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Administrative, NOAA-19, MHS, MHS H3 DCO Auto Correction, 16 September 2009 - Issued: 16 September 2009; 2050 UTC

Subject: Administrative, NOAA-19, MHS, MHS H3 DCO Auto Correction, 16 September 2009 - Issued: 16 September 2009; 2050 UTC

Topic:
MHS H3 DCO Auto Correction

Date/Time(UTC) Message Issued:
16 September 2009, 2050 UTC

Satellite(s) Involved:
NOAA-19

Instrument(s) Involved:
MHS

Product(s) Involved/Affected:
NOAA-19 MHS 1b Data and Products

Date/Time(UTC) of Initial Implementation:
16 September 2009, Time 0344 UTC

Details/Specifics of Change:
The NOAA-19 MHS experienced another DC Offset Automatic Adjustment to its Channel H3 on 2009/259 (September 16) at 03:44:30 UTC. The automatic adjustment occurred when the H3 Space View signal dropped below the 5% signal level threshold (3,276 counts). The DCO value changed from the previous value of 0x63 (99 decimal) to 0x55 (85 decimal), causing an upward shift of all H3 readings by 24,640 counts (14 DCO steps * 1670 counts per DCO step).

The adjustment was immediately preceded by a period of 2 hours in which the channel counts experienced a high rate of decline; down approximately 7,000 counts in 2 hours. Following the DCO Auto Adjustment, the channel counts returned to their orbital pattern prior to the rapid decrease.

.Contact Person(s) Name/Email/Phone Number for Questions:

Vince Tabor Vincent.Tabor@noaa.gov 301-817-4552
Dong Han Dong.Han@noaa.gov 301-817-4232

Web site(s) that contain other relevant information (where applicable):
http://www.osdpd.noaa.gov/PSB/PPP/PPP.html - History of level 1B notices
http://www.ssd.noaa.gov/PS/SATS/messages.html - All user notices
http://www.oso.noaa.gov/poes/index.htm - SOCC polar satellite status
http://www.oso.noaa.gov/goes/index.htm - SOCC geostationary satellite status
http://www.oso.noaa.gov/daily-news/index.asp - SOCC morning reports

Administrative, NOAA-19, MHS, MHS H3 DCO Auto Correction, 16 September 2009 - Issued: 16 September 2009; 2050 UTC.eml

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ppp@nesdis.noaa.gov

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