Laboratory For Atmospheric and Space Physics University of Colorado Boulder, Colorado TOTAL AND SPECTRAL SOLAR IRRADIANCE SENSOR (TSIS-1) SCIENCE DATA PRODUCTS GUIDE Document No. 159520 Approvers List Prepared By Stéphane Béland, TSIS-1 Science Data System Lead, LASP Approved By Peter Pilewskie, TSIS-1 LASP Principal Investigator, LASP Approved By Erik Richard, TSIS-1 SIM Instrument Scientist, LASP Approved By Greg Kopp, TSIS-1 TIM Instrument Scientist, LASP Approved By Brian Boyle, TSIS-1 Project Manager, LASP Approved By Christopher K. Pankratz, LASP Data Systems Manager, LASP Configuration Management Rev Change Description By A Updated uncertainty sections SBeland
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Laboratory For Atmospheric and Space Physics University of Colorado
Boulder, Colorado
TOTAL AND SPECTRAL SOLAR IRRADIANCE SENSOR (TSIS-1)
SCIENCE DATA PRODUCTS GUIDE
Document No. 159520
Approvers List
Prepared By StéphaneBéland,TSIS-1ScienceDataSystemLead,LASP
Approved By PeterPilewskie,TSIS-1LASPPrincipalInvestigator,LASP
Approved By ErikRichard,TSIS-1SIMInstrumentScientist,LASP
Approved By GregKopp,TSIS-1TIMInstrumentScientist,LASP
Approved By BrianBoyle,TSIS-1ProjectManager,LASP
Approved By ChristopherK.Pankratz,LASPDataSystemsManager,LASPConfiguration Management
1 INTRODUCTION .................................................................................................... 61.1 PurposeandScope.....................................................................................................................................61.2 RelevantDocuments.................................................................................................................................62 DATA PRODUCTS OVERVIEW ................................................................................ 62.1 DataProductDefinition...........................................................................................................................62.2 DataProcessingLevels............................................................................................................................72.3 DataFlow.......................................................................................................................................................73 Level 3 Data Products ........................................................................................... 93.1 TIMProcessing............................................................................................................................................93.2 SIMProcessing.........................................................................................................................................104 DATA ACCESS AND AVAILABILITY ........................................................................ 12
5 DATA FILE FORMAT AND DATA DEFINITIONS ...................................................... 135.1 TIM.................................................................................................................................................................145.2 SIM.................................................................................................................................................................156 DATA RELEASE NOTES ......................................................................................... 16
1 INTRODUCTION 1.1 Purpose and Scope This document describes the Science Data Products for the Total and Spectral SolarIrradianceSensor(TSIS-1)mission.Itdescribesthemission’sdataproductscontentandformatasdeliveredtothescientificcommunity.Thisdocumentisintendedtobeaguidefortheendusersdescribingthedatagenerated,whereandhowtoaccessthedata,aswellasinformationaboutthespecificdatafieldsandfeaturestheyshouldbeawareof.
2 DATA PRODUCTS OVERVIEW 2.1 Data Product Definition TheTSIS-1projectwillusethedataleveldefinitionsthatareidenticaltothoseusedforboth the SORCE and TCTE projects and are consistent with NASA Earth ScienceconventionsasdescribedintheEarthScienceReferenceHandbook–AguidetoNASA’sEarth Science Program and Earth Observing Satellite Missions [available viahttp://eospso.nasa.gov/publications/56].TheTSIS-1standarddataproductsconsistofthreelevelsofprocessing:Fullresolution,time-referenced data with all calibration information for each instrument (Level 1);Calibrated,sortedTIMandSIMirradiancedata(Level2);Dailyand6-hourlymeanTSIanddailyand12-hourlymeanSSImeasurements(Level3).ThespecificleveldefinitionspertainingtoTSISareshowninError!Referencesourcenotfound..Level0TSISrawdatarecords(RDR)collectedonISSwillbeprocessedintothesehigher-levelsensordatarecords(SDR)asindicatedinthistable.
2.2 Data Processing Levels TheTSISScienceDataSystem(TSDS)deliversLevels0,1,2and3totalandspectralsolarirradiancedataproductstotheGESDISConamonthlycadence.FileformatsarechosenforconsistencywithSORCEandTCTEdata,andforcompatibilitywithexistingsystemsandinterfacesatLASPandtheGESDISC.ThefollowingformatswillbeusedforTSIS-1data:
TIM SIMLevel0 RawBinaryLevel1 HDF5/NetCDFLevel2 HDF5/NetCDF HDF5/NetCDFLevel3 ASCII ASCII
Table3:DataFileFormat
TheTSDSonlymakesavailablethefullycalibratedLevel-3dataproducttothesciencecommunityandgeneralpublic. Lower-leveldataproducts (e.g., Level2)havelimitedscientific value due to data gaps and instrument artifacts (which are precluded fromLevel3dataviaqualityflags)andarethereforenotmadepubliclyavailable.Shorttime-rangesofthesedatawill,however,beavailableuponrequestfromtheTSISscienceteamforspecific,well-definedresearchefforts.
2.3 Data Flow TheTSIS-1groundsystemsupportson-orbitoperationsof theTSIS-1 instruments,aswellastheproduction,storage,management,anddisseminationoftheTSISsciencedata
Responsible for TSIS-1 instrument mission planning, routine state-of-healthmonitoring,andinstrumentsuitecommanding
- TSIS Science Data Systems (TSDS) - Located at LASP in Boulder, Colorado.Responsibleforinstrumentcalibration,sciencedataprocessinganddataproductgeneration,sciencedatamanagement,datavalidation,publicdatadissemination,anddistributionofdatatotheGESDISC
operations by routing TSIS-1 payload commands to the ISS, retrieving andtemporallyarchivingpayloaddataandISSdatasuchasattitudeandephemeris,routinely transmitting stored data to the LASP TSOC, and performingmissioncriticalpayloadhealthandstatusmonitoring.
- NASA GES DISC. Located at NASA GSFC in Greenbelt, MD. The GES DISC isresponsibleforsciencedataarchivinganddistribution.
3 Level 3 Data Products TheLevel3dataconsistofdailyand6-hourlyaveragedtotalsolarirradiance(TSI),anddailyand12-hourlyaveragedspectralsolarirradiance(SSI).TheLevel3SIMdataarebinnedtoapre-definedwavelengthgrid,providingdatainaformatmostfamiliartothescientificcommunity.
Within24hoursofLevel2andcalibrationdataavailability,allinstrumentsciencedataandspacecraftengineeringdataareprocessedtoderiveLevel3sciencedataproductsinstandardgeophysicalunits(Wm-2forTSIandWm-2nm-1forSSI).Thesedataaremadeavailabletothescientificcommunitythroughdatadistributioncenters.3.1 TIM Processing TheprocessingoftheTSIS-1TIMdataisbasedonexistingcode,originallyadaptedfromSORCETIM,nowsharedbytheSORCE,TCTEandTSISmissions.Changesweremadetoaccount for the different telemetry format, the addition of the SPICE software(https://naif.jpl.nasa.gov)forhandlingthecomplexISSandTPSpointing,andtheaddedISSobstructioninformation(ISSPointingOffice).TheproductionofthecalibratedTSIfromTIMrawdatatakesthefollowingprocessingsteps(depictedinFigure2):
equation in the data processing system leverages the SORCE experiences, but isoptimizedforTSISconsideringthesignificantdifferenceswithSORCESIMinthevariousoperationalmodes(differenttypeofdiodereadoutandESRmeasurements).
4 DATA ACCESS AND AVAILABILITY TheprimarydataarchivefortheTSIS-1dataislocatedattheGoddardEarthSciences-DataandInformationServicesCenter(GESDISC)wherethedatacanbedownloaded
5 DATA FILE FORMAT AND DATA DEFINITIONS TheGESDISCandtheLASPTSISwebsiteprovidetheLevel3dataproductsastextfilescoveringthewholemission.Additionally,theLASPwebsiteprovidesIDL‘save’fileswiththedataintheformofadatastructureandanIDLroutinetoreadthetextfilesintodatastructures.
6 DATA RELEASE NOTES Itisimportantfortheuserofthesedataproductstoreadthereleasenotesassociatedwitheachdataset.Thesewillcontaincriticalinformationrelatedtodataprocessing,dataquality,andpossibledataissuesrelatedtothedataproducts.Thereleasenotesareavailableatthesamesitesasthedata(seeSection4above).