27 December 1995 Verifying short-wave in-flight calibration of the ScaRaB/meteor radiation budget scanner
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Abstract
The French-Russian-German 4-channel ScaRaB (Scanner for Radiation Budget) instrument operated on board the Russian Meteor-3/7 satellite from February 1994 to March 1995. Earth Radiation Budget (ERB) detenninations depend on the two broad-band channels -an unfiltered total (TW) channel sensitive from 0.2 to at least 50 gm, and a short-wave (SW) channel in which a fused silica filter cuts off sensitivity at about 4 jim. In-flight SW calibration depends on lamp sources which may drift or fluctuate. Because daytime LW determinations depend on a weighted subtraction of SW from LW measurements, SW calibration errors will affect the results and can induce a spurious diurnal cycle in the LW. The relative SW sensitivity of the TW and SW channels can be checked, independently of on-board SW lamp sources, by using the ScaRaB JR window (IRW : 1O.5-12.5jim) channel and insisting on diurnal/nocturnal LW consistency. Both the IRW channel and the LW portion of the TW channel are calibrated by reliable on-board black bodies. Results for the first several months of ScaRaB operation are presented, considering also the difficulties arising from the thermal radiation in the near-IR portion of the SW channel. These results are compared with those obtained using the on-board lamp sources. They show that these two methods are complementary: iamps allow accurate monitoring of short-term gain fluctuations while the geophysical method ensures reliability oflamp calibration over the monthly time scale.
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Frederic Raison, Robert S. Kandel, "Verifying short-wave in-flight calibration of the ScaRaB/meteor radiation budget scanner", Proc. SPIE 2578, Passive Infrared Remote Sensing of Clouds and the Atmosphere III, (27 December 1995); doi: 10.1117/12.228958; https://doi.org/10.1117/12.228958
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KEYWORDS
Calibration

Black bodies

Lamps

Sensors

Satellites

Silica

Scanners

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