Talk:GEOS-5 ADAS Radiance Monitoring: Difference between revisions
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*'''12 Dec 2011''' - Per Ron Gelaro's email - NCEP staff noted an increase in noise from NOAA-17 HIRS. The change is noticable on the monitoring change as a sudden change in mean and std. deviation of O-F, and a dropoff in the number of accepted obs, starting with the 00UTC analysis on 4 December. We are following NCEPs lead in turning off N17 HIRS, effective as of 12UTC Dec 12 (today). The active_channels.tbl in the GEOS tag is being modifed to reflect turning off data from this satellite effective 00UTC Dec 4. The NCEP GSI and NAM turn off N17 HIRS as of 18UTC on Dec 13. | *'''12 Dec 2011''' - Per Ron Gelaro's email - NCEP staff noted an increase in noise from NOAA-17 HIRS. The change is noticable on the monitoring change as a sudden change in mean and std. deviation of O-F, and a dropoff in the number of accepted obs, starting with the 00UTC analysis on 4 December. We are following NCEPs lead in turning off N17 HIRS, effective as of 12UTC Dec 12 (today). The active_channels.tbl in the GEOS tag is being modifed to reflect turning off data from this satellite effective 00UTC Dec 4. The NCEP GSI and NAM turn off N17 HIRS as of 18UTC on Dec 13. | ||
*'''16 Dec 2011''' [http://www.ssd.noaa.gov/PS/SATS/MESS/MSG3501838.01.txt Update NOAA-17 HIRS Level 1b Data] | |||
From the SSD message: On December 3, 2011 (DOY 337) at 21:25Z, there was an increase in the NOAA-17 HIRS filter motor current and temperature. The motor current increased approximately 20mA to 170mA and later dropped back towards its previous level. There was a few tenths of one degree increase in filterwheel temperature. This anomaly, considered as a sign of aging of the HIRS filter motor, mainly affects the HIRS longwave channels. These channels have escalated but stable noise levels. | |||