PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = "2019-09-27 GMartinez, initial" RECORD_TYPE = STREAM OBJECT = DATA_SET DATA_SET_ID = "MSL-M-REMS-5-UVRDR-V1.0" OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = "MSL MARS ROVER ENV MONITORING STATION 5 UVRDR V1.0" DATA_SET_TERSE_DESC = "MSL Rover Environmental Monitoring Station UV fluxes corrected for dust deposition and inaccuracies in the original angular response calibration functions during the first 2000 sols." DATA_SET_COLLECTION_MEMBER_FLG = N DATA_OBJECT_TYPE = TABLE START_TIME = 2012-08-07T04:04:38.536 STOP_TIME = 2018-03-23T13:08:46.290 DATA_SET_RELEASE_DATE = 2019-10-04 PRODUCER_FULL_NAME = "GERMAN MARTINEZ AND ALVARO DE VICENTE-RETORTILLO" DETAILED_CATALOG_FLAG = N CITATION_DESC = "Martinez, G., Mars Science Laboratory Rover Environmental Monitoring Station RDR Data V1.0, MSL-M-REMS-5-UVRDR-V1.0, NASA Planetary Data System, 2019." ABSTRACT_DESC = "UV fluxes measured by the UV sensor of the Rover Environmental Monitoring Station (REMS) aboard the Mars Science Laboratory in physical units, with corrections and modeling." DATA_SET_DESC = " Data Set Overview ================= The REMS instrument has a UV sensor (UVS) that is measuring the UV radiation flux at the surface of Mars in six bands between 200 and 380 nm. Due to its location on the rover deck, the UVS has been exposed to dust deposition. In addition, inaccuracies in the original calibration function of the angular response of the UVS have led to discrepancies between measured and physically-consistent UV fluxes when the solar zenith angle (theta) relative to the rover frame is between 20 degrees and 55 degrees. The REMS UVRDR dataset contains UV fluxes corrected for both effects when theta < 55 degrees during the first 2000 sols of the mission. The corrections at this level have been applied either by models, by removing invalid data, or by selecting the most representative data (e.g. minimum of several sensors). All the original data can be found in the previous processing levels. Each data product contains 100 sols worth of activity, from sol 1 to 2000. This UV dataset is the highest processing level of UV data produced by the REMS team. Parameters ========== This data set includes the following information: - UV flux in units of W/m2 measured by each of the six UVS channels and the associated uncertainties, also in units of W/m2. Sampling is at 1Hz maximum, with a baseline operation of 5 minutes every hour. Additional measurements can be taken on an on-demand basis beyond those hourly observations. For these additional measurements, and besides tactical day to day conditions and resources, there is a general pattern that covers selected hours of the day built by the scientific team during operations. That pattern is shifted from sol to sol to cover the whole 24 hours after a few sols. Additionally, extended measurements can also be triggered automatically if event mode is activated, in which case the REMS computer will decide or not to continue measuring after the regular cadence, by comparing the previous measurements with the expected trend. The objective is to capture any ongoing transitory atmospheric event. Processing ========== Processing starts with the generation of the REMS EDRs. The REMS EDR data products are generated by the MIPL (Multimission Image Processing Laboratory) at JPL, under the OPGS, using the telemetry processing software called MSLEdrGen. This software will convert the binary data received from telemetry to ASCII. EDRs will then be retrieved at Centro de Astrobiologia (INTA-CSIC) using the File Exchange Interface (FEI). EDR data products have a first automatic process using calibration data. The result of this is the TELRDR dataset, which contains, among others, photodiode output currents in units of nA measured by each UVS channel. In parallel, using ancillary data provided by JPL the ADRs (Ancillary Data Records) are generated, which contain the rover location, pitch, yaw and roll; Sun position relative to the rover frame; azimuth and elevation angles of the masthead. The REMS UVRDR dataset contains UV fluxes acquired when theta < 55 degrees for the first 2000 sols of the mission, corrected for the effects dust deposition and inaccuracies in the original calibration function of the angular response. To perform this correction, calibration data, ADR and TELRDR products, Mastcam opacities at 880 nm and UV radiances simulated with a Monte Carlo radiative transfer model have been used. The REMS UVRDR dataset will not replace UV fluxes contained in the ENVRDR and MODRDR products, but will be posted in a separate folder. Data ==== Each REMS UVRDR product in the dataset is an ASCII table containing corrected UV fluxes, associated uncertainties, and temporal and geometrical information stored in periods of 100 sols, from sol 1 to 2000. Columns are delimited by commas and are of fixed length. Rows are time ordered and are separated by a carriage return/line feed. Each table contains 100 sols worth of activity. Values of UV fluxes and associated uncertainties are set to -999 for theta > 55 degrees. Additionally, values of UV uncertainties for theta < 55 degrees are set to -999 when the mast or masthead of the rover cast a partial shadow on at least one of the UVS channels and interpolation between calculated uncertainties is not possible for that sol. Ancillary Data ============== The ancillary data used in the generation of REMS UVRDR are calibration data, ADRs and TELRDR products, and Mastcam opacities at 880 nm. Calibration data can be found in the CALIB directory. Calibration files are in plain ASCII text format. They are structured in a PDS label-like structure, with the form DATA = VALUE, each value taking up one line. A file per sensor is provided. Coordinate System ================= This data set depends on several coordinate systems used in the MSL project. These are: - MSL_TOPO frame, fixed to landing site, is used to define rover position. - MSL_LOCAL_LEVEL, fixed to the rover, is used to define rover orientation (roll, pitch and yaw angles) - MSL_RSM_ZERO_AZ frame, fixed to the rover, is used to define rover remote sensor mast (RSM) azimuth. - MSL_RSM_ZERO_EL, fixed to the rover, is used to define rover remote sensor mast (RSM) elevation. - MSL_ROVER_MECH, fixed to the rover, is used to define Sun position angles (azimuth and elevation) Software ======== No software is provided in this data set. The REMS UVRDR tables are simple ASCII files that can be displayed on UNIX, Macintosh, and PC platforms with common software. " CONFIDENCE_LEVEL_NOTE = " Confidence Level Overview ========================= Since REMS UVRDRs are the last step in the REMS UV data processing pipeline, its reliability largely depends on that of all the data from previous processing steps. In addition, it also depends on the selection of parameters and modeling used by the REMS team. Review ====== The REMS UVRDRs were reviewed internally by the REMS team prior to release to the PDS. REMS UVRDRs are also being reviewed during the review process of the article Vicente-Retortillo, et al. (2019), In situ UV measurements by MSL/REMS: Dust deposition and angular response corrections, Journal of Geophysical Research: Planets (under review). PDS also performed an external peer review of the REMS RDRs. Data Coverage and Quality ========================= Each REMS UVRDRs table provides corrected UV values measured during periods of 100 sols. Data is dependent on REMS EDRs data products, pre-flight calibration data, SPICE data and ancillary data. Values of UV fluxes and associated uncertainties are set to -999 for theta > 55 degrees. Additionally, values of UV uncertainties for theta < 55 degrees are set to -999 when the mast or masthead of the rover cast a partial shadow on at least one of the UVS channels and interpolation between calculated uncertainties is not possible for that sol. Limitations =========== These data has been subjected to estimations and corrections. To check the original data, refer to ENVRDR and TELRDR records. " END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_MISSION MISSION_NAME = "MARS SCIENCE LABORATORY" END_OBJECT = DATA_SET_MISSION OBJECT = DATA_SET_TARGET TARGET_NAME = MARS END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = MSL INSTRUMENT_ID = REMS END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "VICENTEETAL2019" END_OBJECT = DATA_SET_REFERENCE_INFORMATION END_OBJECT = DATA_SET END