On-orbit Performance of MODIS Solar Diffuser Stability Monitor

Xiaoxiong (Jack) Xiong; Amit Angal; Taeyoung Choi; Junqiang Sun; Eric Johnson

doi:10.1117/12.930963

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15 October 2012 On-orbit performance of MODIS solar diffuser stability monitor

Xiaoxiong (Jack) Xiong, Amit Angal, Taeyoung Choi, Junqiang Sun, Eric Johnson

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Proceedings Volume 8510, Earth Observing Systems XVII; 85100H (2012) https://doi.org/10.1117/12.930963
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

MODIS reflective solar bands (RSB) calibration is provided by an on-board solar diffuser (SD). On-orbit changes in the SD bi-directional reflectance factor (BRF) are tracked by a solar diffuser stability monitor (SDSM). The SDSM consists of a solar integration sphere (SIS) with nine detectors covering wavelengths from 0.41 to 0.94 μm. It functions as a ratioing radiometer, making alternate observations of the sunlight through a fixed attenuation screen and the sunlight diffusely reflected from the SD during each scheduled SD/SDSM calibration event. Since launch, Terra and Aqua MODIS SD/SDSM systems have been operated regularly to support the RSB on-orbit calibration. This paper provides an overview of MODIS SDSM design functions, its operation and calibration strategies, and on-orbit performance. Changes in SDSM detector responses over time and their potential impact on tracking SD on-orbit degradation are examined. Also presented in this paper are lessons learned from MODIS SD/SDSM calibration system and improvements made to the VIIRS SD/SDSM system, including preliminary comparisons of MODIS and VIIRS SDSM on-orbit performance.

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Xiaoxiong (Jack) Xiong, Amit Angal, Taeyoung Choi, Junqiang Sun, and Eric Johnson "On-orbit performance of MODIS solar diffuser stability monitor", Proc. SPIE 8510, Earth Observing Systems XVII, 85100H (15 October 2012); https://doi.org/10.1117/12.930963

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