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20 August 2020 Impact of GOES-17 ABI LHP anomaly on its VNIR calibration
Haifeng Qian, Fangfang Yu, Xiangqian Wu, Hyelim Yoo
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Proceedings Volume 11501, Earth Observing Systems XXV; 115011A (2020) https://doi.org/10.1117/12.2568539
Event: SPIE Optical Engineering + Applications, 2020, Online Only
Abstract
The Advanced Baseline Imager (ABI) on GOES-17 also has six Visible and Near Infrared (VNIR) bands that are calibrated periodically using a solar diffuser. Unlike GOES-16, however, GOES-17 suffers from a Loop Heat Pipe (LHP) anomaly that reduced its cooling capacity. As a result, temperature of the Focal Plane Module (FPM) for its VNIR channels can fluctuate diurnally from 185 K to 202K, and the magnitude of this diurnal fluctuation varies seasonally. We found that the VNIR bands gain depends on FPM temperature fluctuation, the correlation is positive for some channels and negative for other channels, and some channel is more sensitive to FPM temperature than others. Such variation creates calibration uncertainty since the gain is determined at one FPM temperature and used to calibrate earth view data collected when the FPM is at a different temperature.To reduce these impacts, several operational mitigation schemes have been proposed and are currently under implementation evaluations.
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Haifeng Qian, Fangfang Yu, Xiangqian Wu, and Hyelim Yoo "Impact of GOES-17 ABI LHP anomaly on its VNIR calibration", Proc. SPIE 11501, Earth Observing Systems XXV, 115011A (20 August 2020); https://doi.org/10.1117/12.2568539
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KEYWORDS
Calibration
Diffusers
Imaging systems
Near infrared
Satellites
Sensors
Visible radiation
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