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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 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.
Group: Instrument_Details
Entry_ID: CERES-FM1
Group: Instrument_Identification
Instrument_Category: Earth Remote Sensing Instruments
Instrument_Class: Passive Remote Sensing
Instrument_Type: Spectrometers/Radiometers
Instrument_Subtype: Radiometers
Short_Name: CERES-FM1
Long_Name: Clouds and the Earth's Radiant Energy System - Flight Model 1
End_Group
Group: Associated_Platforms
Short_Name: TERRA
End_Group
Group: Spectral_Frequency_Information
Number_Channels: 1
Spectral_Frequency_Coverage_Range: 0.3 μm - 100 μm
End_Group
Group: Spectral_Frequency_Information
Wavelength_Keyword: Infrared > Reflected
Number_Channels: 1
Spectral_Frequency_Coverage_Range: 0.3 μm - 5 μm
End_Group
Group: Spectral_Frequency_Information
Wavelength_Keyword: Infrared > Thermal
Number_Channels: 1
Spectral_Frequency_Coverage_Range: 8 μm - 12 μm
End_Group
Online_Resource: http://ceres.larc.nasa.gov/terra_ceres.php
Online_Resource: http://ceres.larc.nasa.gov/
Creation_Date: 2008-07-22
Group: Instrument_Logistics
Instrument_Owner: USA/NASA
End_Group
End_Group
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