Topic:M-B Metop-C In Plane slow down Drift Maneuver

Date/Time Issued: February 4, 2020 2123Z

Product(s) or Data Impacted:M-B All products from AMSU-A, ASCAT, GOME-2, GRAS, IASI, MHS, in the Metop Global Data Service and Regional Data Service, will not be available.M-BM-BThe AVHRR GDS Level 1 products and AVHRR regional data from Metop-C will be temporarily degraded

Date/Time of Initial Impact: February 5, 2020 0828Z

Date/Time of Expected End: February 5, 2020 1416Z

Length of Outage: Approximately 6 hours

Details/Specifics of change:M-B

On the 5^th of February Metop-C will start a slowdown Drift maneuver to achieve its final orbital position on the 19^th of February (half orbit from Metop-B).M-B During this period, Metop-C will not be following the reference orbit due to the drifting ground track and phasing with respect to Metop-B.M-B Some instrument products may be degraded.M-B A small impact on the number and quality of AVHRR wind products might be observed during this period.M-B

The SEM instrument will be placed into Maneuver Mode at 0828 on Feb 5, 2020 and returned back to its Normal Operating Mode at 1416 that same day.

The GOME instrument timeline ends at 1149 UTC and mirror parked before the burn on Feb 5, 2020.M-B The GOME timeline is reactivated at 1331 UTC that same day.

Data from the outage period will not be recovered nor distributed.M-B

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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