Talk:GEOS-5 ADAS Radiance Monitoring: Difference between revisions
| Line 483: | Line 483: | ||
* 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. | * 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. | ||
* Note that SNPP CrIS is now operating in MW+SW mode. There will no longer be LW data available from SNPP CrIS, since both LW signal processors have failed. | |||
As of Friday September 8, 2023, all CrIS SDR and BUFR products are approved for operational use and NDE/PDA subscriptions for those products were enabled at 15:30 UTC, September 8, 2023. Direct Broadcast (DB) users can use the equivalent CSPP LEO products for operations. | |||
As a reminder, the Long Wave band data will no longer be available from the S-NPP CrIS instrument. | |||
This completes the S-NPP CrIS side-1 to side-2 swap anomaly recovery. | |||