JPSS-3,-4 VIIRS solar diffuser stability monitor relative spectral response

Jonathan Elgas; Vijay Murgai

doi:10.1117/12.2568767

20 August 2020 JPSS-3,-4 VIIRS solar diffuser stability monitor relative spectral response

Jonathan Elgas, Vijay Murgai

Proceedings Volume 11501, Earth Observing Systems XXV; 115010U (2020) https://doi.org/10.1117/12.2568767
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

The Visible/Infrared Imaging Radiometer Suite (VIIRS) is a key sensor on the Suomi National Polar-orbiting Partnership (NPP) and the Joint Polar Satellite System JPSS-1 as well as the upcoming JPSS-2, JPSS-3, and JPSS-4. VIIRS collects Earth radiometry and imagery in 22 spectral bands from 0.4 to 12.5 μm. Radiometric calibration of the reflective bands in the 0.4 to 2.5 μm wavelength range is performed by measuring the sunlight reflectance from the Solar Diffuser Assembly (diffuser is Spectralon®). Spectralon® is known to solarize due to sun UV exposure at the blue end of the spectrum (~0.4 – 0.6+ μm) as seen by laboratory tests as well as on orbit data from Moderate Resolution Imaging Spectroradiometer (MODIS) on Terra and Aqua and VIIRS on NPP and NOAA-20. Similar to MODIS, the VIIRS uses a Solar Diffuser Stability Monitor (SDSM) to monitor the change in the Solar Diffuser reflectance in the 0.4 – 0.94 μm wavelength range to correct the calibration coefficients. The SDSM measures the ratio of sun light reflecting from the Solar Diffuser to a direct view of the sun at 8 different spectral bands close to the VIIRS bands in spectral regions where solarization effects are present and absent. The spectral response of these bands is critical to calculating the corrections to the radiometric coefficients. The Relative Spectral Response of the 8 SDSM bands for JPSS-3 and JPSS-4 is presented. The out of band response for spectral regions where most of the solarization occurs (< 600 nm) is <0.15% showing minimal mixing with somewhat larger mixing in the low solarization region.

Conference Presentation

Citation Download Citation

Jonathan Elgas and Vijay Murgai "JPSS-3,-4 VIIRS solar diffuser stability monitor relative spectral response", Proc. SPIE 11501, Earth Observing Systems XXV, 115010U (20 August 2020); https://doi.org/10.1117/12.2568767

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