| Instrument: CERES-FM1 : Clouds and the Earth's Radiant Energy System - Flight Model 1 |
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Associated Platforms TERRA Spectral/Frequency Information Number Channels: 1 Spectral/Frequency Coverage/Range: 0.3 μm - 100 μm Wavelength Keyword: Infrared > Reflected Number Channels: 1 Spectral/Frequency Coverage/Range: 0.3 μm - 5 μm Wavelength Keyword: Infrared > Thermal Number Channels: 1 Spectral/Frequency Coverage/Range: 8 μm - 12 μm Related Data Sets View all records related to this instrument Description 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 μm wavelength band, emitted terrestrial radiation in the 8-12 μm band, and total radiation from 0.3 μm to beyond 100 μm. 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 μm); Shortwave (0.3 to 5 μm); Window (8 to 12 μm) 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. Information obtained from http://aqua.nasa.gov/about/instrument_ceres.php and http://asd-www.larc.nasa.gov/ceres/brochure/intro.html Online Resources http://aqua.nasa.gov/about/instrument_ceres.php http://asd-www.larc.nasa.gov/ceres/brochure/intro.html Instrument Logistics Instrument Owner: USA/NASA |
