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On-Orbit Performance of MODIS Solar Diffuser Stability MonitorMODIS 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 microns. 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.
Document ID
20160005180
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Xiong, Xiaoxiong
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Angal, Amit
(Science Systems and Applications, Inc. Lanham, MD, United States)
Choi, Taeyoung
(Sigma Space Corp. Lanham, MD, United States)
Sun, Jungiang
(Sigma Space Corp. Lanham, MD, United States)
Johnson, Eric
(Raytheon Space and Airborne Systems El Segundo, CA, United States)
Date Acquired
April 19, 2016
Publication Date
December 31, 2014
Publication Information
Publication: Earth Observing Systems XVII
Publisher: SPIE
Volume: 8510
ISSN: 0277-786X
ISBN: 9.78E+12
Subject Category
Solar Physics
Report/Patent Number
GSFC-E-DAA-TN31367
Funding Number(s)
CONTRACT_GRANT: NNG15HQ01C
Distribution Limits
Public
Copyright
Other
Keywords
MODIS
VIIRS
Radiometer

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