Topic: NOAA-18 Reduced Gyro Enhanced Flight Software On-Orbit Test
Update: The timeline outlined in the original notification is still valid. However, there will not be any science data for MHS from 12:31 UTC to 17:45 UTC, since the instrument will be put in a standby mode during the test. Users will have data for AVHRR, AMSU-A, HIRS and SBUV, though the geolocation accuracy will be degraded as stated in the original notification.
Date/Time(UTC) Message Issued: October 13, 2011, 1330 UTC
Product(s) Involved/Affected: All data and products from NOAA-18 (AVHRR, AMSU-A, HIRS, MHS, & SBUV)
Date/Time(UTC) of Initial Implementation: October 19, 2011, Time 12:31 UTC
Date/Time(UTC) of Expected End: October 19, 2011, Time 20:52 UTC
Length of Outage: 8.5 hours
Details/Specifics of Change: From 19 October 2011 at 12:31 UTC (orbit 33046) to 19 October 2011 at 17:32 UTC (orbit 33049), NOAA-18 will be placed into the ACS Reduced Gyro Mode for a flight software test of the enhanced Reduced Gyro software with the degraded laser gyro correction for about 5 hours (3 orbits). Products may be impacted by larger than normal yaw attitude disturbances. The performance of NOAA-18 instrument L1b data is expected to be similar to the counterpart of NOAA-15, which has been operated in the enhanced Reduced Gyro Mode since March 17, 2010. The geolocation errors could be up to 15 km.
Upon exiting the test on October 19th on REV 33049 AOS 17:32 UTC the spacecraft will be reconfigured for normal operation (all three gyros available for ACS control). The spacecraft will be commanded back to nominal mode (all three gyros and sun sensor available for ACS control) on REV 33051 at 20:52 UTC. This is 2 orbits after the end of the Reduced Gyro Mode enhanced flight software test with the bad MIMU.
Backup date due to a Critical Weather Day Period cancellation is 02 November 2011 roughly in the same UTC times as above.
Update: The timeline outlined in the original notification is still valid. However, there will not be any science data for MHS from 12:31 UTC to 17:45 UTC, since the instrument will be put in a standby mode during the test. Users will have data for AVHRR, AMSU-A, HIRS and SBUV, though the geolocation accuracy will be degraded as stated in the original notification.
Products that use NOAA-18 that will be affected:
ATOVS Polar Soundings
Radiation Budget
Fire Identification Mapping and Monitoring Algorithm (FIMMA) for Hazard Mapping system (HMS) input
CLAVR-X
SST and Coastwatch
Microwave Surface and Precipitation Products (MSPPS)
Microwave Integrated Retrieval System (MIRS)
Blended TPW
Ozone: SBUV/2
Ozone: TOAST
Ensemble Tropical Rainfall Potential (eTRaP)
Global Vegetation Index Products (GVI)
AVHRR Winds
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Contact Information for Further Information:
ESPC Operations at ESPCOperations@noaa.gov at 301-817-3880
Carl Gliniak at carl.gliniak@noaa.gov at 301-817-4207
Dejiang Han at dejiang.han@noaa.gov at 301-817-4119
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