Administrative, NOAA-18 Reduced Gyro Test Update#1 on 23 and 24 March 2011 - Issued: 22 March 2011 1430 UTC


NOAA-18 Reduced Gyro Test

UPDATE: The NOAA-18 Reduced Gyro Test. The test has been canceled due to the declared critical weather days, covering the proposed test period. Please adjust your issue time accordingly.

Date/Time(UTC) Message Issued:

March 22, 2011, 1430 UTC

Product(s) Involved/Affected:

All data and products from NOAA-18 (AVHRR, AMSU-A, AMSU-B, HIRS, MHS, SBUV)

Date/Time(UTC) of Initial Implementation:

March 23, 2011, Time 11:39 UTC

Date/Time(UTC) of Expected End:

March 24, 2011, Time 18:09 UTC

Length of Outage:

31 hours and 30 minutes

Details/Specifics of Change:

From 23 Mar 2011 at 11:39 UTC (orbit 30083) to 24 Mar 2011 at 18:09 UTC (orbit 30101), NOAA-18 will be placed into the Reduced Gyro Mode for a test. Products may be impacted with a slightly larger than normal attitude disturbances during this period. 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 Reduced Gyro Mode since March 17, 2010.

The test will be ended on March 24th on REV 30101 AOS 17:55:20 UTC, and the spacecraft reconfigured for normal operation. The spacecraft will be commanded back to nominal mode on REV 30103 at 21:27:30.

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


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)


Contact Information for Further Information: ESPC Operations at at 301-817-3880
Web Site(s) for applicable information: N/A