Concept for a full-Earth albedo radiometer on a GOES satellite

James C. Bremer; Joseph C. Criscione

doi:10.1117/12.558713

26 October 2004 Concept for a full-Earth albedo radiometer on a GOES satellite

James C. Bremer, Joseph C. Criscione

Proceedings Volume 5542, Earth Observing Systems IX; (2004) https://doi.org/10.1117/12.558713
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

A small integrating sphere with two pinhole apertures can be hard-mounted to the nadir-facing surface of a 3-axis stabilized GOES satellite in geostationary orbit. One pinhole can be baffled to produce a circular field-of-fiew (FOV) 18° in diameter, centered at nadir, allowing it to view the Earth's full disk continuously. A second, smaller pinhole can be baffled to produce a rectangular FOV that subtends 1° in the East/West direction and +/- 25° in the North/South direction, centered 22.5° west of nadir. The solar irradiance transmitted through the smaller pinhole will be added to the Earth's irradiance for a brief interval at 2230 hrs, local time, once each night. A detector in the integrating sphere can measure the ratio of the full-disk irradiance to the direct solar irradiance in any desired solar-reflective spectral band, independent of the detector's gain and the sphere's reflectivity. These stable, long-term measurements of the daily and seasonal albedo variations are valuable for climatic studies. This full-disk ratioing radiometer (FDRR) can be placed on a GOES-R satellite and equipped with a six spectral channels matched to the six solar-reflective channels of the Advanced Baseline Imager (ABI). Each ABI channel can then be calibrated by comparing the full-disk albedo derived from every one of its full disk images to that measured simultaneously by the FDRR. The FDRR is small and light, has no moving parts, requires minimal electrical power, has a low data rate, and calibrates the ABI continuously without interrupting its Earth observations or blocking its aperture.

Citation Download Citation

James C. Bremer and Joseph C. Criscione "Concept for a full-Earth albedo radiometer on a GOES satellite", Proc. SPIE 5542, Earth Observing Systems IX, (26 October 2004); https://doi.org/10.1117/12.558713

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