Geostationary Earth Radiation Budget (GERB) instrument calibration plans

Details Geostationary Earth Radiation Budget (GERB) instrument calibration plans Geostationary Earth Radiation Budget (GERB) instrument calibration plans

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..19.1307m&link_type=abstract

Advances in Space Research, Volume 19, Issue 9, p. 1307-1316.

Physics

Scientific paper

The Geostationary Earth Radiation Budget (GERB) instrument will provide broad-band measurments of the solar reflected radiation and the thermal emission of Earth from on-board the Second Generation Metosat satellite to be launched in the year 2000. Two spectral channels (solar, 0.32mum-4mum, and total, 0.32mum- >30mum) are available. The thermal emission of the Earth is calcilated from the difference of both channels. The accuracy requirements are 1% and 0.5% for the solar and thermal spectral domain, respectively. GERB features an on-board blackbody and a solar illuminated integrating sphere as calibration sources. On ground, GERB shall be calibrated by the means of blackbodies and an integration sphere. The radiance of the ground calibration sources shall be tracable to the National Physical Laboratory's primary standard for optical radiation measurements, a cryogenic electrical substitution radiometer.

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