998
NOUS72 KNES 281704
ADMNES
TOPIC: GPS INVALID ON S-NPP SPACECRAFT

DATE/TIME ISSUED: MAY 28, 2024  1649Z



PRODUCT(S) OR DATA IMPACTED: ALL S-NPP VIIRS DATA PRODUCTS



DATE/TIME OF INITIAL IMPACT: MAY 25, 2024 22:30 UTC

DATE/TIME OF EXPECTED END TIME:   TBD

DURATION: TBD

DETAILS: STARTING ON MAY 25 AT ~22:30 UTC, THE GPS ON THE S-NPP SPACECRAFT
TOGGLED TO INVALID CAUSING THE GEOLOCATION OF ALL OBSERVED DATA TO BE
INACCURATE AND OUT OF THE MISSION SPECIFICATIONS. ENGINEERING HAS STARTED
PLANNING THE EXECUTION OF THE RESET OF THE GPS UNIT ON THE S-NPP
SPACECRAFT. THE ANTICIPATED RESET OF THE GPS UNIT IS EXPECTED NO EARLIER
THAN MAY 29, 2024. ALL PDA OPS SUBSCRIPTIONS FOR ALL S-NPP VIIRS SCIENCE
PRODUCTS WILL BE DISABLED AT 17:00 UTC ON MAY 28, 2024.

AS S-NPP HIGH RATE DATA (HRD) REMAINS ENABLED FOR ALL VIIRS PRODUCTS,
DIRECT BROADCAST (DB) USERS ARE ADVISED THAT THIS S-NPP VIIRS SCIENCE DATA
IS NOT YET CLEARED FOR OPERATIONAL USE.

THE NOAA-21 AND NOAA-20 SATELLITES WILL CONTINUE TO PROVIDE JPSS VIIRS
SCIENCE DATA AS THE PRIMARY AND SECONDARY SATELLITES, RESPECTIVELY.



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ESPCOPERATIONS@NOAA.GOV AT 301-817-3880



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