NOAA-18, HIRS Instrument, Various command tests, Implementation Date 25 September 2006- Issued: Date 22 Sep0tember 2006; time issued 18:00 UTC

NOAA-18 to undergo test commands for the HIRS Instrument

*Date/Time(UTC) Message Issued:*
22 September 2006 18:00 UTC

Satellite(s) Involved:*

*Instrument(s) Involved:*

*Product(s) Involved/Affected:*
All products using the HIRS instrument on NOAA-18

*Date/Time(UTC) of Initial Implementation:*
25 September 2006 13:32 UTC

*Details/Specifics of Change:*
In an attempt to stabilize the loose lens on the NOAA-18 HIRS instrument
and improve the data quality the following tests will be performed on
the dates and times indicated:

25 September 2006 at 13:31 thru 13:28 UTC Test #1- Command HIRS mirror
to the Internal Warm Target (IWT) and turn Filter Wheel housing heater
on. This posture will be maintained for 48 Hours.

27 September 2006 at 13:12 thru 13:28 UTC Test #2- The scan mirror will
be commanded to a variety of different positions, with a 32 second
interval between commands. The mirror will be parked at the IWT position
and the Filter Wheel Housing heater will be turned off. This posture
will be maintained for 24 hours.

28 September 2006 13:02 thru 13:17 UTC Test #3- Commence normal scanning.

Again, these tests will performed in an effort to stabilize the loose
lens on the NOAA-18 HIRS instrument and improve data quality.

*Contact Person(s) Name/Email/Phone Number for Questions:*
Emily Harrod
Physical Scientist
301-457-5247 ext 117

Cecil A. Paris,PMP
Physical Scientist
301-457-5247 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

* Emily D. Harrod
* Product Systems Branch
* Pre-Product Processing Group
* E/SP13, Federal Building #4, room 0318
* 5200 Auth Road
* Suitland, Maryland 20746-4304
* voice 301-457-5247 ext 117
* fax 301-457-5199
* email