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NOAA-18,HIRS Instrument, Increase in noise, Implementation Date 26 September 2005- Issued: Date 26 September 2005 time issue 10:40 UTC

*Topic*:
NOAA-18 HIRS instrument all channels show increase in noise

*Date/Time(UTC) Message Issued:*
26 September 2005 10:40 UTC

*Satellite(s) Involved:*
NOAA-18

*Instrument(s) Involved:*
HIRS instrument

*Product(s) Involved/Affected:*
All products using NOAA-18 HIRS data
*Date/Time(UTC) of Initial Implementation:*
26 September 10:40 UTC
*Details/Specifics of Change:*
Currently, all HIRS/NOAA-18 longwave channels are out of the spec again (2-3 times of the spec.). The noise is most noticeable in the cold channels. HIRS/NOAA-18 radiance data should not be used for product generation till further notice.
*Contact Person(s) Name/Email/Phone Number for Questions:*
Dr. Chanyong Cao
Instrument Scientist
301-763-8136 ext 196
chanyong.cao@noaa.gov

Cecil Paris
Physical Scientist
301-457-5247 ext 129
cecil.paris@noaa.gov

*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/poesstatus/ - SOCC polar satellites status
http://www.oso.noaa.gov/daily-news/index.htm - SOCC morning reports

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*
* Emily D. Harrod
* NOAA/NESDIS/OSDPD/IPD
* Product Systems Branch
* Pre-Product Processing Group
* E/SP13, Federal Building #4, room 0318
* 5200 Auth Road
* Suitland, Maryland 20746-4304
* USA
* voice 301-457-5247 ext 117
* fax 301-457-5199
* email Emily.Harrod@noaa.gov
*
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ppp@nesdis.noaa.gov

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