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Proceedings Paper

Radiometric stability of the clouds and the Earth's radiant energy system scanning thermistor bolometer radiometers
Author(s): Kory J. Priestley; Robert Benjamin Lee; Bruce R. Barkstrom; Susan Thomas; K. Lee Thornhill; Jack Paden; Dhirendra K. Pandey; Robert S. Wilson; Herbert C. Bitting; G. Louis Smith
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Paper Abstract

Each Clouds and the Earth's Radiant Energy System (CERES) instrument contains three scanning thermistor bolometer radiometric channels. These channels measure broadband radiances in the shortwave (0.3 —5.0 rim), total (0.3 - <100 and 8 — 12 im water vapor window regions. Ground-based radiometric calibration of CERES instruments is conducted by TRW, Redondo Beach, CA using their state of the art Radiometric Calibration Facility (RCF). Among the many features of the RCF are longwave and shortwave calibration systems. RCF blackbodies tied to the International Temperature Scale of 1990 ( ITS'90) are used for longwave calibrations. A unique Shortwave Reference Source (SWRS) allows calibration in the 0.4 to 2.0 m region. Additionally, a cryogenically cooled Transfer Active Cavity Radiometer (TACR) allows the transfer of the RCF longwave blackbody source calibration onto the shortwave RCF source. The CERES Internal Calibration Module (1CM) contains blackbody sources for the Total and Window radiometric channels and an evaporated quartz-tungsten lamp for the Shortwave channel. The 1CM sources are used to monitor the radiometric stability of the CERES instruments over their lifetime. Currently three CERES flight instruments (Proto-Flight Model, Flight Model 1, and Flight Model 2) have undergone radiometric calibration in TRW's RCF. This paper presents the timeline of radiometric stability for the PFM instrument since its original calibration in the RCF. This timeline includes spacecraft level thermal-vacuum testing and initial on-orbit data. Keywords: CERES, TRMM, EOS, Radiometry, Calibration

Paper Details

Date Published: 3 October 1998
PDF: 12 pages
Proc. SPIE 3439, Earth Observing Systems III, (3 October 1998); doi: 10.1117/12.325636
Show Author Affiliations
Kory J. Priestley, NASA Langley Research Ctr. (United States)
Robert Benjamin Lee, NASA Langley Research Ctr. (United States)
Bruce R. Barkstrom, NASA Langley Research Ctr. (United States)
Susan Thomas, Science Applications International Corp. (United States)
K. Lee Thornhill, Science Applications International Corp. (United States)
Jack Paden, Science Applications International Corp. (United States)
Dhirendra K. Pandey, Science Applications International Corp. (United States)
Robert S. Wilson, Science Applications International Corp. (United States)
Herbert C. Bitting, TRW Space & Electronics Group (United States)
G. Louis Smith, Virginia Polytechnic Institute and State Univ. (United States)

Published in SPIE Proceedings Vol. 3439:
Earth Observing Systems III
William L. Barnes, Editor(s)

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