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Proceedings Paper

On-orbit solar calibrations using the TRMM clouds and the Earth's radiant energy system (CERES) in-flight calibration system
Author(s): Robert S. Wilson; Robert Benjamin Lee; Bruce R. Barkstrom; Herbert C. Bitting; Jack Paden; Dhirendra K. Pandey; Kory J. Priestley; G. Louis Smith; Susan Thomas; K. Lee Thornhill
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Paper Abstract

The CERES spacecraft scanning thermistor bolometers measure earth-reflected solar and earth-emitted longwave radiances, at the top-of-the-atmosphere. The bolometers measure the earth radiance in the broadband shortwave solar and total spectral bands as well as in the 8-12 micrometers water vapor window spectral band over geographical footprints as small as 10 kilometers at nadir. November 1997, the first set of CERES bolometers was launched on the Tropical Rainfall Measuring Mission spacecraft. Ground vacuum calibrations define the initial count conversion coefficients that are used to convert the bolometer output voltages into filtered earth radiances. The mirror attenuator mosaic (MAM), a solar diffuser plate, was built into the CERES instrument package calibration using the solar radiances reflected from the MAM's. Each MAM consists of baffle-solar diffuser plate system, which guide incoming solar radiances into the instrument fields of view of the shortwave and total wave sensor units. The MAM diffuser reflecting type surface consists of an array of spherical, overcoated with silicon dioxide. Thermistors are located in each MAM plate and baffle. The CERES MAM is designed to yield calibration precisions approaching 2 percent for the total and shortwave detectors. In this paper, the MAM solar calibration data reduction techniques are presented along with on-orbit measurements.

Paper Details

Date Published: 3 October 1998
PDF: 10 pages
Proc. SPIE 3439, Earth Observing Systems III, (3 October 1998); doi: 10.1117/12.325638
Show Author Affiliations
Robert S. Wilson, Science Applications International Corp. (United States)
Robert Benjamin Lee, NASA Langley Research Ctr. (United States)
Bruce R. Barkstrom, NASA Langley Research Ctr. (United States)
Herbert C. Bitting, TRW Space and Electronics Group (United States)
Jack Paden, Science Applications International Corp. (United States)
Dhirendra K. Pandey, Science Applications International Corp. (United States)
Kory J. Priestley, NASA Langley Research Ctr. (United States)
G. Louis Smith, Virginia Polytechnic Institute and State Univ. (United States)
Susan Thomas, Science Applications International Corp. (United States)
K. Lee Thornhill, Science Applications International Corp. (United States)


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

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