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Proceedings Paper

1999-2003 shortwave characterizations of Earth Radiation Budget Satellite (ERBS)/Earth Radiation Budget Experiment (ERBE) broadband active cavity radiometer sensors
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Paper Abstract

From October 1984 through August 2005, the NASA Earth Radiation Budget Satellite (ERBS)/Earth Radiation Budget Experiment (ERBE) nonscanning active cavity radiometers (ACR) were used to monitor long-term changes in the earth radiation budget components of the incoming total solar irradiance (TSI), earth-reflected TSI, and earth-emitted outgoing longwave radiation (OLR). From October 1984 through September 1999, using on-board calibration systems, the ERBS/ERBE ACR sensor response changes, in gains and offsets, were determined from on-orbit calibration sources and from direct observations of the incoming TSI through calibration solar ports at measurement precision levels approaching 0.5 Watts-per-squared-meter, at satellite altitudes. On October 6, 1999, the on-board radiometer calibration system elevation drive failed. Thereafter, special spacecraft maneuvers were performed to observe cold space and the sun in order to define the post-September 1999 geometry of the radiometer measurements, and to determine the October 1999-September 2003 ERBS sensor response changes. Analyses of these special solar and cold space observations indicate that the radiometers were pointing approximately 16 degrees away from the spacecraft nadir and on the antisolar side of the spacecraft after the elevation drive failure. The special observations indicated that the radiometers' responses were stable at precision levels approaching 0.5 Watts-per-squared-meter. In this paper, determinations of the measurement geometry [sensor pointing direction] and of the radiometers' gain and offset are presented. These determinations will permit the accurate processing of the October 1999 through August 2005 ERBE data products at satellite and top-of-the-atmosphere altitudes.

Paper Details

Date Published: 20 August 2008
PDF: 9 pages
Proc. SPIE 7081, Earth Observing Systems XIII, 708117 (20 August 2008); doi: 10.1117/12.797109
Show Author Affiliations
Robert B. Lee III, Consultant, National Institute of Aerospace (United States)
George L. Smith, National Institute of Aerospace (United States)
Takmeng Wong, NASA Langley Research Ctr. (United States)
Kathryn A. Bush, Science Systems and Applications, Inc. (United States)

Published in SPIE Proceedings Vol. 7081:
Earth Observing Systems XIII
James J. Butler; Jack Xiong, Editor(s)

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