143
NOUS72 KNES 042149
ADMNES
UPDATE #2: WITH THE EXECUTION OF THE S-NPP VIIRS DAY-NIGHT-BAND
CALIBRATIONS PERFORMED ON NOVEMBER 20, 2025 AND THE DEPLOYMENT OF S-NPP
VIIRS IDPS LOOK UP TABLES IMPLEMENTED INTO OPERATIONS TODAY ON DECEMBER 4,
2025 AT 17:01Z, ALL S-NPP VIIRS SCIENCE PRODUCTS ARE CLEARED FOR
OPERATIONAL USE. THIS WILL BE THE FINAL CLOSEOUT NOTICE FOR THIS ANOMALY.


UPDATE #1: THE S-NPP VIIRS INSTRUMENT EXPERIENCED A DATA LOSS EVENT ON
NOVEMBER 11, 2025 AT 11:36:40Z DUE TO A SINGLE EVENT UPSET WITHIN THE
ROTATING TELESCOPE ASSEMBLY.  ENGINEERING WAS ABLE TO RESTORE THE S-NPP
VIIRS INSTRUMENT TO AN OPERATIONAL STATE ON NOVEMBER 12 AT 16:29:18Z WITH
FULL OP- DAY/OP-NIGHT COMMANDING BEGINNING AT 19:43:36 DAILY ACTIVITY
SCHEDULE LOAD. ALL MISSED S-NPP VIIRS DATA IS UNRECOVERABLE. AN UPDATE WILL
FOLLOW AFTER CAL/VAL TEAMS VALIDATE THE DATA AS ACCEPTABLE.  DATA USED
BEFORE THAT VALIDATION IS COMPLETED IS AT THE USER   S OWN RISK.


TOPIC: JPSS NPP VIIRS DATA DELAY

DATE/TIME ISSUED: DECEMBER 04, 2025 2135Z



PRODUCT(S) OR DATA IMPACTED:  NPP VIIRS DATA

DATE/TIME INITIAL IMPACT: NOVEMBER 11, 2025 1140Z

DATE/TIME OF EXPECTED END: NOVEMBER 12, 2025 16:30:06Z

 LENGTH OF OUTAGE: 28 HOURS AND 40 MINUTES

DETAILS/SPECIFICS: NPP VIIRS INSTRUMENT EXPERIENCING DATA OUTAGE SINCE REV
72755 AT FAIRBANKS. UPDATE WILL BE PROVIDED WHEN AVAILABLE.


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