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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

Wavelength Keyword: Infrared > Reflected
Number Channels: 1
Spectral/Frequency Coverage/Range: 0.3 ?m - 5 ?m

Wavelength Keyword: Infrared > Thermal
Number Channels: 1
Spectral/Frequency Coverage/Range: 8 ?m - 12 ?m

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)
* Dual scanners on Terra (launched Dec. 1999) and Aqua, and single thereafter.

Instrument Facts:

Heritage: Earth Radiation Budget Experiment (ERBE)
Prime Contractor: TRW
Responsible Center: NASA Langley Research Center
Three Channels in Each Radiometer: Total radiance (0.3 to 100 ?m); Shortwave (0.3 to 5 ?m); Window (8 to 12 ?m)
Swath: Limb to limb
Spatial Resolution: 20 km at nadir
Mass: 50 kg per scanner
Duty Cycle: 100%
Power: 47 W (average) per scanner, 104 W (peak: biaxial mode) both scanners
Data Rate: 10 kbps per scanner
Thermal Control By: Heaters, radiators
Thermal Operating Range: 38 0.1 C (detectors)
Field of View (FOV): 78 cross-track, 360 azimuth
Instrument Instantaneous FOV: 14 mrad
Pointing Requirements (platform + instrument 3?)
Control: 720 arcsec
Knowledge: 180 arcsec
Stability: 79 arcsec/6.6 sec
Physical Size: 60 x 60 x 57.6 cm/unit

There are two CERES on Aqua, following two on the Terra satellite, launched in 1999, and one on the Tropical Rainfall Measuring Mission, launched in 1997.

Online Resources

Instrument Logistics
Instrument Owner: USA/NASA