Modeling spectral degradation of MODIS and VIIRS solar diffusers

Xi Shao; Tung-Chang Liu; Xiaoxiong Xiong; Changyong Cao; Taeyoung Choi; Amit Angal

doi:10.1117/12.2528442

9 September 2019 Modeling spectral degradation of MODIS and VIIRS solar diffusers

Xi Shao, Tung-Chang Liu, Xiaoxiong Xiong, Changyong Cao, Taeyoung Choi, Amit Angal

Proceedings Volume 11127, Earth Observing Systems XXIV; 111271S (2019) https://doi.org/10.1117/12.2528442
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

Solar diffusers (SDs) onboard the Moderate Resolution Imaging Spectroradiometer (MODIS) on Terra and Aqua spacecraft and the Visible Infrared Imaging Radiometer Suite (VIIRS) on SNPP and NOAA-20 spacecraft have been used as the primary onboard radiometric calibrator for reflective solar bands and their spectral reflectance is known to degrade on-orbit. All of the solar diffusers on these instrument show faster degradation of reflectance in the 0.4 to 0.6 µm channels than the longer wavelength channels. The spectral degradation of these SDs is due to the surface roughness growth under the exposure to solar UV and energetic particle radiation in space. In this paper, the origin of SD degradation is modeled by the physics-based Surface Roughness-induced Rayleigh Scattering (SRRS) model. The longterm growths of surface roughness of the SD on these instruments are characterized to show the consistency of SD roughness growth rates between Terra/Aqua MODIS and SNPP/NOAA-20 VIIRS. There was coincidental flattening or reverse in the growth trend of the surface roughness for the Terra/Aqua MODIS and SNPP VIIRS SDs, which can be due to the space weather variation. The applicability of the SRRS model is demonstrated with the long term spectral reflectance data from independent spaceborne SDs.

Citation Download Citation

Xi Shao, Tung-Chang Liu, Xiaoxiong Xiong, Changyong Cao, Taeyoung Choi, and Amit Angal "Modeling spectral degradation of MODIS and VIIRS solar diffusers", Proc. SPIE 11127, Earth Observing Systems XXIV, 111271S (9 September 2019); https://doi.org/10.1117/12.2528442

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KEYWORDS

MODIS

Reflectivity

Surface roughness

Calibration

Solar radiation models

Data modeling

Solar radiation

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