Topic: NOAA-18 Reduced Gyro Enhanced Flight Software On-Orbit Test
Update: The timeline outlined in the original notification is still valid. Our engineers will conduct the planned test.
Date/Time(UTC) Message Issued: September 9, 2011, 1425 UTC
Product(s) Involved/Affected: All data and products from NOAA-18 (AVHRR, AMSU-A, HIRS, MHS, & SBUV)
Date/Time(UTC) of Initial Implementation: September 20, 2011, Time 12:42 UTC
Date/Time(UTC) of Expected End: September 21, 2011, Time 15:53 UTC
Length of Outage: 27 hours and 11 minutes
Details/Specifics of Change: From 20 September 2011 at 12:42 UTC (orbit 32637) to 21 September 2011 at 12:32 UTC (orbit 32651), NOAA-18 will be placed into the Reduced Gyro Mode for a flight software test of the enhanced Reduced Gyro software for about 24 hours. Products may be impacted by slightly 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.
Upon exiting the test on September 21th on REV 32651 AOS 12:32 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 32653 at 15:53 UTC. This is 2 orbits after the end of the Reduced Gyro Mode enhanced flight software test.
Backup dates due to a Critical Weather Day Period cancellation are 12 October 2011 to 13 October 2011 roughly in the same UTC times as above.
Products that use NOAA-18 that will be affected:
ATOVS Polar Soundings
Fire Identification Mapping and Monitoring Algorithm (FIMMA) for Hazard Mapping system (HMS) input
SST and Coastwatch
Microwave Surface and Precipitation Products (MSPPS)
Microwave Integrated Retrieval System (MIRS)
Ensemble Tropical Rainfall Potential (eTRaP)
Global Vegetation Index Products (GVI)
Contact Information for Further Information:
ESPC Operations at ESPCOperations@noaa.gov at 301-817-3880
Carl Gliniak at email@example.com at 301-817-4207
Dejiang Han at firstname.lastname@example.org at 301-817-4119
Web Site(s) for applicable information: N/A