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: November 12, 2025 2010Z
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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