Talk:GEOS-5 ADAS Radiance Monitoring: Difference between revisions
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== CrIS-FSR SNPP Long Wave Signal Processor Failure == | == CrIS-FSR SNPP Long Wave Signal Processor Failure == | ||
* JPSS S-NPP CrIS (Cross Track Infrared Sounder) experienced a Long Wave Signal Processor Failure on August 13, 2023 at approximately 21:32 UTC. Engineering is investigating the cause of the CrIS LWIR failure. The overall health and safety of S-NPP Spacecraft Bus and the remaining instruments on board are nominal. | * JPSS S-NPP CrIS (Cross Track Infrared Sounder) experienced a Long Wave Signal Processor Failure on August 13, 2023 at approximately 21:32 UTC. Engineering is investigating the cause of the CrIS LWIR failure. The overall health and safety of S-NPP Spacecraft Bus and the remaining instruments on board are nominal. | ||
* Update from the CrIS L1B science team (July 20, 2023): This has been diagnosed as an issue with the temperature sensor or readout circuitry and the actual Scene Select Module (SSM) baffle temperature remains nominal. At the time of the anomaly the measured SSM scan baffle temperature data dropped to a fixed and unrepresentative value of 250.1K, where it has remained since that time. The measured value of the SSM scan baffle temperature is used in the Internal Calibration Target (ICT) radiometric model and the polarization correction. The faulty temperature reading results in a cold radiometric bias in the SNPP CrIS calibrated radiances with an estimated magnitude of approximately 0.1 K in the LWIR band and 0.2 K in the SWIR band. Quality flags indicate invalid data for both bands. A solution has been developed and tested to address the issue and significantly reduce cold radiometric bias in the calibrated radiances. This issue will be addressed an upcoming patch for the Version 3 SNPPCrISL1B and SNPPCrISL1BNSR products. | |||