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Instrument: CERES-FM1 : Clouds and the Earth's Radiant Energy System - Flight Model 1
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Associated Platforms

Spectral/Frequency Information
Number Channels: 1
Spectral/Frequency Coverage/Range: 0.3 ?m - 100 ?m
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Related Data Sets
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The Cloud's and the Earth's Radiant Energy System (CERES) is a 3-channel radiometer measuring reflected solar radiation in the 0.3-5 ?m wavelength band, emitted terrestrial radiation in the 8-12 ?m band, and total radiation from 0.3 ?m to beyond 100 ?m. These data are being used to measure the Earth's total thermal radiation budget, and, in combination with MODIS data, detailed information about clouds. The first CERES instrument was launched on the Tropical Rainfall Measuring Mission (TRMM) satellite in November 1997 as CERES-PFM; the second and third CERES instuments were launched on the Terra satellite in December 1999 as CERES-FM1 AND -FM2; and the fourth and fifth CERES instruments are on board the Aqua satellite, as CERES-FM3 and CERES-FM4.

Instrument Characteristics:

* Selected for flight on TRMM, Terra, and Aqua.
* Two broadband, scanning radiometers: One cross-track mode, one rotating azimuth plane (bi-axial scanning).
* First instrument (cross-track scanning) is continuing ERBE, TRMM, and Terra measurements and the second (biaxially scanning) is providing angular radiance information to improve the accuracy of angular models used to derive the Earth's radiative balance.
* Single scanner on TRMM mission (launched Nov. 1997)
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Instrument Logistics
Instrument Owner: USA/NASA

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