Status: Note
Users of S-NPP land data products from NASA NRT LANCE and Land SIPS are requested to note that the S-NPP lost its nominal mission pointing status on August 3, 2021 and all instruments have been put in a safe mode. No science data will be available to the users, starting from 12:46 UTC on August 3, 2021. The spacecraft mission team is working to restore the spacecraft to nominal status and we will update this note when the recovery is fully complete and science data collection is resumed.
UPDATE 08.04.21
************************************************S-NPP mission engineering team was able to successfully return the S-NPP spacecraft back to the nominal Mission pointing status at 22:28 UTC (Aug 3, 2021). The instrument recovery efforts commenced at 14:07 UTC Aug 4, 2021. As of 14:17 UTC, ATMS, CERES, and OMPS instruments were recovered. The science data distribution will commence only after all the instruments have been recovered and all instrument operations have been found to be nominal by the respective Cal/Val teams. It is anticipated that by 22:00 UTC Aug 4, that instrument recovery on SNPP should be completed.
UPDATE2 08.04.21
************************************************As of 1600 UTC the VIIRS instrument was recovered. Please note that VIIRS instrument tuning and product quality checks will take at least 2 days.
UPDATE 08.05.21
************************************************NASA LANCE NRT and Land SIPS has started generating the S-NPP VIIRS products, post VIIRS recovery on 1600 UTC August 4. However, several of the onboard VIIRS instrumentation is still under QA by the Cal/Val team and especially the cold focal plane temperature (CFPA) affecting the LWIR/SW-MWIR bands may not have reached the optimal temperature yet, following this VIIRS recovery. A final update from the Cal/Val team is expected soon, confirming the final status of the VIIRS instrumentation and the products. Till then, users are urged to maintain caution while using these data.
UPDATE 08.06.21
************************************************Please note that all S-NPP VIIRS instruments are approaching their nominal status as of 1230 UTC on August 5, 2021, following the VIIRS recovery at 1600 UTC on August 4. The VIIRS Calibration Support Team (VCST) has now evaluated all the VIIRS instruments and have confirmed that all the instruments are either nominal or are approaching their nominal status, as summarized below:
1. TEB Bands - The Cold Focal Plane Temperature approached the nominal temperature of ~80K at 10:15 UTC on August 5 and most TEB band F-factors have been found to be almost nominal since then.
2. VisNIR - The VisNIR bands F-factor values are also approaching gradually their pre-safe mode values and should be mostly nominal now with the exception of the SWIR bands. But the SWIR bands F-factors are expected to become nominal within a few days.
3. DNB Band - Discontinuities have been observed in DNB F-factors and DN0 (e.g. HGS) as well. They are expected to be back to nominal values but may take a few days.
For more detailed findings from the VCST team, please refer to these slides here. For more details on the impact to the downstream VNP14 fire products, please check here
 NPP_VMAES_L1-D, day A2021215 (2021-08-03), AS5000 |
 NPP_VMAES_L1-M13-N, night A2021215 (2021-08-03), AS5000 |
Occurrence: All S-NPP C1 land data products from NRT LANCE, FIRMS, LAADS and GIBS WorldView
PGE: ?