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NOAA-17, AMSU-A Antenna Anomaly, 28 October 2003 - Issued: 28 October 2003; 1245 UTC

From:
7:43 AM
Subject: NOAA-17, AMSU-A Antenna Anomaly, 28 October 2003 - Issued: 28 October 2003; 1245 UTC
Resent-From: nesdis.osdpd.ipd.Level-1B.notices@noaa.gov,
nesdis.osdpd.ipd.contractors@noaa.gov

Topic:
AMSU-A Antenna Anomaly - Bad Level 1B Data

Date/Time(UTC) Message Issued:
28 October 2003, 1245 UTC

Satellite(s) Involved:
NOAA-17

Instrument(s) Involved:
AMSU-A

Product(s) Involved/Affected:
All products/Improved timing

Date/Time(UTC) of Initial Implementation:
28 October 2003, Time 0420 UTC

Details/Specifics of Change:
SOCC has issued the following notice:
"Today at approximately 04:20z, the AMSU-A1 scan motor antenna appears to
show that it is in a stuck position. PIDES is showing no usable data from
the instrument. At 14:23z, we plan to turn the both scan motors off. The
NASA TO has been notified and agrees with us to turn off the scan
motors at this time. Investigation of this anomaly will continue.

From the telemetry, the antenna motor currents (NAM1MT1I and NAM1MT2I)
instantaneously went from 80 mA to 139 mA and the antenna + 15 Volts
(NAM1AN15) went from the nominal +15 V to 16.3V and antenna -15 Volts
(NAM1A_15) went from -15 V to -19.25 V. Since the incident the scan motor
temperatures have been increasing."

Contact Person(s) Name/Email/Phone Number for Questions:
Emily.Harrod@noaa.gov/301-457-5247 ext. 117
Cecil.Paris@noaa.gov/301-457-5247 ext. 129

Web site(s) that contain other relevant information (where applicable):
http://noaasis.noaa.gov/NOAASIS/ml/gateway.html (under "Satellite ...
Calibration")
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


ppp@nesdis.noaa.gov

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