NOAA-16, AVHRR, Scan Motor Current and Synch Delta Anomaly, 18 September 2003 - Issued: 18 September 2003; 1800 UTC

Scan Motor Current and Synch Delta Anomaly

Date/Time(UTC) Message Issued:
18 September 2003, 1800 UTC

Satellite(s) Involved:

Instrument(s) Involved:
All (since all data is synch to the AVHRR)

Product(s) Involved/Affected:
All products

Date/Time(UTC) of Initial Implementation:
18 September 2003, Time 1523 UTC

Details/Specifics of Change:
The Satellite Operations Control Center (SOCC) issued the following notice:

"At approximately 07:00Z on 17 Sept, the N16 AVHRR scan motor current and
synch delta word began to act erratically running up as high as 287 mAmps
nominal 230). As of this writing, it has not returned to a nominal

Engineers are making every attempt to maintain data quality and get us
the hurricane day when there is reduced staffing since the federal
government is
closed. In coordination with IPD representative, G. McCreary, the
immediate plans are to disable rephasing (starting on or about noon local
today) and have the controllers enable rephasing once per shift (on the
available contact per shift that time permits).
Additional work and analysis will follow as the work environment returns to
normal. Operational impacts are: 1) each time rephasing occurs there
will be
a drop in TIP frames (1 or 2 frames) and 2) the pointing of the AVHRR may
not be
as accurate in between times to rephase. Rephase will only occur if needed

during the time it is enabled as mentioned above.

This info could not be published on the Web because the network connections
those machines is currently not operational."

Contact Person(s) Name/Email/Phone Number for Questions:
COB crew PPL (Product Production Leader), 301-457-5264 (over weekend or
during off hours) ext. 117 ext. 129

Web site(s) that contain other relevant information (where applicable): - History of level 1B
notices - All user notices - SOCC polar satellites status - SOCC morning reports