Update #1: During NPP Orbit 34655 (AOS 002506Z), the recovery of VIIRS and CRIS instruments were completed. Instruments are running nominally. No other recovery commanding will be executed. IDPS will attempt to reprocess data that is recoverable, however some VIIRS data may be unrecoverable.

Topic: SNPP VIIRS and CrIS reset and recovery

Date/Time Issued: July 6, 2018 0107Z

Product(s) or Data Impacted: SNPP VIIRS and CrIS Sensor data

Date/Time of Initial Impact: Jul 5, 2018 1920Z

Date/Time of Expected End
: Jul 5, 2018 2300Z

Length of Outage: see details

Details/Specifics of Change:
SNPP VIIRS suffered an uncorrectable error and TMON 37 tripped causing swap of 1394 Bus from side B to side A. At AOS of SVL 34652, the CrIS 1394 bus also showed a reset and the CDP root node will need to be recovered. Engineering team is conducting recovery for the next 3 orbits between 19:20 - 2300, and will affect VIIRS and CrIS data. VIIRS instrument will be safed, reset, and both CrIS and VIIRS will be configured back to operation.

Affected orbits are:
SVL 34652: 19:20 - 19:31: VIIRS safed and recycled, VIIRS placed in Op day and producing all data in all bands, including more data during night.
SVL 34653: 21:02 - 21:15
SVL 34653: 22:43 - 22:58

Additional orbits may be required.

Some data may not transferred to users because it did not meet their timeliness requirements.

Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov and 301-817-3880

Web Site(s) for applicable information: N/A

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