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SNPP OMPS Nadir Instruments Stray Light CorrectionsHong Grace Chen, SSAI/GSFC/NASAGlen Jaross, GSFC/NASA Stray Light CharacterizationsStray Light Correction Approach in PEATE’s APPUpdates Have Been Done since LaunchValidation Results and Future Plans for PEATE’s WorkG.Chen, STAR JPSS Annual Science TeamMeeting May 12-16, 20141
Nadir MapperSpectral, 340 pixelsSpatial, 370 pixelsSpatial, 740 pixelsInstrument Stray Light Characterization in Pre-Launch TestsNadir ProfilerSpectral, 340 pixelsG.Chen, STAR JPSS Annual Science TeamMeeting May 12-16, 20142
Stray Light Correction Approach in PEATE’s APPStray LightAccuracySimulation MethodC stray (it , jt ) Cin (is , j s ) PSF (is , j s , it , jt )is j s Cin (is , j s )GHOST (is , j s , it , jt )is j s1. Ground TestMeasurementsAccuracyNMC stray (it , jt ) 740500 is , spec 1 js , spat 1Cin (is , spec , j s , spat ) Jacobian FullSize(is , spec , j s , spat , it , jt , )2. SourceBinningAccuracyApplied in App for NMC stray (it , jt ) 21 36 Cin (k , l ) Jacobian(kspec, lspat , it , jt , )kspec 1 ,lspat 1G.Chen, STAR JPSS Annual Science TeamMeeting May 12-16, 2014Cin (k , l ) Cin (is , j s )m ( k ) ,n (l )3
Validation Results for Nadir ProfilerNP full-frame Earth ViewMeasurement: there are total 80frames in this orbit.Top Left panel: Measured counts(with dark and smear cleaned)Lower Panel: Stray lightpercentage vs wavelength.G.Chen, STAR JPSS Annual Science TeamMeeting May 12-16, 20144
Updates since Launch and Residual for Nadir ProfilerUpdates atdichroic filtertransition areaIDPS Jacobian(SL COR COEFF(1,147,1,14))PEATE Jacobian(370,340,14,7)G.Chen, STAR JPSS Annual Science TeamMeeting May 12-16, 20145
Updates since Launch for Nadir Mapper(NM) In-band, in-field PSF Stray Light In-band, in-field Ghosts-----------First delivery to IDPS Out-of-band PSF Stray Light Out-of-band Ghost (was not fully characterizedduring pre-launch tests)-------Second delivery to IDPSG.Chen, STAR JPSS Annual Science TeamMeeting May 12-16, 20146
G.Chen, STAR JPSS Annual Science TeamMeeting May 12-16, 20147
Before Launch Simulation for NMStray Light PercentageGray: All in-band contributionsGreen: OOR PSF contributionRed : OOR ghost contributionStray light PercentageBlack color: all in-band contributionsRed color : OOR contributionsG.Chen, STAR JPSS Annual Science TeamMeeting May 12-16, 20148
Validation Results for NMLarry F., NOAA, DR7387 G.Chen, STAR JPSS Annual Science TeamMeeting May 12-16, 20149
Residual analysis: Nadir ProfilerMeasuredCounts SignalCounts StrayCounts?The measured counts (Black), calculated stray light counts (Green) and the signal counts(Red) vs CCD spectral index. At the longer wavelength end, the remaining signal counts arenear zero; this suggests no (very few) residual stray light.G.Chen, STAR JPSS Annual Science TeamMeeting May 12-16, 201410
Residual Analysis: Nadir MapperNM full frame measurement before and after stray light is removedThe black-dot lines show the OOR Ghost source spatial locations; the blue thinlines show the OOR Ghost spatial locations. Clearly there are offsets .G.Chen, STAR JPSS Annual Science TeamMeeting May 12-16, 201411
On-Going and Future Work for NM and NPNMWorking on OOR ghost*Spatial dependence*OOR source signal estimationNPMore Need your inputs!Q: What the instrument imaging prosperities changessince launch?Q: What pre-launch tests missed ?G.Chen, STAR JPSS Annual Science TeamMeeting May 12-16, 201412
NM full frame measurement before and after stray light is removed . The black-dot lines show the OOR Ghost source spatial locations; the blue thin lines show the OOR Ghost spatial locations. Clearly there are offsets . 11 G.Chen, STAR JPSS Annual Science Team Meeting May 12 -16
