geophys. Res., February, 1994) Hervig, M. E. , J. M. Russell III, L. L.. Gordley, and S. R.. Drayson, Validation of HALOE Aerosol Measurements, (Submitted to J. Geophys. Res., 1994). Hervig, M. E. , S. R.. Drayson, J. M. Russell III, L. L.. Gordley, K. Stone, and E. Thompson, Validation of HALOE Temperature Measurements, (Submitted to J. Geophys. Res., 1994). Luo, Mingzhao, R. J. Cicerone, and J. M. Russell, HALOE Observations of CH4 and HF and their correlations, (Submitted to J. Geophys. Res., 1994). Morris, G. A., L. Elson, J. Waters, R. A. Suttie, A. Roche, J. Kumer, J. M. Russell III, Trajectory Mapping of Upper Atmosphere Research Satellite (UARS) Data (Submitted to J. Geophys. Res., 1994). Muller, R., P. J. Crutzen, J. Gross, C. Bruhl, and J. M. Russell III Chemical Ozone Depletion in the Arctic Vortex During the Winter of 1993: UARS/HALOE Satellite Measurements and Model Results (Submitted to Nature, 1993) Park, J. H., J. M. Russell III, Summer Polar Chemistry Observations in the Stratosphere made by HALOE (Accepted by J. Atm. Sci., August 1994). Park, J. H., J. M. Russell III, An Ozone Cavity in the Summer Polar Stratosphere Observed by HALOE (Submitted to Nature, January, 1994) Park, J. H., J. M. Russell III, L. L.. Gordley, D. Chris Benner, J. McInerney, M. R. Gunson, G. G. Toon, E. C. Zipf, and P. Erdman, HALOE CH4 Validation ((Submitted to J. Geophys. Res., 1994). Pierce, R. B., W. L. Grose, J. M. Russell III, and A. F. Tuck, 1994: Spring Dehydration in the Antarctic Vortex Observed by HALOE, (Submitted to Geophys. Res. Lett., February, 1994) Randall, W. J., F. Wu, J. M. Russell III, J. W. Waters, L. Froidevaux, Ozone and Temperature Changes in the Stratosphere Following the Eruption of Mt. Pinatubo, (Submitted to J. Geophys. Res., 1994). Russell, James M. III, L. E. Deaver, M. Luo, J. H. Park, L. L. Gordley, A. F. Tuck, G. C. Toon, M. R. Gunson, W. A. Traub, D. G. Murcray, and R. Zander, Validation of Hydrogen Chloride Measurements made by HALOE from the UARS Platform, (Submitted to J. Geophys. Res., 1994). Russell, James M. III, L. E. Deaver, M. Luo, R. J. Cicerone, J. H. Park, L. L. Gordley, G. C. Toon, M. R. Gunson, W. A. Traub, and R. Zander, Validation of Hydrogen Fluoride Measurements made by HALOE from the UARS Platform, (Submitted to J. Geophys. Res., 1994). Schoeberl, M. R., M. Luo, and J. E. Rosenfield, An Analysis of the Antarctic HALOE Trace Gas Observations (Accepted by J. Geophys. Res., September 1994). Tuck, A. F. J. M. Russell III, S. J. Hovde, and K. A. Stone, Diabatic Cooling Rates at the Center of the Antarctic Vortex Directly Inferred from HALOE Observations of Water Vapor (Submitted to Geophys. Res. Lett., 1993) Webster, C. R., R. D. May, L. Jaegle, H. Hu, S. P. Sander, M. R. Gunson, G. C. Toon, J. M. Russell III, R. Stimpfle, J. Koplow, R. J. Salawitch, H. A. Michelson, Hydrochloric Acid and the Chlorine Budget of the Stratosphere. DataProcessingOverview: HALOE Level 2 processing uses one Level 1 daily product file as input. Each Level 1 file includes the complete set of sunrise/sunset events during that day. Additional inputs are spectral line parameters and spectral filter functions for each gas filter channel and band averaged emissivity tables for each radiometer channel. The resulting products are profiles of temperature, pressure, altitude, and mixing ratios of H2O, NO2, O3, NO, CH4, HCl, HF and aerosol extinction (km -1)at five wavelengths. Level 2 processing consists of two principal programs: HALORET and CNDNS2. HALORET encompasses all of the processing for retrieving temperature, pressure, gas mixing ratio profiles and aerosol extinction profiles. HALORET processes sequentially through each event (sunrise/sunset) in a day of Level 1 data. Within each event the pressure and temperature retrieval is done first followed by the NO, NO aerosol, a repeat of temperature, H2O, a repeat of NO, followed by NO2, O3, CH4, HCl, HF, CH4 aerosol, HCl aerosol, HF aerosol and CO2 aerosol. The order is required because some gases are secondary absorbers in other channels and because of the need for an accurate aerosol profile before radiometer channels can be processed. Other than the need for NMC data below 40 km and a temperature model above 80 km, HALOE data is self sufficient. All significant secondary absorbers are retrieved in various channels and used in later retrievals. DataQuality: The data have undergone extensive validation review. Results have been compared to a variety of correlative measurements, as well as data from other UARS instruments. Although all channels have produced high quality results, currently (4/94) there are known and suspected errors that we will review below. These errors are judged to have only a minor impact on many scientific studies. We start with general comments, then proceed with comments specific to individual parameters. General Comments The HALOE processing produces retrieved profiles of temperature, pressure, HF, HCl, CH4, NO, NO2, O3, and H2O. In addition, aerosol extinction profiles are retrieved for each modulation channel wavelength, 2.45, 3.4, 3.47, and 5.26 microns and the CO2 channel wavelength of 2.8 microns. Although some improvements are still to come, current results for all products are suitable for research use, if quality and error estimates are closely observed. Error Estimates Error estimates in the data set do not include systematic components. Only noise error and error due to aerosol correction are estimated and root sum squared. This underestimates errors where these two mechanisms are no the dominant error source but is accurate at high altitudes and in conditions of heavy aerosol for O3, H2O and NO2. For HF, HCl, CH4, NO and aerosol the total error at low altitudes (below 25 km) is much greater than indicated by the recorded error. At the completion of the validation effort, systematic components will be reported in the validation papers. The high altitude errors listed in the data can over estimate the error in conditions of low signal to noise (S/N) by sometimes as much as a factor of four. This is due to low signal smoothing and retreival stability procedures that were not correctly incorporated in the error estimates. For retrieved values that are a factor of 2 or more larger than estimated errors, the estimates are accurate. Much of the improved low S/N results come in at the expense of lower resolution. Aerosol Effects Pinatubo aerosol induces retrieval error in several ways, including solar tracking difficulties, aliasing of vertically sharp extinction features and extinction uncertainty in the radiometer channels (NO2, H2O, and O3). In addition, early in the mission (October 91 through March 92), the altitude coverage was severely limited due to attenuation at solar tracking wavelengths and acquisition strategies that had to be refined. Sunsets in 1991 are often limited to above 25 km while sunrises seldomly probed below 30 km. Attenuation at the science channel and tracker wavelengths continued to substantially limit altitude range in the tropics until late 1992. The following pages give a brief overview of the status of each HALOE product with comments on errors and features observed in the data. Profiles are generally characterized by large random errors at high altitudes where signals are small which we call the upper region, an altitude range of best sensitivity which we call the middle region, and large error conditions at a low altitude which we call the lower region. Each region is defined and salient points noted. Resolution The vertical resolution of the data varies with channel and is not equivalent to point spacing. Several factors contribute to the resolution. Instrument optics, signal measurement bandwidth and data processing procedures are the primary factors. Although the field of view projects to roughly 1.6 km at the limb, when combined with the electronic bandpass and solar sink rate, the natural instrument resolution varies between about 2 and 3 km, (depending on the sink rate). Events viewed parallel to the orbital plane have faster sink rates than events viewed at large angles to the orbital plane (large beta angle). The resolution can be further degraded by the processing. In fact, nearly any attempt at improving the stability of retrievals has the consequence of smoothing results in the vertical. The lower the S/N the more instability, requiring more smoothing. The finite point spacing can further degrade the resolution unless the signal is highly over sampled. Each HALOE channel is processed with point spacing and smoothing chosen to give a good balance between stability and resolution. The low S/N regions (mainly upper altitudes) are smoother than the high signal regions. For the radiometer retrievals (NO2, H2O, O3 and aerosols) the advantages of the highly over sampled HALOE data are used to achieve results very close to the natural instrument resolution (2 to 3 km) in regions of sufficient signal. The compu- tationally intensive gas channels (HF, HCl, CH4 and NO) have been limited to 3 km point spacing in the processing, which limits effective resolution to about 4.5 km. At high altitude (dependent on channel, but always above the stratopause), an additional smoothing of the signal is performed, before processing, that is inversely proportional to S/N. This smoothing starts when signals drop below a S/N of 20 and is limited to no more than a 5 km smoothing. Consequently, resolution at the higher altitudes will be closer to 6 or 7 kilometers, quickly improving as signal increases at lower altitudes. Although variable smoothing can violate conservation of signal rules, the error is a very small fraction of total estimated error. Estimates of resolution are contained in table 1.0. The above discussion pertains strictly to Level 2 data. The gridded Level 3a product, which is the only product currently available at the DAAC, is put on UARS standard pressure grid points that result in roughly a 2.5 km point spacing. This can severely alias the HALOE O3, H2O, NO2 and aerosol data which often resolve real features under 2 km in height (although at reduced amplitude). Therefore, if the higher resolution information is important to the user, the Level 2 product should be used. It is planned for future releases to include a product for delivery to the DAAC with a format nearly identical to 3a but with a grid spacing closer to 0.5 km. This will coincide with future HCl, HF, CH4 and NO releases at point spacings near 1 km to attain a resolution closer to the natural 2-3 km instrument resolution. (Note that for this discussion we define a resolution, say 4 km, as a Gaussian apodization of the perfectly resolved signal transform in which the amplitude of an 8 km wave (needed to detect 4 km features) would be attenuated by 50%. Therefore even 1 km features may be detected with sufficient sampling, although the amplitude would be reduced by 94%.) Bottom Points of Profiles The HALOE data retrieval depends on a very accurate and precise characterization of the solar source function and knowledge of the exact position of the function being viewed. The bottom altitude of an event is where the sun tracking position was either acquired or lost. Even though a solid lock-on may exist, the data may be slightly corrupted by the time delay of the measurement response. Considerable effort to correct for this effect and filter out bad data has been performed, but there is still evidence that points within 1 km of the bottom of profiles sometimes (though rarely) have residual error of this type. This is another mechanism that contributes to the more variable nature of the bottom of profiles. The following discussion details accuracy, range, and features unique to each product are discussed below. OVERVIEW OF HALOE DATA STATUS ----------------------------------------------------------------------------- | LOWER REGION | MIDDLE REGION | UPPER REGION | ----------------------------------------------------------------------------- Temperature | Bottom of profile | 35km - about 80km | Above 80km | & Pressure | to 35km NMC data | | | | | | | | There is also some | Explicitly retrieved| At present only a | | indication of a | 2-5 degrees K | crude climatologi- | | slight pressure | precision. 3-5 | cal shape is | | registration | degrees K cold bias | spliced on to the | | problem. Further | within +/- 5km of | 80km values. | | improvement awaits | stratopause. | Can be very | | better CO2 line | | inaccurate. | | data, currently | | | | being analyzed. | | | ----------------------------------------------------------------------------- | LOWER REGION | MIDDLE REGION | UPPER REGION | ----------------------------------------------------------------------------- O3 | Profile bottom to | 25km to 60km. | 60km to top of | | 25km. | | profile (typically | | | | 90km) | | This region | Very good. On order | | | displays quite | of 5% error. However| Degrades consis- | | variable accuracy | for extremely low | tently with noise, | | depending on | values in the meso- | but low signal to | | aerosol. For clear | sphere, be cognizant| noise results can | | conditions such as | of error values. | be a factor of 2- | | found after late | Averaging profiles | 4 better than | | 1993 and sometimes | can improve results | indicated error | | in the polar vortex| where noise | values. To achieve | | the error is on the| dominates by as much| this, signal | | order of 15%. For | as a factor of 4. | smoothing was per- | | heavy aerosol | Digitization and low| formed at the ex- | | conditions it may | signal biases limit | pense of vertical | | be as poor as 50%. | further improvement.| resolution which | | Observe error bars.| | drops from about | | | | 2.5km in high S/N | | | | to about 6km at top| | | | of profile. Above | | | | 80km it is more | | | | accurate to convert| | | | to number density. | ----------------------------------------------------------------------------- | LOWER REGION | MIDDLE REGION | UPPER REGION | ----------------------------------------------------------------------------- H2O | Bottom 5km of | Boundary of lower | Above 50 km to 80 | | profile | region to 50 km | km | | | | | | This region can | Results are very | Dominated by noise.| | display large error| good. Excellent | Averaging data can | | under heavy aerosol| agreement with | produce means con- | | conditions. Observe| microwave near | sistent with noise | | error bars. Under | stratopause. However| dominated results. | | clear conditions | there is a 15-20% | Large wave features| | results agree very | low bias with ATMOS | are mostly noise | | well with frost | yet comparison with | artifacts. The sig-| | point measurements,| balloon spectrometer| nals were smoothed | | 5% mean error, +/- | measurements yield | in the vertical, | | 10%. 15% lower than| typically 10% | depending on signal| | Lyman alpha | differences or less | level, to improve | | techniques. | with little apparent| S/N at the expense | | | bias. Features in | of resolution | | | this region appear | which drops from | | | faithful to | about 2.5 km to | | | dynamics. Large | 6 km at top of | | | aerosol concen- | profile (usually | | | trations early in | near 80km). | | | the mission show | | | | some sign of causing| | | | a low bias, but this| | | | is not yet con- | | | | clusive. Precision | | | | error is less than | | | | 5%. | | | | | | ----------------------------------------------------------------------------- | LOWER REGION | MIDDLE REGION | UPPER REGION | ----------------------------------------------------------------------------- NO2 | Bottom 5 km | 25 to 45 km | Above 45 km | | | | | | NO2 is quite var- | Except early in the | Noise dominated. | | iable, especially | mission near the | Top 2 to 3 km of | | in a relative | tropics under the | profile can be | | sense,due to small | heavy aerosol cond- | biased high due to | | concentration | itions, results | retrieval con- | | values and high | appear, +/- 10% to | straints used to | | sensitivity to | +/- 15% with balloon| start processing in| | aerosols. Must pay | and ATMOS. Small | low S/N conditions.| | close attention to | features above 35km | High winter lat- | | error bars. Large | are usually noise | itudes will some- | | aerosol conditions | artifacts. Observe | times allow ret- | | appear to over | error values. | rievals to extend | | correct giving low | | above the typical | | values. There are | | 50 to 55 km limit. | | many small features| | | | in the vicinity of | | | | heavy aerosol that | | | | are strictly | | | | artifacts due to | | | | uncertainty in aer-| | | | osol absorption. | | | | However, clear air | | | | conditions appear | | | | to be giving | | | | excellent results | | | | down to the trop- | | | | opause. | | | | | | | ----------------------------------------------------------------------------- | LOWER REGION | MIDDLE REGION | UPPER REGION | ----------------------------------------------------------------------------- CH4 | Bottom 6km | Lower boundary to | Above 60km | | | 60 km | | | | | | | In general, results| Results look very | Results look very | | appear very good, | good and are con- | good and are con- | | +/- 15% with photo-| sistent with error | sistent with noise | | chemical and | bars above 45km | dominated signals. | | dynamical consis- | although in low S/N | Averaging data can | | tency. There are | conditions the error| improve the means | | some artifacts | bars can be as much | by up to factor | | (found in less than| as a factor of 2 too| of 4 to 6 over | | 1% of profiles) | large. Below 50km | single profiles. | | that appear as a | errors are on the | Error bars for low | | high value spike | order of +/-10% with| S/N are too large | | for the bottom | a possible low bias | by up to a factor | | point in the pro- | of about 5%. | of 2 for signal | | file. These are due| Features correlate | profiles due to | | to tracking and | well with other | smoothing of low | | signal disconti- | channels. See same | signals. | | nuities at lower | profile for HF and | | | altitudes that were| HCl. | | | unintentionally | | | | allowed to propa- | | | | gate into results. | | | | These are flagged | | | | in the quality | | | | files but were not | | | | successfully | | | | screened from the | | | | data. As with other| | | | species under clear| | | | air conditions, | | | | good results can | | | | reach as low as | | | | 10km. | | | | | | | ----------------------------------------------------------------------------- | LOWER REGION | MIDDLE REGION | UPPER REGION | ----------------------------------------------------------------------------- HCl | Bottom 6 km | Lower region | Above 50 km. | | | boundary to 50 km | | | | | | | | | | | The large inter- | This has shown good | This region is con-| | ference due to CH4,| results, RMS diff- | sistent with high | | low mixing ratios, | erences of 15% with | noise conditions. | | and effects of | correlative measure-| The data can be | | sharp aerosol | ments, but a mean | averaged to reduce | | layers on the | bias of -8%. This | mean errors a | | finite field of | bias changes with | factor of 2 to 6 | | view, combine to | orbital condition | relative to single | | cause large var- | and is thought to be| profiles. The | | iability in the | a spectral calibra- | variable bias error| | lower stratosphere.| tion problem. | discussed for the | | 30% standard dev- | | middle regions is | | iation about the | | most pronounced at | | mean is typically | | high altitudes. | | early in the | | It is thought to | | mission (1991,1992)| | vary from about | | However later | | -5% to -20%. It is | | results and clear | | still being invest-| | air conditions have| | igated with a | | shown good agree- | | correction expected| | ment with correla- | | in the coming year.| | tive measurements, | | | | 15% STD. | | | | | | | ----------------------------------------------------------------------------- | LOWER REGION | MIDDLE REGION | UPPER REGION | ----------------------------------------------------------------------------- HF | Bottom 6 km | Lower region | Above 50 km | | | boundary to 50 km | | | | | | | HF has shown good | This altitude range,| Dominated by noise.| | agreement with | typically 25 to | As with other | | correlative data | 50 km, has shown | species data can | | over all altitudes | excellent agreement | be averaged to get | | sensed. Small | with correlative | good mean profiles.| | mixing ratios and | data +/-15% with | The single profile | | optical effects | less than 5% bias. | error bars can be a| | from aerosol layers| | factor of 2 too | | can cause large | | large in low S/N | | variation of errors| | due to low signal | | at low levels. | | smoothing. | | Early in the | | | | mission through | | | | 1992, they were | | | | typically +/-0.2 | | | | ppb or +/- 30% | | | | whichever is great-| | | | er. However, for | | | | clear air con- | | | | ditions much better| | | | results are | | | | realized. | | | | | | | ----------------------------------------------------------------------------- | LOWER REGION | MIDDLE REGION | UPPER REGION | ----------------------------------------------------------------------------- NO | Bottom 6 km | Lower boundary to | Above 55 km | | | 55 km | (often to 130 km) | | | | | | Low mixing ratios | In general, good | This region is | | in the lower | results have been | dominated by random| | stratosphere limit | observed with | noise error. The | | the retrieval acc- | correlative data. | mesospheric minimum| | uracy at these | Below the strato- | observed everywhere| | levels. Systematic | spheric peak com- | but the winter | | errors and inter- | parisons have ranged| hemisphere drops | | ference from other | from excellent | below noise level | | absorbers combine | agreement to 30% | to the extent that | | to give a STD of | low. Above the peak | even averaged | | about 0.1 ppb or | HALOE seems to | results are | | higher. Results | average about 20% | questionable except| | less than 0.2 ppb | low with differences| for establishing | | are usually un- | ranging from zero | upper limits. At | | certain. However | to 40%. The sparcity| high altitudes, | | elevated levels at | and varying accuracy| above 90 km, | | low altitudes under| of correlative | signals are above | | clear conditions | measurements has | the noise and have | | are accurately | made conclusions | given good agree- | | sensed. | difficult, but there| ment with ATMOS | | | is suspicion that | data analyses by | | | there may be an | APL (private com- | | | orbital dependent | munication). Good | | | bias similar to HCl.| correlation with | | | | solar activity has | | | | been observed. If | | | | an orbital related | | | | bias exists, it | | | | will exist at these| | | | levels as well. | | | | | | | | | ----------------------------------------------------------------------------- | LOWER REGION | MIDDLE REGION | UPPER REGION | ----------------------------------------------------------------------------- Aerosol | Below the peak. | From peak to alt- | Above where | | | itude where extinc- | extinction values | | | tion drops to | remain less than | | | 1 X 10e-5 /km | 1 X 10e-5 /km | | | | | | The aerosol data | Results appear very | This region is dom-| | from all indica- | good, on the order | inated by noise | | tions is excellent | of 5% or better | error. Although | | for results re- | until degraded by | values are recorded| | trieved from the | noise at higher alt-| for altitudes as | | HF,HCl,CH4, and NO | itudes. | high as 90 km, any | | channels. The | | extinction values | | extinction inferred| | below 3 X 10e-6 | | from the CO2 | | are likely noise. | | channel is much | | Even though data | | more uncertain for | | precision appears | | a variety of | | to be better, due | | reasons. The NO | | to smoothing low | | channel aerosol is | | signals, biases | | accurate to 5% or | | due to signal | | better for values | | drifts and digiti- | | above 1 X 10e-4 as | | zation can cause | | inferred from | | some artifacts as | | correlative | | large as 6 X 10e-6 | | comparisons of H2O,| | /km. To date, | | O3, and NO2 that | | nothing above 50 km| | require aerosol | | has been found that| | extinction esti- | | appears to be real.| | mates as derived | | | | from NO aerosol | | | | results. For | | | | extinction peak | | | | values above | | | | 2 X 10e-3, results | | | | below the peak | | | | degrade rapidly due| | | | to obscuration. | | | | Observe error bars.| | | | | | | ----------------------------------------------------------------------------- Level 3at Quality Numbers and Comments: NOTE: This paragraph applies to level 3at data only, but is included in this level 2 metadata. Quality numbers and comments have been assigned for each day and each constituent of level 3at HALOE data. This is an explanation of abbreviations used: ************************************************************** Key to Abbreviations: --------------------- AS = Solar Array Snap corrupts Exoatmospheric Voltage signal CL = Possible Cirrus cloud, Possible Aerosol correction error GC = General Comment (Data is not believed to be bad) HB = High Beta Operations (Reason for missing profiles) LL = Latitude LB = Low Beta LN = Longitude LSN = Low Signal/Noise LV = Large Variability--for big error bars. ME = Missing Events MO = Mode (R=Rise, S=Set) OP = Operations Problem PC = Problem Comment (Data is believed to be suspect) SE = Short Events (Reason for missing profiles) SS = SunSpot TE = Tracking Error due to aerosols ------------------------------------ EXAMPLE: R=18N,90E,150MB,PC=CL S=42S,200-360E,150-300MB,PC=CL R=18N: SUNRISE at 18 North Latitude 90E: Latitude 90 East 150MB: Pressure level at 150 millibars PC=CL: Problem Comment = Possible Cirrus Cloud S=42S: SUNSET at 42 South Latitude 200-360E: Longitudes from 200 to 360 East 150-300MB: Pressure levels from 150 to 300 millibars PC=CL: Problem Comment = Possible Cirrus Clouds ************************************************************** DataUsage: Level 2 data consists of atmospheric profiles at vertical spacing varying between .3 and 5.0 km. Level I data has a vertical spacing of 0.3 km, corresponding roughly to the HALOE measurement rate of 8 samples per second. Multiple Level I data points can contribute to each Level 2 retrieval point. The spacing between retrieval points can vary both from channel to channel and within a retrieval profile of a particular channel. The latitude and longitude location varies with each data point due to motion of the spacecraft during the length of the occultation event. As mentioned above, the Level 3a data is put on a common grid spacing, but unfortunately the coarseness of the UARS common grid can alias the information in the HALOE NO2, O3 and H2O and aerosol profiles. This washes out fine details, but should not affect most studies. At present only the level 3a data is available from the DAAC. DataOrganization: Level 2 data is organized into one file per day. Each daily file covers the sunrise and sunset events for the day (typically 29 or 30 total). At the beginning of each file, there is a block of summary information. The files are then organized by event. For each event, the file includes a standard header with summary event information; the key Level 1 data needed to do the Level 2 retrievals; and the Level 2 results. FileClassRelationships: The HALOE LEVEL 2 software produces one product file for each UARS day of processing. FileClassName: HALOE_level2_Data RecordTypeNames: SFDU header, Summary section (13 records), Data header for event #1, Data for event #1, Data header for event #2, Data for event #2, . . . . . . . . . . . . . . . . . . . Data header for event #n, Data for event #n, FileClassSyntax: The syntax is described below. This is not a structured on a fixed record format. FileClassFieldRelationships: The summary records, which are always records 2 through 14 must be read first to establish what general data is in the file. Then each Data header record must be read to establish what data is available for that event. The HALOE level 2 files has the following general format. 1) SFDU header 2) Summary section 3) Data header for first event 4) Data for first event . . . Sections 3 and 4 are repeated for each event. The structure of each of these event is described below. LEVEL 2 SFDU HEADERS (SOFTWARE VERSION 4.55 DATA VERSION 16) -------------------------------------------------- RECORD CONTENTS 1 SFDU Header CHARACTER*72 The contents are as follows, "CCSD1Z00000100000052CCSD1R00000300000032DELIMITER=EOF;TYPE=NURS1I00H A02;" 2 RecordName: Header_type RecordStructure: Fixed length RecordLength: 22 bytes RecordFieldNames: CHFH, NWORDS, NHDLEV2, NHEAD RecordSyntax: 4 Fields 1: CHFH 2: NWORDS 3: NHDLEV2 4: NHEAD Field 1. FieldName: Character descriptor FieldNnemonic: CHFH FieldSyntax: Character scalar FieldUnits: none FieldResolution: n/a FieldRange: 'LV2FG ' FieldDescription: Describes nature data in NHEAD FieldRepresentation: CHARACTER*10 Field 2. FieldName: NWORDS FieldNnemonic: NWORDS FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: =2 FieldDescription: Number of elements following in this record FieldRepresentation: INTEGER*4 Field 3. FieldName: NHDLEV2 FieldNnemonic: NHDLEV2 FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: the version number FieldDescription: Level 2 file generation number INTEGER*4 FieldRepresentation: INTEGER*2 Field 4. FieldName: NHEAD FieldNnemonic: NHEAD FieldSyntax: A scalar FieldUnits: none FieldResolution: n/a FieldRange: n/a FieldDescription: Number of values in the level 2 header FieldRepresentation: INTEGER*4 3 RecordName: Comments RecordStructure: Variable length RecordFieldNames: CHFH, NCOM, COMMENT RecordSyntax: 3 Fields 1: CHFH 2: NWORDS 3: COMMENT Field 1. FieldName: Character descriptor FieldNnemonic: CHFH FieldSyntax: Character scalar FieldUnits: none FieldResolution: n/a FieldRange: 'COMMENT ' FieldDescription: Describes nature data in NHEAD FieldRepresentation: CHARACTER*10 Field 2. FieldName: NWORDS FieldNnemonic: NWORDS FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: max value = 250 FieldDescription: Number of elements following in this record FieldRepresentation: INTEGER*4 Field 3. FieldName: COMMENT FieldNnemonic: COMMENT FieldSyntax: array FieldUnits: none FieldResolution: n/a FieldRange: n/a FieldDescription: Comments about processing FieldRepresentation: CHARACTER*80 4. RecordName: General Info on the file RecordStructure: Fixed length RecordFieldNames: CHFH, NWORDS, UARS_DAY, NL1EVNTS5, NRET, NSKIPPED RecordSyntax: 6 Fields 1: CHFH 2: NWORDS 3: UARS_DAY 4: NL1EVNTS5 5: NRET 6: NSKIPPED Field 1. FieldName: Character descriptor FieldNnemonic: CHFH FieldSyntax: Character scalar FieldUnits: none FieldResolution: n/a FieldRange: 'UARS_DAY ' FieldDescription: Describes nature data in NHEAD FieldRepresentation: CHARACTER*10 Field 2. FieldName: NWORDS FieldNnemonic: NWORDS FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: =4 FieldDescription: Number of elements following in this record FieldRepresentation: INTEGER*4 Field 3. FieldName: UARS_DAY FieldNnemonic: UARS_DAY FieldSyntax: SCALAR FieldUnits: DAY FieldResolution: 1 FieldRange: Entire mission FieldDescription: The uars day number FieldRepresentation: INTEGER*4 Field 4. FieldName: NL1EVENTS FieldNnemonic: NL1EVENTS FieldSyntax: SCALAR FieldUnits: none FieldResolution: n/a FieldRange: Less than or equal 31 FieldDescription: Number of events in the level 1 file FieldRepresentation: INTEGER*4 Field 5. FieldName: NRET FieldNnemonic: NRET FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: Less than or equal 31 FieldDescription: Number of events retrieved FieldRepresentation: INTEGER*4 Field 6. FieldName: NSKIPPED FieldNnemonic: NSKIPPED FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: Less than or equal 31 FieldDescription: Number of events skipped FieldRepresentation: INTEGER*4 5 RecordName: SKIPPED EVENTS RecordStructure: FIXED LENGTH RecordFieldNames: CHFH, NWORDS, NSKIPPED RecordSyntax: 3 Fields 1. CHFH 2. NWORDS, 3. NSKIPPED Field 1. FieldName: Character descriptor FieldNnemonic: CHFH FieldSyntax: Character scalar FieldUnits: none FieldResolution: n/a FieldRange: 'EVN SKIPD ' FieldDescription: Describes nature data in NHEAD FieldRepresentation: CHARACTER*10 Field 2. FieldName: NWORDS FieldNnemonic: NWORDS FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: =32 FieldDescription: Number of elements following in this record FieldRepresentation: INTEGER*4 Field 3. FieldName: NSKIPPED FieldNnemonic: NSKIPPED FieldSyntax: vector FieldUnits: n/a FieldResolution: n/a FieldRange: 0 or 2 FieldDescription: Array of skipped events NSKIPPED(i)=0 means event i was processed NSKIPPED(i)=2 means event i was not processed FieldRepresentation: INTEGER*4 6 RecordName: Average sunset Info RecordStructure: FIXED LENGTH RecordFieldNames: CHFH, NWORDS, AVGLAT_SS, AVGVELS_SS, AVGVELA_SS RecordSyntax: 5 Fields 1: CHFH 2: NWORDS 3: AVGLAT_SS 4: AVGVELS_SS 5: AVGVELS_SS Field 1. FieldName: Character descriptor FieldNnemonic: CHFH FieldSyntax: Character scalar FieldUnits: none FieldResolution: n/a FieldRange: 'AVG SET ' FieldDescription: Describes nature data in NHEAD FieldRepresentation: CHARACTER*10 Field 2. FieldName: NWORDS FieldNnemonic: NWORDS FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: =3 FieldDescription: Number of elements following in this record FieldRepresentation: INTEGER*4 Field 3. FieldName: AVGLAT_SS FieldNnemonic: AVGLAT_SS FieldSyntax: scalar FieldUnits: deg FieldResolution: varies FieldRange: -81 to 81 FieldDescription: Average 30 km Tangent Point Altitude (TPA) latitude for SS events FieldRepresentation: REAL*4 Field 4. FieldName: AVGVELS_SS FieldNnemonic: AVGVELS_SS FieldSyntax: scalar FieldUnits: km/sec FieldResolution: FieldRange: FieldDescription: Average 30 km TPA S/C velocity relative to the sun for SS events (km/sec) FieldRepresentation: REAL*4 Field 5. FieldName: AVGVELS_SS FieldNnemonic: AVGVELS_SS FieldSyntax: scalar FieldUnits: km/sec FieldResolution: FieldRange: FieldDescription: Average 30 km TPA S/C velocity relative to the atmosphere for SS events (km/sec) FieldRepresentation: REAL*4 7 RecordName: Average sunrise Info RecordStructure: FIXED LENGTH RecordFieldNames: CHFH, NWORDS, AVGLAT_SR, AVGVELS_SR, AVGVELA_SR RecordSyntax: 5 Fields 1: CHFH 2: NWORDS 3: AVGLAT_SR 4: AVGVELS_SR 5: AVGVELA_SR Field 1. FieldName: Character descriptor FieldNnemonic: CHFH FieldSyntax: Character scalar FieldUnits: none FieldResolution: n/a FieldRange: 'AVG RISE ' FieldDescription: Describes nature data in record FieldRepresentation: CHARACTER*10 Field 2. FieldName: NWORDS FieldNnemonic: NWORDS FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: n/a FieldDescription: Number of elements following in this record FieldRepresentation: INTEGER*4 Field 3. FieldName: AVGLAT_SR FieldNnemonic: AVGLAT_SR FieldSyntax: scalar FieldUnits: km FieldResolution: varies FieldRange: -81 to 81 FieldDescription: Average 30 km TPA latitude for SS events FieldRepresentation: REAL*4 Field 4. FieldName: AVGVELS_SR FieldNnemonic: AVGVELS_SR FieldSyntax: scalar FieldUnits: km/sec FieldResolution: n/a FieldRange: abs value 1.0 to 7.1 FieldDescription: Average 30 km TPA S/C velocity relative to the sun for SR events FieldRepresentation: REAL*4 FIELD 5. FieldName: AVGVELA_SR FieldNnemonic: AVGVELA_SR FieldSyntax: SCALAR FieldUnits: km/sec FieldResolution: n/a FieldRange: abs value 1.0 to 7.1 FieldDescription: Average 30 km TPA S/C velocity relative to the atm for SR events FieldRepresentation: REAL*4 8 RecordName: Event Type Info RecordStructure: FIXED LENGTH RecordFieldNames: CHFH, NWORDS, EVNT_TYPE RecordSyntax: 3 Fields 1: CHFH 2: NWORDS 3: EVNT_TYPE Field 1. FieldName: Character descriptor FieldNnemonic: CHFH FieldSyntax: Character scalar FieldUnits: none FieldResolution: n/a FieldRange: 'SUM RS ' FieldDescription: Describes nature data in record FieldRepresentation: CHARACTER*10 Field 2. FieldName: NWORDS FieldNnemonic: NWORDS FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: n/a FieldDescription: Number of elements following in this record FieldRepresentation: INTEGER*4 Field 3. FieldName: EVNT_TYPE FieldNnemonic: EVNT_TYPE FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: 'SUN SET ' or 'SUN RISE ' FieldDescription: Event type of each event used for summary data FieldRepresentation: CHARACTER*10 9 FieldNames: Latitude Info on all events RecordStructure: FIXED LENGTH RecordFieldNames: CHFH, NWORDS, SUM_LAT RecordSyntax: 3 Fields 1: CHFH CHARACTER 2: NWORDS 3: SUM_LAT Field 1. FieldName: Character descriptor FieldNnemonic: CHFH FieldSyntax: Character scalar FieldUnits: none FieldResolution: n/a FieldRange: 'SUM LAT ' FieldDescription: Describes nature data in record FieldRepresentation: CHARACTER*10 Field 2. FieldName: NWORDS FieldNnemonic: NWORDS FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: 30 FieldDescription: Number of elements following in this record FieldRepresentation: INTEGER*4 FIELD 3. FieldName: SUM_LAT FieldNnemonic: SUM_LAT FieldSyntax: VECTOR FieldUnits: deg FieldResolution: varies FieldRange: -81 to 81 FieldDescription: 30 km TPA latitudes for each summary event (degrees) FieldRepresentation: REAL*4 10 FieldNames: Longitude Info on all events RecordStructure: FIXED LENGTH RecordFieldNames: CHFH, NWORDS, SUM_LON RecordSyntax: 3 Fields 1: CHFH 2: NWORDS 3: SUM_LON Field 1. FieldName: Character descriptor FieldNnemonic: CHFH FieldSyntax: Character scalar FieldUnits: none FieldResolution: n/a FieldRange: 'SUM LON ' FieldDescription: Describes nature data in record FieldRepresentation: CHARACTER*10 Field 2. FieldName: NWORDS FieldNnemonic: NWORDS FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: 30 FieldDescription: Number of elements following in this record FieldRepresentation: INTEGER*4 FIELD 3. FieldName: SUM_LON FieldNnemonic: SUM_LON FieldSyntax: VECTOR FieldUnits: deg FieldResolution: varies FieldRange: 0 TO 360 FieldDescription: 30 km TPA longitudes for each summary event (degrees) FieldRepresentation: REAL*4 11 FieldNames: Summary of spacecraft velocity relative to sun RecordStructure: FIXED LENGTH RecordFieldNames: CHFH, NWORDS, (SUM_VELS(I),I=1,NWORDS) RecordSyntax: 3 Fields 1: CHFH 2: NWORDS 3: SUM_VELS Field 1. FieldName: Character descriptor FieldNnemonic: CHFH FieldSyntax: Character scalar FieldUnits: none FieldResolution: n/a FieldRange: 'SUM LON ' FieldDescription: Describes nature data in record FieldRepresentation: CHARACTER*10 Field 2. FieldName: NWORDS FieldNnemonic: NWORDS FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: =30 FieldDescription: Number of elements following in this record FieldRepresentation: INTEGER*4 FieldName: SUM_VELS FieldNnemonic: SUM_VELS FieldSyntax: vector FieldUnits: km/sec FieldResolution: FieldRange: FieldDescription: 30 km TPA S/C velocity relative to the sun for each summary event FieldRepresentation: REAL*4 12 FieldNames: Summary of spacecraft velocity relative to the atmosphere RecordStructure: FIXED LENGTH RecordFieldNames: CHFH, NWORDS, SUM_VELA FieldNames: 3 Fields 1: CHFH 2: NWORDS 3: SUM_VELA Field 1. FieldName: Character descriptor FieldNnemonic: CHFH FieldSyntax: Character scalar FieldUnits: none FieldResolution: n/a FieldRange: 'SUM VELA ' FieldDescription: Describes nature data in record FieldRepresentation: CHARACTER*10 Field 2. FieldName: NWORDS FieldNnemonic: NWORDS FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: =30 FieldDescription: Number of elements following in this record FieldRepresentation: INTEGER*4 Field 3. FieldName: SUM_VELA FieldNnemonic: SUM_VELA FieldSyntax: vector FieldUnits: km/sec FieldResolution: n/a FieldRange: abs value 1.0 to 7.1 FieldDescription: 30 km TPA S/C velocity relative to the sun for each summary event FieldRepresentation: REAL*4 13 FieldNames: Information on the following records RecordStructure: FIXED LENGTH FieldNames: CHFH, NWORDS FieldNames: CHFH CHARACTER, NWORDS FIELDSYNTAX: 2 Fields 1: CHFH 2: NWORDS Field 1. FieldName: Character descriptor FieldNnemonic: CHFH FieldSyntax: Character scalar FieldUnits: none FieldResolution: n/a FieldRange: 'LAST RECORD' FieldDescription: Describes nature data in record FieldRepresentation: CHARACTER*10 Field 2. FieldName: NWORDS FieldNnemonic: NWORDS FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: n/a FieldDescription: NOT USED FieldRepresentation: INTEGER*4 The header record consists of a fixed length record of a 127 by 4 byte array. The structure and content of this record is described below. HALOE STANDARD HEADER RECORD RecordName: HALOE Standard Header RecordDescription: The HALOE standard header record contains information about the status of the UARS and the HALOE instrument during the occultation. It also contains information about the options that were used in the data reduction algorithms. RecordStructure: Fixed Length RecordContents: LABEL, NHEAD, NHDLEV, HDTYP, HEAD(NHEAD) CHARACTER*10 LABEL INTEGER*4 NHEAD INTEGER*4 NHDLEV INTEGER*4 HDTYP REAL*4 HEAD(NHEAD) LABEL is a character label showing the type of header. For a HALOE level 2 file this is 'STD_L2 '. NHEAD is the number of 4 byte words have been written out following HDTYP. For the HALOE level 2 file this is 127. NHDLEV is the file generation number. A change in the structure of this file will cause a change in this number. For the HALOE level 2 file this is 17. HDTYP is an integer number that corresponds to the header type. This number will change only if the LABEL has changed. For the HALOE level 2 file this is 2. HEAD is an array of 4 byte words of length NHEAD which contain the header values. The values located in each position are described below. FieldName: Start_time FieldNnemonic: DATES FieldSyntax: SCALAR FieldUnits: UARS Date Format (UDTF) FieldResolution: DAYS FieldRange: Instrument lifetime FieldDescription: Day component of Start time of event HEADPosition: 1 FieldRepresentation: INTEGER*4 FieldName: Start_time FieldNnemonic: TIMES FieldSyntax: SCALAR FieldUnits: UARS TIME Format (UDTF) FieldResolution: milliseconds FieldRange: 0 to 86400000 FieldDescription: Milli second component of Start time of event HEADPosition: 2 FieldRepresentation: INTEGER*4 FieldName: Start_time FieldNnemonic: DATEE FieldSyntax: SCALAR FieldUnits: UARS Date Format (UDTF) FieldResolution: DAYS FieldRange: Instrument lifetime FieldDescription: Day component of END of event HEADPosition: 3 FieldRepresentation: INTEGER*4 FieldName: Start_time FieldNnemonic: TIMEE FieldSyntax: SCALAR FieldUnits: UARS TIME Format (UDTF) FieldResolution: milliseconds FieldRange: 0 to 86400000 FieldDescription: Milli second component of END of event HEADPosition: 4 FieldRepresentation: INTEGER*4 FieldName: MODE FieldNnemonic: MODE FieldSyntax: SCALAR FieldUnits: NONE FieldResolution: NA FieldRange: 8 OR 10 FieldDescription: (8 = sunset event, 10 = sunrise event) HEADPosition: 5 FieldRepresentation: INTEGER*4 FieldName: NEVENT FieldNnemonic: NEVENT FieldSyntax: SCALAR FieldUnits: NONE FieldResolution: 1 FieldRange: 1 TO 31 FieldDescription: Event number for the day HEADPosition: 6 FieldRepresentation: INTEGER*4 FieldName: SANG FieldNnemonic: SANG FieldSyntax: SCALAR FieldUnits: RADIANS FieldResolution: 1.745e-4 FieldRange: -0.332 to -0.366 FieldDescription: The value of the first point in the apparent zenith angle array. HEADPosition: 7 FieldRepresentation: REAL*4 FieldName: AINC FieldNnemonic: AINC FieldSyntax: SCALAR FieldUnits: RADIANS FieldResolution: n/a FieldRange: 0.75E-4 to 1.11e-4 FieldDescription: The apparent zenith angle increment between data points. HEADPosition: 8 FieldRepresentation: REAL*4 FieldName: SZ FieldNnemonic: SZ FieldSyntax: SCALAR FieldUnits: km FieldResolution: NA FieldRange: 150. FieldDescription: The value of the first point in the apparent tangent altitude array. HEADPosition: 9 FieldRepresentation: REAL*4 FieldName: ZINC FieldNnemonic: ZINC FieldSyntax: SCALAR FieldUnits: km FieldResolution: n/a FieldRange: 0.3 FieldDescription: The apparent altitude increment between data points. HEADPosition: 10 FieldRepresentation: REAL*4 FieldName: NPTS FieldNnemonic: NPTS FieldSyntax: INTEGER*4 FieldUnits: none FieldResolution: n/a FieldRange: 491 FieldDescription: The number of points in the apparent tangent altitude array. HEADPosition: 11 FieldRepresentation: INTEGER*4 FieldName: NRCRDS FieldNnemonic: NRCRDS FieldSyntax: SCALAR FieldUnits: NONE FieldResolution: n/a FieldRange: less than or equal to 223 FieldDescription: The number of records written out following this header record. HEADPosition: 12 FieldRepresentation: INTEGER*4 FieldName: IORB FieldNnemonic: IORB FieldSyntax: SCALAR FieldUnits: none FieldResolution: n/a FieldRange: greater to or equal 425 (depends on lifetime of HALOE) FieldDescription: The UARS orbit number. HEADPosition: 13 FieldRepresentation: INTEGER*4 FieldName: SALT FieldNnemonic: SALT FieldSyntax: SCALAR FieldUnits: KM FieldResolution: N/A FieldRange: 580. to 620. FieldDescription: The UARS altitude at the start time of the event HEADPosition: 14 FieldRepresentation: REAL*4 FieldName: SLAT FieldNnemonic: SLAT FieldSyntax: scalar FieldUnits: deg FieldResolution: n/a FieldRange: -81. to 81. FieldDescription: The UARS subtangent point Latitude at the start time of the event HEADPosition: 15 FieldRepresentation: REAL*4 FieldName: SLON FieldNnemonic: SLON FieldSyntax: scalar FieldUnits: deg (east) FieldResolution: n/a FieldRange: 0. to 360. FieldDescription: The UARS subtangent point Longitude at the start time of the event. HEADPosition: 16 FieldRepresentation: REAL*4 HEADPosition: 17-28 Representation: INTEGER*4 Mnemonic: NERROR(12) Units: none Description: The number of parity errors occurrences in the science channels. In the following order: CO2, H2O, NO2, O3, CH4, CH4dV, HCl, HCldV, NO, NOdV, HF, HFdV FieldName: EXOSIG(12) FieldNnemonic: EXOSIG(12) FieldSyntax: array(12) FieldUnits: volts FieldResolution: n/a FieldRange: 2.5 to 3.5 FieldDescription: The exo-atmospheric signals for each science channel. In the following order: CO2, H2O, NO2, O3, CH4, CH4dV, HCl, HCldV, NO, NOdV, HF, HFdV HEADPosition: 29-40 FieldRepresentation: REAL*4 FieldName: SIGVAL FieldNnemonic: SIGVAL(12) FieldSyntax: array FieldUnits: arcminutes FieldResolution: n/a FieldRange: 3 or less FieldDescription: The one sigma value for the Gaussian apodization function for each channel. In the following order: CO2, H2O, NO2, O3, CH4, CH4dV, HCl, HCldV, NO, NOdV, HF, HFdV HEADPosition: 41-52 FieldRepresentation: REAL*4 FieldName: ERAD90 FieldNnemonic: ERAD90 FieldSyntax: scalar FieldUnits: km FieldResolution: n/a FieldRange: 6355. to 6379 FieldDescription: The Earth radius for the subtangent point of the 90 km apparent tangent altitude ray. HEADPosition: 53 FieldRepresentation: REAL*4 FieldName: ERAD30 FieldNnemonic: ERAD30 FieldSyntax: scalar FieldUnits: km FieldResolution: n/a FieldRange: 6355. to 6379 FieldDescription: The Earth radius for the subtangent point of the 30 km apparent tangent altitude ray. HEADPosition: 54 FieldRepresentation: FieldName: ERAD6 FieldNnemonic: ERAD6 FieldSyntax: scalar FieldUnits: km FieldResolution: n/a FieldRange: 6355. to 6379 FieldDescription: The Earth radius for the subtangent point of the 6 km apparent tangent altitude ray. HEADPosition: 55 FieldRepresentation: REAL*4 FieldName: RDT FieldNnemonic: RDT(4) FieldSyntax: array FieldUnits: K FieldResolution: n/a FieldRange: 288. to 308. FieldDescription: The average detector housing temperatures for HALOE bolometer channels. In the following order: CO2, H2O, NO2, O3 HEADPosition: 56-59 FieldRepresentation: REAL*4 FieldName: STDEV_RDT FieldNnemonic: STDEV_RDT(4) FieldSyntax: array FieldUnits: K FieldResolution: n/a FieldRange: 0.0 to 0.3 FieldDescription: The standard deviation about the mean detector housing temperatures for HALOE bolometer channels. In the following order: CO2, H2O, NO2, O3 HEADPosition: 60-63 FieldRepresentation: REAL*4 FieldName: FILT_T FieldNnemonic: FILT_T(4) FieldSyntax: array FieldUnits: K FieldResolution: n/a FieldRange: 288 to 308 FieldDescription: The average spectral filter temperatures for the HALOE gas filter correlation channels. In the following order: CH4, HCl, NO, HF HEADPosition: 64-67 FieldRepresentation: REAL*4 FieldName: STDEV_FILT_T FieldNnemonic: STDEV_FILT_T(4) FieldSyntax: array FieldUnits: K FieldResolution: n/a FieldRange: 0. to 0.3 FieldDescription: The standard deviation about the mean spectral filter temperatures for the HALOE gas filter correlation channels. In the following order: CH4, HCl, NO, HF HEADPosition: 68-71 FieldRepresentation: REAL*4 FieldName: GC_T FieldNnemonic: GC_T(4) FieldSyntax: array FieldUnits: K FieldResolution: n/a FieldRange: 288 to 308 FieldDescription: The average gas cell temperature indicators for the HALOE gas filter correlation channels. In the following order: CH4, HCl, NO, HF HEADPosition: 72-75 FieldRepresentation: REAL*4 FieldName: STDEV_GC_T FieldNnemonic: STDEV_GC_T(4) FieldSyntax: array FieldUnits: K FieldResolution: n/a FieldRange: 0.0 to 0.3 FieldDescription: The standard deviation about the mean gas cell temperature indicators for the HALOE gas filter correlation channels. In the following order: CH4, HCl, NO, HF HEADPosition: 76-79 FieldRepresentation: REAL*4 FieldName: BETA FieldNnemonic: BETA FieldSyntax: scalar FieldUnits: deg FieldResolution: n/a FieldRange: -80 to 80 FieldDescription: The UARS Beta angle. HEADPosition: 80 FieldRepresentation: REAL*4 FieldName: STLAT FieldNnemonic: STLAT FieldSyntax: scalar FieldUnits: deg FieldResolution: n/a FieldRange: -81 to 81 FieldDescription: The Latitude for the subtangent point of the 150 km apparent tangent altitude ray. HEADPosition: 81 FieldRepresentation: REAL*4 FieldName: STLON FieldNnemonic: STLON FieldSyntax: scalar FieldUnits: deg (east) FieldResolution: 0 to 359.99 FieldRange: 0 to 360 FieldDescription: The Longitude for the subtangent point of the 150 km apparent tangent altitude ray. HEADPosition: 82 FieldRepresentation: REAL*4 FieldName: ETLAT FieldNnemonic: ETLAT FieldSyntax: scalar FieldUnits: deg FieldResolution: n/a FieldRange: -81 TO 81 FieldDescription: The Latitude for the subtangent point of the 3 km apparent tangent altitude ray. HEADPosition: 83 FieldRepresentation: REAL*4 FieldName: ETLON FieldNnemonic: ETLON FieldSyntax: scalar FieldUnits: DEG (EAST) FieldResolution: n/a FieldRange: 0. to 350.99 FieldDescription: The Longitude for the subtangent point of the 3 km apparent tangent altitude ray. HEADPosition: 84 FieldRepresentation: REAL*4 FieldName: EVNLAT FieldNnemonic: EVNLAT FieldSyntax: REAL*4 FieldUnits: deg FieldResolution: n/a FieldRange: -81 to 81 FieldDescription: The Latitude for the subtangent point of the 30 km apparent tangent altitude ray. HEADPosition: 85 FieldRepresentation: REAL*4 FieldName: EVNLON FieldNnemonic: EVNLON FieldSyntax: scalar FieldUnits: deg (east) FieldResolution: n/a FieldRange: 0 to 359.99 FieldDescription: The Longitude for the subtangent point of the 30 km apparent tangent altitude ray. HEADPosition: 86 FieldRepresentation: REAL*4 FieldName: EVNVELS FieldNnemonic: EVNVELS FieldSyntax: scalar FieldUnits: km/sec FieldResolution: n/a FieldRange: abs value 1.0 to 7.1 FieldDescription: The Line of Sight separation velocity of the UARS relative to the sun for the 30 km apparent tangent altitude ray. HEADPosition:87 FieldRepresentation: REAL*4 FieldName: EVNVELA FieldNnemonic: EVNVELA FieldSyntax: scalar FieldUnits: km/sec FieldResolution: n/a FieldRange: abs value 1.0 to 7.1 FieldDescription: The Line of Sight separation velocity of the UARS relative to the Earth's atmosphere for the 30 km apparent tangent altitude ray. HEADPosition: 88 FieldRepresentation: REAL*4 FieldName: METHOD FieldNnemonic: METHOD(4) FieldSyntax: array FieldUnits: none FieldResolution: n/a FieldRange: n/a FieldDescription: A code that indicates which simulated signal calculation formula was used for the HALOE gas filter correlation channel retrievals. This feature will be added in a future software version. HEADPosition: 89-90 FieldRepresentation: INTEGER*2 FieldName: IDIFLAG FieldNnemonic: IDIFLAG FieldSyntax: array dimension 10 FieldUnits: none FieldResolution: n/a FieldRange: 1 or 2 FieldDescription: A code that indicates if a diurnal correction for NOx and O3 was applied during the retrievals from each of the retrieval channels. A value of two indicates no diurnal correction and a one indicates that there was a diurnal correction. HEADPosition: 91-95 FieldRepresentation: INTEGER*2 FieldName: MCH4 FieldNnemonic: MCH4 FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: n/a FieldDescription: This is a flag indicating how the CH4 retrievals from the HCl V, CH4 V and CH4 dV retrievals are merged into one profile for use as an interferent in other channels. Currently the HCl V and CH4 V retrievals are not done and this flag is not used. HEADPosition: 96 FieldRepresentation: INTEGER*4 FieldName: EVNSTAT FieldNnemonic: EVNSTAT FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: 0 or 1 FieldDescription: A status indicator for this event. 0 = Signals only, No retrieval done on this event. 1 = Signals and retrieved data. HEADPosition: 97 FieldRepresentation: INTEGER*4 FieldName: PTFLAG FieldNnemonic: PTFLAG FieldSyntax: scalar FieldUnits: none FieldResolution: n/a FieldRange: 0 or 1 FieldDescription: Indicator of the meteorological dataset used to pressure register the HALOE data. 0 = NMC data used. 1 = UKMO data used. HEADPosition: 98 FieldRepresentation: INTEGER*4 FieldName: SMOOTH FieldNnemonic: SMOOTH FieldSyntax: array, dimension 10 FieldUnits: none FieldResolution: n/a FieldRange: 0 to 15 FieldDescription: Mixing ratio vertical smoothing index for the HALOE retrieval channels. For each retrieval, this number represents the width of the Gaussian ( in retrieval points ) that was used to smooth the retrieved profile before output. HEADPosition: 99-104 FieldRepresentation: INTEGER*2 FieldName: INDAERO FieldNnemonic: INDAERO FieldSyntax: array, dimension 12 FieldUnits: none FieldResolution: n/a FieldRange: 12 to 15 FieldDescription: An indicator of the aerosol model which was used in the HALOE retrieval channels. The model number refers to which channel was used to obtain the aerosol extinction. The channels are 12 (NO) 13 (CH4), 14 (HCL), and 15 (HF). HEADPosition: 105-110 FieldRepresentation: INTEGER*2 FieldName: ALTLOW FieldNnemonic: ALTLOW FieldSyntax: scalar FieldUnits: km FieldResolution: n/a FieldRange: Of the order of 5 to 20 km FieldDescription: Lowest apparent tangent altitude with valid signals. HEADPosition: 111 FieldRepresentation: REAL*4 FieldName: ALTHIGH FieldNnemonic: ALTHIGH FieldSyntax: scalar FieldUnits: km FieldResolution: n/a FieldRange: of the order of 140 to 150 FieldDescription: Highest apparent tangent altitude with valid signals. HEADPosition: 112 FieldRepresentation: REAL*4 FieldName: BOTEXC FieldNnemonic: BOTEXC FieldSyntax: scalar FieldUnits: Arcmins converted to diode number FieldResolution: n/a FieldRange: 25 or less FieldDescription: Amount the tracker exceeds when the jitter crosses the 2-diode threshold - indicates loss of track. HEADPosition: 113 FieldRepresentation: REAL*4 FieldName: SOLEXTLO FieldNnemonic: SOLEXTLO FieldSyntax: scalar FieldUnits: arcminutes FieldResolution: n/a FieldRange: less than 32 FieldDescription: Apparent solar extent at ALTLOW HEADPosition: 114 FieldRepresentation: REAL*4 FieldName: APPTOPLO FieldNnemonic: APPTOPLO FieldSyntax: scalar FieldUnits: km FieldResolution: n/a FieldRange: less than 33 FieldDescription: Apparent altitude of the top edge of the sun when at ALTLOW HEADPosition: 115 FieldRepresentation: REAL*4 FieldName: ZA_OFF_SUN FieldNnemonic: ZA_OFF_SUN FieldSyntax: scalar FieldUnits: km FieldResolution: n/a FieldRange: less than 20 FieldDescription: The calculated apparent altitude when the HALOE Field of View begins to slide off the bottom edge of the sun. If this altitude is lower than ALTLOW it is set to -999.00 HEADPosition: 116 FieldRepresentation: REAL*4 FieldName: ZTROP FieldNnemonic: ZTROP FieldSyntax: scalar FieldUnits: km FieldResolution: n/a FieldRange: typical tropopause altitudes FieldDescription: The tropopause altitude derived from the Z, P, T data which was used to pressure registrate the HALOE data. HEADPosition: 117 FieldRepresentation: REAL*4 FieldName: PTROP FieldNnemonic: PTROP FieldSyntax: scalar FieldUnits: mb FieldResolution: n/a FieldRange: typical tropopause pressures FieldDescription: The tropopause pressure derived from the Z, P, T data which was used to pressure registrate the HALOE data. HEADPosition: 118 FieldRepresentation: REAL*4 FieldName: TTROP FieldNnemonic: TTROP FieldSyntax: scalar FieldUnits: K FieldResolution: n/a FieldRange: typical tropopause temperatures FieldDescription: The tropopause temperature derived from the Z, P, T data which was used to pressure registrate the HALOE data. HEADPosition: 119 FieldRepresentation: REAL*4 FieldName: n/a FieldNnemonic: n/a FieldSyntax: n/a FieldUnits: n/a FieldResolution: n/a FieldRange: n/a FieldDescription: These records contains some additional data that was needed to convert a HALOE level 2 file into a HALOE level 1 file. The exact nature of this data is not yet finalized and should not be referenced. HEADPosition: 120-127 FieldRepresentation: REAL*4 DATA SECTION The data section for each event follows the header record for that event. The data record contains NRCRDS records (this value is given in the data header). Each of the NRCRDS has the same format. This format is, CHAR, I, N, ARRAY where This is referenced below as CHAR is a character*10 string DataId: I is an INTEGER*4 number size 0 to 250 DataIndexId: N is an INTEGER*4 number size 0 to 491 ARRAY is a REAL*4 array dimensioned (491,250). RIN Thus each read for this data is of the form READ . . . CHAR, I, N, (ARRAY(L,I),L=1,N) (SEE THE SUBROUTINE RL2DAT AT THE END OF THIS DOCUMENT) The string CHAR and the index I are directly linked to the data in ARRAY. That is there is a one-to-one correspondence between CHAR (the DataId:) and I (the DataIndexId:). Note that if N is zero there is no data available for this record. In the following descriptions of the data the string CHAR is identified as the DataIds:, the index I is the DataIndesIds: and the description of ARRAY is given as FieldDescription:. The units ARRAY and the resolution are listed along with other information that may be helpful to the user. The description of the fields that may be found in this section are listed below. FieldName: Apparent tangent altitudes FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: 0.30 km FieldDescription: DataIds: 'APPTANALT ' DataIndexIds: 1 This is the Level 1 altitude spacing. This grid goes from 0.30 km to 150.0 km and has a total of 491 data points. FieldRepresentation: REAL*4 FieldName: Apparent altitude pressures FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: 0.30 km FieldDescription: DataIds: 'PRAPPTNZ ' DataIndexIds: 9 These are the pressures that correspond to 'APPTANALT '. These are NMC values if PTFLAG = 0. These are UKMO if PTFLAG = 1. FieldRepresentation: REAL*4 FieldName: Apparent tangent altitude temperatures FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: K FieldResolution: 0.30 FieldDescription: DataIds: 'TEMAPPTNZ ' DataIndexIds: 10 These are the temperatures that correspond to 'APPTANALT '. These are NMC values if PTFLAG=0. These are UKMO if PTFLAG = 1. FieldRepresentation: REAL*4 FieldName: Apparent subtangent point latitudes FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: ( deg ) FieldResolution: 0.30 km FieldDescription: DataIds: 'APPTANLAT ' DataIndexIds: 3 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: Apparent subtangent point longitudes FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: ( deg ) FieldResolution: 0.30 km FieldDescription: DataIds: 'APPTANLON ' DataIndexIds: 4 These correspond to 'APPTANALT '. Measured east. FieldRepresentation: REAL*4 FieldName: UKMO pressures for each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: 0.30 km FieldDescription: DataIds: 'UKMOPR ' DataIndexIds: 126 These are the UKMO pressures that correspond to 'APPTANALT '. These are NMC pressures if PTFLAG = 1. FieldRepresentation: REAL*4 FieldName: UKMO temperatures for each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: K FieldResolution: 0.30 km FieldDescription: DataIds: 'UKMOTEMP ' DataIndexIds: 127 These are the UKMO temperatures that correspond to 'APPTANALT '. These are NMC temperatures if PTFLAG = 1. FieldRepresentation: REAL*4 FieldName: Apparent zenith angles for each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians FieldResolution: 0.30 km FieldDescription: DataIds: 'APPZENANG ' DataIndexIds: 2 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: acceleration of gravity for each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: m/s/s FieldResolution: 0.30 km FieldDescription: DataIds: 'GRAV_ACC ' DataIndexIds: 201 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: refraction angle for each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians FieldResolution: 0.30 km FieldDescription: DataIds: 'REFRAC ' DataIndexIds: 206 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: Apparent solar extent for each apparent tangent FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians FieldResolution: 0.30 km FieldDescription: DataIds: 'SOLEXT ' DataIndexIds: 204 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: Apparent altitude of the sun's top edge FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: 0.30 km FieldDescription: DataIds: 'APPTOPY ' DataIndexIds: 205 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: Elapsed time since start of event FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: seconds FieldResolution: 0.30 km FieldDescription: DataIds: 'TIMES ' DataIndexIds: 5 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: Position of the instrument boresight on solar disk FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians FieldResolution: 0.30 km FieldDescription: DataIds: 'FSSPOS ' DataIndexIds: 11 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: gimble elevation angles FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians FieldResolution: 0.30 km FieldDescription: DataIds: 'GIMBLE ' DataIndexIds: 202 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: Gimble zenith angles FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians FieldResolution: 0.30 km FieldDescription: DataIds: 'GIMBLZ ' DataIndexIds: 203 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: Spacecraft subtangent longitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: degrees FieldResolution: 0.30km FieldDescription: DataIds: 'SCLATS ' DataIndexIds: 207 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: Spacecraft subtangent longitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: degrees FieldResolution: 0.30 km FieldDescription: DataIds: 'SCLONS ' DataIndexIds: 208 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: spacecraft altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: 0.30 km FieldDescription: DataIds: 'SCALTS ' DataIndexIds: 223 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: Measured voltage from the brightest diode on the Fine Sun Sensor array. FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volts FieldResolution: 0.30 km FieldDescription: DataIds: 'VPEAK ' DataIndexIds: 224 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: Correction to the zenith angle derived from the measured voltage from the brightest diode on the Fine Sun Sensor array. FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: arcminutes FieldResolution: 0.30 km FieldDescription: DataIds: 'VPCOR ' DataIndexIds: 225 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: Spacecraft velocity relative to the sun FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km/s FieldResolution: 0.30 km FieldDescription: DataIds: 'LOSVELSUN ' DataIndexIds: 6 These correspond to 'APPTANALT '. >0 is increasing separation distance FieldRepresentation: REAL*4 FieldName: spacecraft velocity relative to the tangent point FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km/s FieldResolution: 0.30 km FieldDescription: DataIds: 'LOSVELATM ' DataIndexIds: 7 These correspond to 'APPTANALT '. >0 is increasing separation distance FieldRepresentation: REAL*4 FieldName: CO2 boresight position on the solar disk FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians from top edge FieldResolution: 0.30 km FieldDescription: DataIds: 'LINTCO2 ' DataIndexIds: 159 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: H2O boresight position on the solar disk FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians from top edge FieldResolution: 0.30 km FieldDescription: DataIds: 'LINTH2O ' DataIndexIds: 160 These correspond to 'APPTANALT ' measured from top edge of sun. FieldRepresentation: REAL*4 FieldName: NO2 boresight position on the solar disk FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians from top edge FieldResolution: 0.30 km FieldDescription: DataIds: 'LINTNO2 ' DataIndexIds: 161 These correspond to 'APPTANALT ' measured from top edge of sun. FieldRepresentation: REAL*4 FieldName: O3 boresight position on the solar disk FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians from top edge FieldResolution: 0.30 km FieldDescription: DataIds: 'LINTO3 ' DataIndexIds: 162 These correspond to 'APPTANALT ' measured from top edge of sun. FieldRepresentation: REAL*4 FieldName: CH4 boresight position on the solar disk FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 edge FieldUnits: radians FieldResolution: 0.30 km FieldDescription: DataIds: 'LINTCH4 ' DataIndexIds: 163 positive going down from top These correspond to 'APPTANALT ' measured from top edge of sun. FieldRepresentation: REAL*4 FieldName: CH4 DV boresight position on the solar disk FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians FieldResolution: 0.30 km FieldDescription: DataIds: 'LINTCHD ' DataIndexIds: 164 These correspond to 'APPTANALT ' measured from top edge of sun. FieldRepresentation: REAL*4 FieldName: HCL boresight position on the solar disk FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians FieldResolution: 0.30 km FieldDescription: DataIds: 'LINTHCL ' DataIndexIds: 165 These correspond to 'APPTANALT ' measured from top edge of sun. FieldRepresentation: REAL*4 FieldName: HCL DV boresight position FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians FieldResolution: 0.30 km FieldDescription: DataIds: 'LINTHCLD ' DataIndexIds: 166 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: NO boresight position FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians FieldResolution: 0.30 km FieldDescription: DataIds: 'LINTNO ' DataIndexIds: 167 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: NO DV boresight position FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians FieldResolution: 0.30 km FieldDescription: DataIds: 'LINTNOD ' DataIndexIds: 168 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: HF DV boresight position FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians FieldResolution: 0.30 km FieldDescription: DataIds: 'LINTHF ' DataIndexIds: 169 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: NO DV boresight position FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: radians FieldResolution: 0.30 km FieldDescription: DataIds: 'LINTHFDV ' DataIndexIds: 170 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: CO2 signal at each apparent altitude FieldNnemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volts FieldResolution: 0.30 km FieldRange: FieldDescription: DataCharacterIds: 'INTCO2 ' DataIndexIds: 12 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: H2O signal at each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volts FieldResolution: 0.30 km FieldDescription: DataIds: 'INTH2O ' DataIndexIds: 13 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: NO2 signal at each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volts FieldResolution: 0.30 km FieldDescription: DataIds: 'INTINO2 ' DataIndexIds: 14 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: O3 signal at each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volts FieldResolution: 0.30 km FieldDescription: DataIds: 'INTO3 ' DataIndexIds: 15 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: CH4 V signal at each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volts FieldResolution: 0.30 km FieldDescription: DataIds: 'INTCH4 ' DataIndexIds: 16 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: CH4 difference signal at each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volts FieldResolution: 0.30 km FieldDescription: DataIds: 'INTDCH4 ' DataIndexIds: 17 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: HCL V signal at each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volts FieldResolution: 0.30 km FieldDescription: DataIds: 'INTHCL ' DataIndexIds: 18 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: HCL difference signal at each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volts FieldResolution: 0.30 km FieldDescription: DataIds: 'INTDHCL ' DataIndexIds: 19 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: NO V signal at each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volts FieldResolution: 0.30 km FieldDescription: DataIds: 'INTNO ' DataIndexIds: 20 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: NO difference signal at each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volts FieldResolution: 0.30 km FieldDescription: DataIds: 'INTDNO ' DataIndexIds: 21 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: HF difference signal at each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volts FieldResolution: 0.30 km FieldDescription: DataIds: 'INTHF ' DataIndexIds: 22 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: HF difference signal at each apparent altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volts FieldResolution: 0.30 km FieldDescription: DataIds: 'INTDHF ' DataIndexIds: 23 These correspond to 'APPTANALT '. FieldRepresentation: REAL*4 FieldName: SMTON FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: NA FieldResolution: NA FieldDescription: DataIds: 'SMTON ' DataIndexIds: 155 Filtered refers to smoothing which is applied whenever the measured noise/signal is above SMTP 1 if channel is filtered FieldRepresentation: REAL*4 FieldName: noise reduction factor for channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: NA FieldResolution: NA FieldDescription: DataIds: 'SMTF ' DataIndexIds: 156 There is one value for each of the 12 channels. Noise reduction factor refers the desired noise reduction. It determines the number of points in the moving average. FieldRepresentation: REAL*4 FieldName: noise/signal desired for channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: NA FieldResolution: NA FieldDescription: DataIds: 'SMTP ' DataIndexIds: 157 There is one value for each of the 12 channels. Noise/signal threshold which below which signals are smoothed. FieldRepresentation: REAL*4 FieldName: smoothing for channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: Smoothing result for each channel. FieldResolution: NA FieldDescription: DataIds: 'IFILT ' DataIndexIds: 158 There is one value for each of the 12 channels. 1 if smoothing was successful, 0 if not. FieldRepresentation: REAL*4 FieldName: Unconvolved normalized CO2V solar limb darkening curve FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: Normalized to 1.0 FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'LDCO2 ' DataIndexIds: 24 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. FieldRepresentation: REAL*4 FieldName: Unconvolved normalized H2O solar limb darkening curve FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: Normalized to 1.0 FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'LDH2O ' DataIndexIds: 25 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. FieldRepresentation: REAL*4 FieldName: Unconvolved normalized NO2V solar limb darkening curve FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: Normalized to 1.0 FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'LDNO2 ' DataIndexIds: 26 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. FieldRepresentation: REAL*4 FieldName: Unconvolved normalized O3V solar limb darkening curve FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: Normalized to 1.0 FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'LDO3 ' DataIndexIds: 27 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. FieldRepresentation: REAL*4 FieldName: Unconvolved normalized CH4V solar limb darkening curve FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: Normalized to 1.0 FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'LDCH4 ' DataIndexIds: 28 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. FieldRepresentation: REAL*4 FieldName: Unconvolved normalized HCLV solar limb darkening curve FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: Normalized to 1.0 FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'LDHCL ' DataIndexIds: 29 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. FieldRepresentation: REAL*4 FieldName: Unconvolved normalized NOV solar limb darkening curve FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: Normalized to 1.0 FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'LDNO ' DataIndexIds: 30 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. FieldRepresentation: REAL*4 FieldName: Unconvolved normalized HF Voltage solar limb darkening curve FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: Normalized to 1.0 FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'LDHF ' DataIndexIds: 31 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. FieldRepresentation: REAL*4 FieldName: Unconvolved normalized CH4DV solar limb darkening curve FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: Volts FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'LDDCH4 ' DataIndexIds: 173 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. FieldRepresentation: REAL*4 FieldName: Unconvolved normalized HCLDV solar limb darkening curve FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: Volts FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'LDDHCL ' DataIndexIds: 174 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. FieldRepresentation: REAL*4 FieldName: Unconvolved normalized NODV solar limb darkening curve FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: Volts FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'LDDNO ' DataIndexIds: 175 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. FieldRepresentation: REAL*4 FieldName: Unconvolved normalized HFDV solar limb darkening curve FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: Volts FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'LDDHF ' DataIndexIds: 176 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. FieldRepresentation: REAL*4 FieldName: Residual difference limb darkening curve CO2V FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: normalized FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'DLDCO2' DataIndexIds: 177 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. This is the difference between the HALOE measured solar scan and the unconvolved normalized solar limb darkening curve convolved with the HALOE system response, and gives an indication of the accuracy of the unconvolved solar limb darkening curve estimate. FieldRepresentation: REAL*4 FieldName: Residual difference limb darkening curve H2OV FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: normalized FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'DLDH2O' DataIndexIds: 178 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. This is the difference between the HALOE measured solar scan and the unconvolved normalized solar limb darkening curve convolved with the HALOE system response, and gives an indication of the accuracy of the unconvolved solar limb darkening curve estimate. FieldRepresentation: REAL*4 FieldName: Residual difference limb darkening curve NO2V FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: normalized FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'DLDNO2' DataIndexIds: 179 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. This is the difference between the HALOE measured solar scan and the unconvolved normalized solar limb darkening curve convolved with the HALOE system response, and gives an indication of the accuracy of the unconvolved solar limb darkening curve estimate. FieldRepresentation: REAL*4 FieldName: Residual difference limb darkening curve O3V FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: normalized FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'DLDO3' DataIndexIds: 180 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. This is the difference between the HALOE measured solar scan and the unconvolved normalized solar limb darkening curve convolved with the HALOE system response, and gives an indication of the accuracy of the unconvolved solar limb darkening curve estimate. FieldRepresentation: REAL*4 FieldName: Residual difference limb darkening curve CH4V FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: normalized FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'DLDCH4' DataIndexIds: 181 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. This is the difference between the HALOE measured solar scan and the unconvolved normalized solar limb darkening curve convolved with the HALOE system response, and gives an indication of the accuracy of the unconvolved solar limb darkening curve estimate. FieldRepresentation: REAL*4 FieldName: Residual difference limb darkening curve CH4DV FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: normalized FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'DLDCH4D ' DataIndexIds: 182 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. This is the difference between the HALOE measured solar scan and the unconvolved normalized solar limb darkening curve convolved with the HALOE system response, and gives an indication of the accuracy of the unconvolved solar limb darkening curve estimate. FieldRepresentation: REAL*4 FieldName: Residual difference limb darkening curve HCLV FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: normalized FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'DLDHCL ' DataIndexIds: 183 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. This is the difference between the HALOE measured solar scan and the unconvolved normalized solar limb darkening curve convolved with the HALOE system response, and gives an indication of the accuracy of the unconvolved solar limb darkening curve estimate. FieldRepresentation: REAL*4 FieldName: Residual difference limb darkening curve HCLDV FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: normalized FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'DLDHCLD ' DataIndexIds: 184 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. This is the difference between the HALOE measured solar scan and the unconvolved normalized solar limb darkening curve convolved with the HALOE system response, and gives an indication of the accuracy of the unconvolved solar limb darkening curve estimate. FieldRepresentation: REAL*4 FieldName: Residual difference limb darkening curve NOV FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: normalized FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'DLDNO ' DataIndexIds: 185 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. This is the difference between the HALOE measured solar scan and the unconvolved normalized solar limb darkening curve convolved with the HALOE system response, and gives an indication of the accuracy of the unconvolved solar limb darkening curve estimate. FieldRepresentation: REAL*4 FieldName: Residual difference limb darkening curve NODV FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: normalized FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'DLDNOD ' DataIndexIds: 186 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. This is the difference between the HALOE measured solar scan and the unconvolved normalized solar limb darkening curve convolved with the HALOE system response, and gives an indication of the accuracy of the unconvolved solar limb darkening curve estimate. FieldRepresentation: REAL*4 FieldName: Residual difference limb darkening curve HF Voltage FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: normalized FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'DLDHF ' DataIndexIds: 187 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. This is the difference between the HALOE measured solar scan and the unconvolved normalized solar limb darkening curve convolved with the HALOE system response, and gives an indication of the accuracy of the unconvolved solar limb darkening curve estimate. FieldRepresentation: REAL*4 FieldName: Residual difference limb darkening curve HFDV FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: normalized FieldResolution: 0.2 arcmin ( 5.81E-5 radians ) FieldDescription: DataIds: 'DLDHHFD ' DataIndexIds: 188 200 data points ranging from -4.0 arcmin to +36.0 arcmin relative to the top edge of the sun. This is the difference between the HALOE measured solar scan and the unconvolved normalized solar limb darkening curve convolved with the HALOE system response, and gives an indication of the accuracy of the unconvolved solar limb darkening curve estimate. FieldRepresentation: REAL*4 FieldName: RMS Error for each channel of the DLDXXX array FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: normalized to peak value of LDXXX array FieldResolution: NA FieldDescription: DataIds: 'ELD ' DataIndexIds: 171 The root mean squared of the DLDXXX array, used as a threshold to test accuracy of the solar limb darkening curve estimate. FieldRepresentation: REAL*4 FieldName: Max Error for each channel of the DLDXXX array FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: normalized to peak value of LDXXX array FieldResolution: NA FieldDescription: DataIds: 'EMLD ' DataIndexIds: 172 Indicates the maximum deviation from the expected solar limb darkening curve. FieldRepresentation: REAL*4 FieldName: sunspot residual in noise units for CO2 channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: noise units FieldResolution: NA FieldDescription: DataIds: 'SPOTCO2 ' DataIndexIds: 189 A theoretical solar limb darkening curve is point-by- point from the measured solar limb darkening curve. The residual is then normalized by the noise values for each channel. This residual is then the times noise array of any deviation from the expected solar limb darkening curve due to sunspots. FieldRepresentation: REAL*4 FieldName: sunspot residual in noise units for H2O channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: noise units FieldResolution: NA FieldDescription: DataIds: 'SPOTH2O ' DataIndexIds: 190 A theoretical solar limb darkening curve is point-by- point from the measured solar limb darkening curve. The residual is then normalized by the noise values for each channel. This residual is then the times noise array of any deviation from the expected solar limb darkening curve due to sunspots. FieldRepresentation: REAL*4 FieldName: sunspot residual in noise units for NO2 channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: noise units FieldResolution: NA FieldDescription: DataIds: 'SPOTNO2 ' DataIndexIds: 191 A theoretical solar limb darkening curve is point-by- point from the measured solar limb darkening curve. The residual is then normalized by the noise values for each channel. This residual is then the times noise array of any deviation from the expected solar limb darkening curve due to sunspots. FieldRepresentation: REAL*4 FieldName: sunspot residual in noise units for O3 channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: noise units FieldResolution: NA FieldDescription: DataIds: 'SPOTO3 ' DataIndexIds: 192 A theoretical solar limb darkening curve is point-by- point from the measured solar limb darkening curve. The residual is then normalized by the noise values for each channel. This residual is then the times noise array of any deviation from the expected solar limb darkening curve due to sunspots. FieldRepresentation: REAL*4 FieldName: sunspot residual in noise units for CH4 channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: noise units FieldResolution: NA FieldDescription: DataIds: 'SPOTCH4 ' DataIndexIds: 193 A theoretical solar limb darkening curve is point-by- point from the measured solar limb darkening curve. The residual is then normalized by the noise values for each channel. This residual is then the times noise array of any deviation from the expected solar limb darkening curve due to sunspots. FieldRepresentation: REAL*4 FieldName: sunspot residual in noise units for CH4DV channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: noise units FieldResolution: NA FieldDescription: DataIds: 'SPOTCH4D ' DataIndexIds: 194 A theoretical solar limb darkening curve is point-by- point from the measured solar limb darkening curve. The residual is then normalized by the noise values for each channel. This residual is then the times noise array of any deviation from the expected solar limb darkening curve due to sunspots. FieldRepresentation: REAL*4 FieldName: sunspot residual in noise units for HCL channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: noise units FieldResolution: NA FieldDescription: DataIds: 'SPOTHCL ' DataIndexIds: 195 A theoretical solar limb darkening curve is point-by- point from the measured solar limb darkening curve. The residual is then normalized by the noise values for each channel. This residual is then the times noise array of any deviation from the expected solar limb darkening curve due to sunspots. FieldRepresentation: REAL*4 FieldName: sunspot residual in noise units for HCLDV channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: noise units FieldResolution: NA FieldDescription: DataIds: 'SPOTHCLD ' DataIndexIds: 196 A theoretical solar limb darkening curve is point-by- point from the measured solar limb darkening curve. The residual is then normalized by the noise values for each channel. This residual is then the times noise array of any deviation from the expected solar limb darkening curve due to sunspots. FieldRepresentation: REAL*4 FieldName: sunspot residual in noise units for NO channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: noise units FieldResolution: NA FieldDescription: DataIds: 'SPOTNO ' DataIndexIds: 197 A theoretical solar limb darkening curve is point-by- point from the measured solar limb darkening curve. The residual is then normalized by the noise values for each channel. This residual is then the times noise array of any deviation from the expected solar limb darkening curve due to sunspots. FieldRepresentation: REAL*4 FieldName: sunspot residual in noise units for NODV channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: noise units FieldResolution: NA FieldDescription: DataIds: 'SPOTNOD ' DataIndexIds: 198 A theoretical solar limb darkening curve is point-by- point from the measured solar limb darkening curve. The residual is then normalized by the noise values for each channel. This residual is then the times noise array of any deviation from the expected solar limb darkening curve due to sunspots. FieldRepresentation: REAL*4 FieldName: sunspot residual in noise units for HF channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: noise units FieldResolution: NA FieldDescription: DataIds: 'SPOTHF ' DataIndexIds: 199 A theoretical solar limb darkening curve is point-by- point from the measured solar limb darkening curve. The residual is then normalized by the noise values for each channel. This residual is then the times noise array of any deviation from the expected solar limb darkening curve due to sunspots. FieldRepresentation: REAL*4 FieldName: sunspot residual in noise units for HFDV channel FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: noise units FieldResolution: NA FieldDescription: DataIds: 'SPOTHFD ' DataIndexIds: 200 A theoretical solar limb darkening curve is point-by- point from the measured solar limb darkening curve. The residual is then normalized by the noise values for each channel. This residual is then the times noise array of any deviation from the expected solar limb darkening curve due to sunspots. FieldRepresentation: REAL*4 FieldName: Off-sun offset for all channels ( 12 values ) FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: Volts FieldResolution: NA FieldDescription: DataIds: 'OFFSUN ' DataIndexIds: 139 A value for each channel in the order CO2, H2O, NO2, O3, CH4, DCH4, HCL, DHCL, NO, DNO, HF, DHF FieldRepresentation: REAL*4 FieldName: CO2 (pressure/temperature) retrieval: pressure FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: 1.5 km FieldDescription: DataIds: 'PRCO2 ' DataIndexIds: 32 FieldRepresentation: REAL*4 FieldName: CO2 (pressure/temperature) retrieval: altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: 1.5 km FieldDescription: DataIds: 'ALTCO2 ' DataIndexIds: 33 FieldRepresentation: REAL*4 FieldName: CO2 (pressure/temperature) retrieval: temperature FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: K FieldResolution: 1.5 km FieldDescription: DataIds: 'TEMPCO2 ' DataIndexIds: 34 FieldRepresentation: REAL*4 FieldName: CO2 (pressure/temperature) retrieval: CO2 mixing ratio FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 1.5 km FieldDescription: DataIds: 'XMIXCO2 ' DataIndexIds: 35 CO2 mixing ratio is a constant 350 ppm FieldRepresentation: REAL*4 FieldName: CO2 (pressure/temperature) retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: K FieldResolution: 1.5 km FieldDescription: DataIds: 'QUALCO2 ' DataIndexIds: 36 standard deviation in degrees K FieldRepresentation: REAL*4 FieldName: CO2 (pressure/temperature) retrieval: retrieval flag FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 1.5 km FieldDescription: DataIds: 'RFLGCO2 ' DataIndexIds: 128 This number is an indicator of the status of the retrieval. The code is described elsewhere. FieldRepresentation: REAL*4 FieldName: CO2 (pressure/temperature) retrieval: aerosol transmission FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 1.5 km FieldDescription: DataIds: 'ATRANCO2 ' DataIndexIds: 37 aerosols are not included in the pressure/temperature retrieval FieldRepresentation: REAL*4 FieldName: CO2 (pressure/temperature) retrieval: aerosol extinction FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 1.5 km FieldDescription: DataIds: 'AEXCO2 ' DataIndexIds: 38 aerosols are not included in the pressure/temperature retrieval FieldRepresentation: REAL*4 FieldName: CO2 (pressure/temperature) retrieval: CO2 column sum FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: molec/sq.cm FieldResolution: 1.5 km FieldDescription: DataIds: 'CO2 CS ' DataIndexIds: 39 FieldRepresentation: REAL*4 FieldName: CO2 (pressure/temperature) retrieval: refraction factor FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 1.5 km FieldDescription: DataIds: 'RF CO2 ' DataIndexIds: 140 This number can be divided into the normalized HALOE V signal to get a number that approximates transmission. FieldRepresentation: REAL*4 FieldName: H2O retrieval: pressure FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: 0.6 km FieldDescription: DataIds: 'PRH2O ' DataIndexIds: 40 This is the pressure profile used in the retrieval FieldRepresentation: REAL*4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . H2O Group FieldName: H2O retrieval: altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: 0.6 km FieldDescription: DataIds: 'ALTH2O ' DataIndexIds: 41 This is the altitude profile used in the retrieval FieldRepresentation: REAL*4 FieldName: H2O retrieval: temperature FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: degrees K FieldResolution: 0.6 km FieldDescription: DataIds: 'TEMPH2O ' DataIndexIds: 42 This is the temperature profile used in the retrieval FieldRepresentation: REAL*4 FieldName: H2O retrieval: H2O volume mixing ratio FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 0.6 km FieldDescription: DataIds: 'XMIXH2O ' DataIndexIds: 43 Retrieved H2O mixing ratio FieldRepresentation: REAL*4 FieldName: H2O retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 0.6 km FieldDescription: DataIds: 'QUALH2O ' DataIndexIds: 44 standard deviation in volume mixing ratio FieldRepresentation: REAL*4 FieldName: H2O retrieval: H2O retrieval flag FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 0.6 km FieldDescription: DataIds: 'RFLGH2O ' DataIndexIds: 129 This number is an indicator of the status of the retrieval. The code is described elsewhere. FieldRepresentation: REAL*4 FieldName: H2O retrieval: aerosol transmission FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 0.6 km FieldDescription: DataIds: 'ATRANH2O ' DataIndexIds: 45 aerosols are extrapolated from the NO channel aerosol retrieval and modified for use in the H2O channel retrieval FieldRepresentation: REAL*4 FieldName: H2O retrieval: aerosol extinction FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 0.6 km FieldDescription: DataIds: 'AEXH2O ' DataIndexIds: 46 aerosols are extrapolated from the NO channel aerosol retrieval and modified for use in the H2O channel retrieval FieldRepresentation: REAL*4 FieldName: H2O retrieval: H2O column sum FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: molec/sq.cm FieldResolution: 0.6 km FieldDescription: DataIds: 'H2O CS ' DataIndexIds: 138 FieldRepresentation: REAL*4 FieldName: H2O retrieval: refraction factor FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 0.6 km FieldDescription: DataIds: 'RF H2O ' DataIndexIds: 141 This number can be divided into the normalized HALOE V signal to get a number that approximates transmission. FieldRepresentation: REAL*4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NO2 Group FieldName: NO2 retrieval: pressure FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: 0.3 km FieldDescription: DataIds: 'PRNO2 ' DataIndexIds: 48 This is the pressure profile used in the retrieval FieldRepresentation: REAL*4 FieldName: NO2 retrieval: altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: 0.3 km FieldDescription: DataIds: 'ALTNO2 ' DataIndexIds: 49 This is the altitude profile used in the retrieval FieldRepresentation: REAL*4 FieldName: NO2 retrieval: temperature FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: degrees K FieldResolution: 0.3 km FieldDescription: DataIds: 'TEMPNO2 ' DataIndexIds: 50 This is the temperature profile used in the retrieval FieldRepresentation: REAL*4 FieldName: NO2 retrieval: NO2 volume mixing ratio FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 0.3 km FieldDescription: DataIds: 'XMIXNO2 ' DataIndexIds: 51 Retrieved NO2 mixing ratio FieldRepresentation: REAL*4 FieldName: NO2 retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 0.3 km FieldDescription: DataIds: 'QUALNO2 ' DataIndexIds: 52 standard deviation in volume mixing ratio FieldRepresentation: REAL*4 FieldName: NO2 retrieval: NO2 retrieval flag FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 0.3 km FieldDescription: DataIds: 'RFLGNO2 ' DataIndexIds: 130 This number is an indicator of the status of the retrieval. The code is described elsewhere. FieldRepresentation: REAL*4 FieldName: NO2 retrieval: aerosol transmission FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 0.3 km FieldDescription: DataIds: 'ATRANNO2 ' DataIndexIds: 53 aerosols are extrapolated from the NO channel aerosol retrieval and modified for use in the NO2 channel retrieval FieldRepresentation: REAL*4 FieldName: NO2 retrieval: aerosol extinction FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 0.3 km FieldDescription: DataIds: 'AEXNO2 ' DataIndexIds: 54 aerosols are extrapolated from the NO channel aerosol retrieval and modified for use in the NO2 channel retrieval FieldRepresentation: REAL*4 FieldName: NO2 retrieval: NO2 column sum FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: molec/sq.cm FieldResolution: 0.3 km FieldDescription: DataIds: 'NO2 CS ' DataIndexIds: 55 FieldRepresentation: REAL*4 FieldName: NO2 retrieval: refraction factor FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 0.3 km FieldDescription: DataIds: 'RF NO2 ' DataIndexIds: 142 This number can be divided into the normalized HALOE V signal to get a number that approximates transmission. FieldRepresentation: REAL*4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O3 Group FieldName: O3 retrieval: pressure FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: 0.3 km FieldDescription: DataIds: 'PRO3 ' DataIndexIds: 56 This is the pressure profile used in the retrieval FieldRepresentation: REAL*4 FieldName: O3 retrieval: altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: 0.3 km FieldDescription: DataIds: 'ALTO3 ' DataIndexIds: 57 This is the altitude profile used in the retrieval FieldRepresentation: REAL*4 FieldName: O3 retrieval: temperature FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: degrees K FieldResolution: 0.3 km FieldDescription: DataIds: 'TEMPO3 ' DataIndexIds: 58 This is the temperature profile used in the retrieval FieldRepresentation: REAL*4 FieldName: O3 retrieval: O3 volume mixing ratio FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 0.3 km FieldDescription: DataIds: 'XMIXO3 ' DataIndexIds: 59 Retrieved O3 mixing ratio FieldRepresentation: REAL*4 FieldName: O3 retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 0.3 km FieldDescription: DataIds: 'QUALO3 ' DataIndexIds: 60 standard deviation in volume mixing ratio FieldRepresentation: REAL*4 FieldName: O3 retrieval: O3 retrieval flag FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 0.3 km FieldDescription: DataIds: 'RFLGO3 ' DataIndexIds: 131 This number is an indicator of the status of the retrieval. The code is described elsewhere. FieldRepresentation: REAL*4 FieldName: O3 retrieval: aerosol transmission FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 0.3 km FieldDescription: DataIds: 'ATRANO3 ' DataIndexIds: 61 aerosols are extrapolated from the NO channel aerosol retrieval and modified for use in the O3 channel retrieval FieldRepresentation: REAL*4 FieldName: O3 retrieval: aerosol extinction FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 0.3 km FieldDescription: DataIds: 'AEXO3 ' DataIndexIds: 62 aerosols are extrapolated from the NO channel aerosol retrieval and modified for use in the O3 channel retrieval FieldRepresentation: REAL*4 FieldName: O3 retrieval: O3 column sum FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: molec/sq.cm FieldResolution: 0.3 km FieldDescription: DataIds: 'O3 CS ' DataIndexIds: 63 FieldRepresentation: REAL*4 FieldName: O3 retrieval: refraction factor FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 0.3 km FieldDescription: DataIds: 'RF O3 ' DataIndexIds: 143 This number can be divided into the normalized HALOE V signal to get a number that approximates transmission. FieldRepresentation: REAL*4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NO Group FieldName: NO retrieval: pressure FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: 5.0 & 3.0 km FieldDescription: DataIds: 'PRNO ' DataIndexIds: 64 This is the pressure profile used in the retrieval 3 km when altitude less than 75 km 5 km when altitude greater than 75 km FieldRepresentation: REAL*4 FieldName: NO retrieval: altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: 5.0 & 3.0 km FieldDescription: DataIds: 'ALTNO ' DataIndexIds: 65 This is the altitude profile used in the retrieval FieldRepresentation: REAL*4 FieldName: NO retrieval: temperature FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: degrees K FieldResolution: 5.0 & 3.0 km FieldDescription: DataIds: 'TEMPNO ' DataIndexIds: 66 This is the temperature profile used in the retrieval FieldRepresentation: REAL*4 FieldName: NO retrieval: NO volume mixing ratio FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 5.0 & 3.0 km FieldDescription: DataIds: 'XMIXNO ' DataIndexIds: 67 Retrieved NO mixing ratio FieldRepresentation: REAL*4 FieldName: NO retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 5.0 & 3.0 km FieldDescription: DataIds: 'QUALNO ' DataIndexIds: 68 standard deviation in volume mixing ratio FieldRepresentation: REAL*4 FieldName: NO retrieval: NO retrieval flag FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 5.0 & 3.0 km FieldDescription: DataIds: 'RFLGNO ' DataIndexIds: 132 This number is an indicator of the status of the retrieval. The code is described elsewhere. FieldRepresentation: REAL*4 FieldName: NO retrieval: aerosol transmission FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 5.0 & 3.0 km FieldDescription: DataIds: 'ATRANNO ' DataIndexIds: 69 aerosols are from the NO channel aerosol retrieval FieldRepresentation: REAL*4 FieldName: NO retrieval: aerosol extinction FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 5.0 & 3.0 km FieldDescription: DataIds: 'AEXNO ' DataIndexIds: 70 aerosols are from the NO channel aerosol retrieval FieldRepresentation: REAL*4 FieldName: NO retrieval: NO column sum FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: molec/sq.cm FieldResolution: 5.0 & 3.0 km FieldDescription: DataIds: 'NO CS ' DataIndexIds: 71 FieldRepresentation: REAL*4 FieldName: NO retrieval: refraction factor FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 5.0 & 3.0 km FieldDescription: DataIds: 'RF NO ' DataIndexIds: 144 This number can be divided into the normalized HALOE V signal to get a number that approximates transmission. FieldRepresentation: REAL*4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CH4 Group FieldName: CH4 retrieval: pressure FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: 3.0 km FieldDescription: DataIds: 'PRDCH4 ' DataIndexIds: 72 This is the pressure profile used in the retrieval FieldRepresentation: REAL*4 FieldName: CH4 retrieval: altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: 3.0 km FieldDescription: DataIds: 'ALTDCH4 ' DataIndexIds: 73 This is the altitude profile used in the retrieval FieldRepresentation: REAL*4 FieldName: CH4 retrieval: temperature FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: degrees K FieldResolution: 3.0 km FieldDescription: DataIds: 'TEMPDCH4 ' DataIndexIds: 74 This is the temperature profile used in the retrieval FieldRepresentation: REAL*4 FieldName: CH4 retrieval: CH4 volume mixing ratio FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 3.0 km FieldDescription: DataIds: 'XMIXDCH4 ' DataIndexIds: 75 Retrieved CH4 channel mixing ratio FieldRepresentation: REAL*4 FieldName: CH4 retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 3.0 km FieldDescription: DataIds: 'QUALDCH4 ' DataIndexIds: 76 standard deviation in volume mixing ratio FieldRepresentation: REAL*4 FieldName: CH4 retrieval: CH4 retrieval flag FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 3.0 km FieldDescription: DataIds: 'RFLGDCH4 ' DataIndexIds: 133 This number is an indicator of the status of the retrieval. The code is described elsewhere FieldRepresentation: REAL*4 FieldName: CH4 retrieval: aerosol transmission FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 3.0 km FieldDescription: DataIds: 'ATRANDCH4 ' DataIndexIds: 77 aerosols are extrapolated from the NO channel aerosol retrieval FieldRepresentation: REAL*4 FieldName: DCH4 retrieval: aerosol extinction FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 3.0 km FieldDescription: DataIds: 'AEXDCH4 ' DataIndexIds: 78 aerosols are extrapolated from the NO channel aerosol retrieval FieldRepresentation: REAL*4 FieldName: CH4 retrieval: CH4 column sum FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: molec/sq.cm FieldResolution: 3.0 km FieldDescription: DataIds: 'DCH4 CS ' DataIndexIds: 79 FieldRepresentation: REAL*4 FieldName: CH4 retrieval: refraction factor FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 3.0 km FieldDescription: DataIds: 'RF DCH4 ' DataIndexIds: 145 This number can be divided into the normalized HALOE V signal to get a number that approximates transmission. FieldRepresentation: REAL*4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CH4 (using HCl v) Group FieldName: CH4 ( using HCL V ) retrieval: pressure FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: NA FieldDescription: DataIds: 'PRCH4HCL ' DataIndexIds: 80 This is the pressure profile used in the retrieval. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using HCL V ) retrieval: altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: NA FieldDescription: DataIds: 'ALTCH4HCL ' DataIndexIds: 81 This is the altitude profile used in the retrieval. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using HCL V ) retrieval: temperature FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: degrees K FieldResolution: NA FieldDescription: DataIds: 'TEMPCH4HCL ' DataIndexIds: 82 This is the temperature profile used in the retrieval. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using HCL V )retrieval: CH4 volume mixing ratio FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: NA FieldDescription: DataIds: 'XMIXCH4HCL' DataIndexIds: 83 Retrieved CH4 mixing ratio. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using HCL V ) retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: NA FieldDescription: DataIds: 'QUALCH4HCL' DataIndexIds: 84 standard deviation in volume mixing ratio. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using HCL V ) retrieval: retrieval flag FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: NA FieldDescription: DataIds: 'RFLGCH4HCL' DataIndexIds: 134 This number is an indicator of the status of the retrieval. The code is described elsewhere. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using HCL V ) retrieval: aerosol transmission FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: NA FieldDescription: DataIds: 'ATRANCH4HCL' DataIndexIds: 85 The source of the aerosol correction will be determined later. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using HCL V ) retrieval: aerosol extinction FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: FieldDescription: DataIds: 'AEXCH4HCL' DataIndexIds: 86 The source of the aerosol correction will be determined later. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using HCL V ) retrieval: CH4 column sum FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: molec/sq.cm FieldResolution: NA FieldDescription: DataIds: 'CH4HCL CS' DataIndexIds: 87 This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using HCL V ) retrieval: refraction factor FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: NA FieldDescription: DataIds: 'RF CH4HCL' DataIndexIds: 146 This number can be divided into the normalized HALOE V signal to get a number that approximates transmission. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CH4 Group using CH4 signal FieldName: CH4 ( using CH4 V ) retrieval: pressure FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: NA FieldDescription: DataIds: 'PRCH4 ' DataIndexIds: 88 This is the pressure profile used in the retrieval. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using CH4 V ) retrieval: altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: NA FieldDescription: DataIds: 'ALTCH4 ' DataIndexIds: 89 This is the altitude profile used in the retrieval This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using CH4 V ) retrieval: temperature FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: degrees K FieldResolution: NA FieldDescription: DataIds: 'TEMPCH4 ' DataIndexIds: 90 This is the temperature profile used in the retrieval This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using CH4 V ) retrieval: CH4 volume mixing ratio FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: FieldDescription: DataIds: 'XMIXCH4 ' DataIndexIds: 91 Retrieved CH4 profile using the CH4 V signal. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using CH4 V ) retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: NA FieldDescription: DataIds: 'QUALCH4 ' DataIndexIds: 92 standard deviation in volume mixing ratio. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using CH4 V ) retrieval: CH4 retrieval flag FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: NA FieldDescription: DataIds: 'RFLGCH4 ' DataIndexIds: 135 This number is an indicator of the status of the retrieval. The code is described elsewhere. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using CH4 V ) retrieval: aerosol transmission FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: NA FieldDescription: DataIds: 'ATRANCH4 ' DataIndexIds: 93 The source of the aerosol correction will be determined later. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using CH4 V ) retrieval: aerosol extinction FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: NA FieldDescription: DataIds: 'AEXCH4 ' DataIndexIds: 94 The source of the aerosol correction will be determined later. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using CH4 V ) retrieval: CH4 column sum FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: molec/sq.cm FieldResolution: NA FieldDescription: DataIds: 'CH4 CS ' DataIndexIds: 95 This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 FieldName: CH4 ( using CH4 V ) retrieval: refraction factor FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: NA FieldDescription: DataIds: 'RF CH4 ' DataIndexIds: 147 This number can be divided into the normalized HALOE V signal to get a number that approximates transmission. This retrieval is not done in this version of the software, and there is no DataId only a DataIndexId in the level 2 file. FieldRepresentation: REAL*4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CH4 Merged Group FieldName: CH4 ( merged ) retrieval: pressure FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: 0.3 km FieldDescription: DataIds: 'PRCH4M ' DataIndexIds: 96 This is the pressure profile for the merged CH4 profile. The CH4 merged profile is described below. FieldRepresentation: REAL*4 FieldName: CH4 ( merged ) retrieval: altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: 0.3 km FieldDescription: DataIds: 'ALTCH4M ' DataIndexIds: 97 This is the pressure profile for the merged CH4 profile. The CH4 merged profile is described below. FieldRepresentation: REAL*4 FieldName: CH4 ( merged ) retrieval: temperature FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: degrees K FieldResolution: 0.3 km FieldDescription: DataIds: 'TEMPCH4M ' DataIndexIds: 98 This is the pressure profile for the merged CH4 profile. The CH4 merged profile is described below. below. FieldRepresentation: REAL*4 FieldName: CH4 ( merged ) retrieval: merged CH4 volume mixing ratio FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 0.3 km FieldDescription: DataIds: 'XMIXCH4M ' DataIndexIds: 99 Merged CH4 profile. Currently this profile consists of the DV retrieval ( index 75, character string XMIXDCH4 ) down to about 100 mb. Below 100 mb, the CH4 profile is a climatological value. FieldRepresentation: REAL*4 FieldName: CH4 ( merged ) retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 0.3 km FieldDescription: DataIds: 'QUALCH4M ' DataIndexIds: 100 There are no values for this parameter. FieldRepresentation: REAL*4 FieldName: CH4 ( merged ) retrieval: merged CH4 column sum FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: molec/sq.cm FieldResolution: 0.3 km FieldDescription: DataIds: 'CH4/MRG CS ' DataIndexIds: 101 FieldRepresentation: REAL*4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HCl Group FieldName: HCL retrieval: pressure FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: 3.0 km FieldDescription: DataIds: 'PRHCL ' DataIndexIds: 102 This is the pressure profile used in the retrieval FieldRepresentation: REAL*4 FieldName: HCL retrieval: altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: 3.0 km FieldDescription: DataIds: 'ALTHCL ' DataIndexIds: 103 This is the altitude profile used in the retrieval FieldRepresentation: REAL*4 FieldName: HCL retrieval: temperature FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: degrees K FieldResolution: 3.0 km FieldDescription: DataIds: 'TEMPHCL ' DataIndexIds: 104 This is the temperature profile used in the retrieval FieldRepresentation: REAL*4 FieldName: HCL retrieval: HCL volume mixing ratio FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 3.0 km FieldDescription: DataIds: 'XMIXHCL ' DataIndexIds: 105 Retrieved HCL mixing ratio FieldRepresentation: REAL*4 FieldName: HCL retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 3.0 km FieldDescription: DataIds: 'QUALHCL ' DataIndexIds: 106 standard deviation in volume mixing ratio FieldRepresentation: REAL*4 FieldName: HCL retrieval: HCL retrieval flag FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 3.0 km FieldDescription: DataIds: 'RFLGHCL ' DataIndexIds: 136 This number is an indicator of the status of the retrieval. The code is described elsewhere. FieldRepresentation: REAL*4 FieldName: HCL retrieval: aerosol transmission FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 3.0 km FieldDescription: DataIds: 'ATRANHCL ' DataIndexIds: 107 aerosols are extrapolated from the NO channel aerosol retrieval FieldRepresentation: REAL*4 FieldName: HCL retrieval: aerosol extinction FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 3.0 km FieldDescription: DataIds: 'AEXHCL ' DataIndexIds: 108 aerosols are extrapolated from the NO channel aerosol retrieval FieldRepresentation: REAL*4 FieldName: HCL retrieval: HCL column sum FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: molec/sq.cm FieldResolution: 3.0 km FieldDescription: DataIds: 'HCL CS ' DataIndexIds: 109 FieldRepresentation: REAL*4 FieldName: HCL retrieval: refraction factor FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 3.0 km FieldDescription: DataIds: 'RF HCL ' DataIndexIds: 148 This number can be divided into the normalized HALOE V signal to get a number that approximates transmission. FieldRepresentation: REAL*4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HF Group FieldName: HF retrieval: pressure FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: 3.0 km FieldDescription: DataIds: 'PRHF ' DataIndexIds: 110 This is the pressure profile used in the retrieval FieldRepresentation: REAL*4 FieldName: HF retrieval: altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: 3.0 km FieldDescription: DataIds: 'ALTHF ' DataIndexIds: 111 This is the altitude profile used in the retrieval FieldRepresentation: REAL*4 FieldName: HF retrieval: temperature FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: degrees K FieldResolution: 3.0 km FieldDescription: DataIds: 'TEMPHF ' DataIndexIds: 112 This is the temperature profile used in the retrieval FieldRepresentation: REAL*4 FieldName: HF retrieval: HF volume mixing ratio FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 3.0 km FieldDescription: DataIds: 'XMIXHF ' DataIndexIds: 113 Retrieved HF mixing ratio FieldRepresentation: REAL*4 FieldName: HF retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 3.0 km FieldDescription: DataIds: 'QUALHF ' DataIndexIds: 114 standard deviation in volume mixing ratio FieldRepresentation: REAL*4 FieldName: HF retrieval: HF retrieval flag FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 3.0 km FieldDescription: DataIds: 'RFLGHF ' DataIndexIds: 137 This number is an indicator of the status of the retrieval. The code is described elsewhere. FieldRepresentation: REAL*4 FieldName: HF retrieval: aerosol transmission FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 3.0 km FieldDescription: DataIds: 'ATRANHF ' DataIndexIds: 115 aerosols are extrapolated from the NO channel aerosol retrieval FieldRepresentation: REAL*4 FieldName: HF retrieval: aerosol extinction FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 3.0 km FieldDescription: DataIds: 'AEXHF ' DataIndexIds: 116 aerosols are extrapolated from the NO channel aerosol retrieval FieldRepresentation: REAL*4 FieldName: HF retrieval: HF column sum FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: molec/sq.cm FieldResolution: 3.0 km FieldDescription: DataIds: 'HF CS ' DataIndexIds: 117 FieldRepresentation: REAL*4 FieldName: HF retrieval: refraction factor FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: 3.0 km FieldDescription: DataIds: 'RF HF ' DataIndexIds: 149 This number can be divided into the normalized HALOE V signal to get a number that approximates transmission. FieldRepresentation: REAL*4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interfering Gas Group FieldName: Interfering gas profile: pressure FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: 0.3 km FieldDescription: DataIds: 'IGPR ' DataIndexIds: 118 This is the pressure profile for the interfering gas FieldRepresentation: REAL*4 FieldName: Interfering gas profile: altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: 0.3 km FieldDescription: DataIds: 'IGALT ' DataIndexIds: 119 This is the altitude profile for the interfering gas FieldRepresentation: REAL*4 FieldName: Interfering gas profile: temperature FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: degrees K FieldResolution: 0.3 km FieldDescription: DataIds: 'IGTEMP ' DataIndexIds: 120 This is the temperature profile for the interfering gas FieldRepresentation: REAL*4 FieldName: Interfering gas profile: N2O volume mixing ratio FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 0.3 km FieldDescription: DataIds: 'IGN2O ' DataIndexIds: 121 This is the climatological N2O profile used as an interferent in some channels FieldRepresentation: REAL*4 FieldName: Interfering gas profile: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: volume mixing ratio FieldResolution: 0.3 km FieldDescription: DataIds: 'QUALIG ' DataIndexIds: 122 There are no values for this parameter. FieldRepresentation: REAL*4 FieldName: Interfering gas profile: aerosol transmission FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: unitless FieldResolution: NA FieldDescription: DataIds: 'ATRAIG ' DataIndexIds: 123 There are no aerosol values for interfering species. FieldRepresentation: REAL*4 FieldName: Interfering gas profile: aerosol extinction FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 0.3 km FieldDescription: DataIds: 'AEXIG ' DataIndexIds: 124 There are no aerosol values for interfering species. FieldRepresentation: REAL*4 FieldName: Interfering gas profile: N2O column sum FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: molec/sq.cm FieldResolution: 0.3 km FieldDescription: DataIds: 'IG CS ' DataIndexIds: 125 FieldRepresentation: REAL*4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FieldName: Temperature spacing at 0.3 km FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: K FieldResolution: 0.30 km FieldDescription: DataIds: 'LV2TEMP ' DataIndexIds: 150 This is the merged temperature profile from which comes the temperature profile used in the mixing ratio and aerosol extinction retrievals. This consists of the retrieved temperature profile from approximately 35 km to 80 km. Above and below these altitudes, the level 1 profiles are weighted into the retrievals and are the temperature profiles. The altitude spacing is the level 1 spacing of 150.0 km to 3.0 km. FieldRepresentation: REAL*4 FieldName: Pressure profile spaced at 0.30 km FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: 0.30 km FieldDescription: DataIds: 'LV2PRES ' DataIndexIds: 151 This is the merged pressure profile corresponding to the LV2TEMP ( index 150 ) temperature profile. FieldRepresentation: REAL*4 FieldName: Aerosol retrieval: aerosol retrieval altitude FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: km FieldResolution: 0.30 km FieldDescription: DataIds: 'aero z ' DataIndexIds: 209 The aerosol retrievals are output on a standard grid. FieldRepresentation: REAL*4 FieldName: Aerosol retrieval: aerosol retrieval pressure FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: mb FieldResolution: 0.30 km FieldDescription: DataIds: 'aero p ' DataIndexIds: 210 Pressures corresponding to 'aero z '. FieldRepresentation: REAL*4 FieldName: Aerosol retrieval: aerosol retrieval temperature FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: K FieldResolution: 0.30 km FieldDescription: DataIds: 'aero t ' DataIndexIds: 211 Temperatures corresponding to 'aero z '. FieldRepresentation: REAL*4 FieldName: Aerosol retrieval: H2SO4 percentage by weight FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: percent FieldResolution: 0.30 km FieldDescription: DataIds: 'aero h2so4' DataIndexIds: 212 Output on 'aero z ' spacing. FieldRepresentation: REAL*4 FieldName: NO aerosol extinction ( 5.26 microns ) FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 0.30 km FieldDescription: DataIds: 'aExHi NO ' DataIndexIds: 213 FieldRepresentation: REAL*4 FieldName: NO aerosol retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 0.30 km FieldDescription: DataIds: 'aerStd ' DataIndexIds: 214 standard deviation in extinction FieldRepresentation: REAL*4 FieldName: CH4 aerosol extinction ( 3.46 microns ) FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 0.30 km FieldDescription: DataIds: 'aExHi CH4' DataIndexIds: 215 FieldRepresentation: REAL*4 FieldName: CH4 aerosol retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 0.30 km FieldDescription: DataIds: 'aerStd CH4' DataIndexIds: 216 standard deviation in extinction FieldRepresentation: REAL*4 FieldName: HCL aerosol extinction ( 3.40 microns ) FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 0.30 km FieldDescription: DataIds: 'aExHi HCl ' DataIndexIds: 217 FieldRepresentation: REAL*4 FieldName: HCL aerosol retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 0.30 km FieldDescription: DataIds: 'aerStd HCl' DataIndexIds: 218 standard deviation in extinction FieldRepresentation: REAL*4 FieldName: HF aerosol extinction ( 2.45 microns ) FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 0.30 km FieldDescription: DataIds: 'aExHi HF ' DataIndexIds: 219 FieldRepresentation: REAL*4 FieldName: HF aerosol retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 0.30 km FieldDescription: DataIds: 'aerStd HF' DataIndexIds: 220 standard deviation in extinction FieldRepresentation: REAL*4 FieldName: CO2 aerosol extinction ( 3.40 microns ) FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 0.30 km FieldDescription: DataIds: 'aExHi CO2' DataIndexIds: 221 standard deviation in extinction FieldRepresentation: REAL*4 FieldName: CO2 aerosol retrieval: quality profile FieldNemonic: RIN FieldSyntax: ARRAY, LENGTH EQUAL TO OR LESS THAN 491 FieldUnits: 1/km FieldResolution: 0.30 km FieldDescription: DataIds: 'aerStd CO2' DataIndexIds: 222 FieldRepresentation: REAL*4 retrieval flags - These integers give an indication of the general character of each retrieval point and are output for each retrieval except the aerosols. Each retrieval flag is composed of 2 numbers. The first number is 1...The output profile point was a true retrieval. 3...The output profile point is a constant above the first retrieval point. Ignore the standard deviations for points with a flag value of 3. The second number pertains to the manner in which the code checks for convergence in the retrieval of a given layer's mixing ratio or temperature. This second number is 0...no convergence problems 1...The difference between the last iteration's calculated signal and the current iteration's calculated signal was zero. The routine stopped and went on to next layer. 2...Calculated change in mixing ratio or temperature was so small that the calculated signal was likely going to be the same as in the previous iteration. This would result in a zero signal difference so the routine stopped and went on to the next layer. 3...The maximum number of iterations was reached. 4...The calculated signal was zero. The routine went on to the next layer. 9...The mixing ratios are set to a constant above the first retrieval point. The value of 9 indicates that the profile point is part of the constant values. The retrieval flag is the second number added to 10 times the first number. The following FORTRAN routines and include files can be used to build the HALOE level 2 reader for a VMS system. The command file to compile and link these codes is given at the end of this section. By commenting out the lines ending in !VAX and removing the comments from lines ending in !IBM you can convert this program to UNIX. PROGRAM READIT C C 6-MAR-92 KVH C 29-MAR-92 KVH Documented and tested with new level 2 file C 3-APR-92 KVH BUG fix on record 6 and 7 of summary C 7-APR-92 KVH Added subroutines to simplify program C C This is the initial cut at reading the new level 2 file structure. C This routine will be converted to a subroutine ASAP. C IMPLICIT NONE C EXTERNAL RWL1HD, ! Reads level 1&2 standard header & RL2SUM, ! Reads the summary section of the file & RL2DAT ! Reads the data section of the file C INCLUDE 'HAL_SRC:lv2par.inc' !VAX C INCLUDE 'lv2par.inc' !IBM C INTEGER LV2FG, ! Version number of level 2 file & NSIZHD ! Size of header in REAL*4 words INTEGER*4 NPR CHARACTER*10 CHFH ! Dummy string for reading data INTEGER*4 I, ! Dummy index & K, ! Dummy index & L, ! Dummy index & IP(201), ! Array of index values to be output & MM, ! Dummy index & NUM ! Number of values in IP to be read C with non-zero length LOGICAL ENDF, ! End of file flag (.TRUE. if eof) & FAIL ! True if read fails C INCLUDE 'lv1hd.inc' ! include file for stand head !IBM INCLUDE 'HAL_SRC:lv1hd.inc' ! Include file for stand head !VAX C INCLUDE 'lv2sum.inc' ! Include file for summary data !IBM INCLUDE 'HAL_SRC:lv2sum.inc'! Include file for summary data !VAX C INCLUDE 'l2dat.inc' !IBM INCLUDE 'HAL_SRC:l2dat.inc' !VAX CHARACTER*80 LV2FIL ! Name of level 2 file CHARACTER*1 PNT, ! 'Y' will cause print of level 2 header & ANS ! Dummy input or request to print C C --- Start execution of program C PRINT *, ' Input full name of level 2 file ' READ(*,'(A80)') LV2FIL OPEN(4,FILE=LV2FIL,STATUS= 'OLD',FORM= 'UNFORMATTED', !VAX & READONLY) !VAX C OPEN(4,FILE=LV2FIL,STATUS= 'OLD',FORM= 'UNFORMATTED') !IBM C PNT = 'Y' ! Comments always printed - this is for summary data C CALL RL2SUM( 4, PNT, LV2FG, NSIZHD, FAIL) PRINT *,'