Date/Time of Initial Impact: April 24, 2024 1829Z: During Rev 64729 (AOS 18:29:46z), operations received multiple VIIRS YH alarms indicating S-NPP VIIRS experienced an anomaly and the instrument entered an anomalous state (single board computer lockup suspected). Engineering has started recovery steps and was able to restore the instrument into an operational state in op-day mode by 21:54z. Engineering will resume the remaining recovery steps on Thursday, April 25, 2024.
All missed S-NPP VIIRS data will not be recoverable. All VIIRS science data except day night products are valid for operational use. A future update will provide the status on when the day night bands are ready for operational use. The NOAA-21 and NOAA-20 VIIRS instruments will continue to provide all other JPSS VIIRS data needs.
All S-NPP VIIRS science and CrIS BUFR products are impacted by the ongoing issue.
SNPP VIIRS Anomaly
Re: SNPP VIIRS Anomaly
Update #2 Issued: April 25, 2024 1952 UTC: Engineering was able to successfully execute all planned activities to recover the S-NPP VIIRS instrument by 16:29:22z on Thursday, April 25, 2024. All S-NPP VIIRS products are now available for operational use.
Day/Night Band (DNB) products may experience minimal striping on scan edges until the next New Moon on May 8, 2024.
This will be the final update for this event.
Day/Night Band (DNB) products may experience minimal striping on scan edges until the next New Moon on May 8, 2024.
This will be the final update for this event.