NOAA-18, HIR &, APT, APT/HIRS Noise Association Test, TBD- Issued: 16 April 2007; 2110 UTC

Plans to Examine APT transmitter effect on HIRS instrument

Date/Time(UTC) Message Issued:
16 April 2007, 2110 UTC

Satellite(s) Involved:

Instrument(s) Involved:

Product(s) Involved/Affected:
loss of data

Date/Time(UTC) of Initial Implementation:
TBD, once instrument noise is quiet

Details/Specifics of Change:
NOAA's Satellite Operations Control Center (SOCC) has received approval to proceed to test the effect if any of the APT transmitter on the HIRS instrument noise. This test must be conducted when the instrument noise level is quiet. SOCC will monitor the instrument for the next opportunity to conduct this test. The APT and HIRS user community will be impacted by this test as described below. As soon a a definite date is set for the test a notice with details will be sent out to the user community. The following web site contains an up-to-date chart of the current status of the instrument noise:

According to SOCC, "The instrument will be placed in space view for two orbits in order to provide a uniform background and then we will systematically turn-on/off the various transmitters and monitor the noise looking for any noise spikes. We want to conduct the test when the instrument, both Long Wave and Short Wave channels, are in a quiet mode i.e. when the loose lens are not creating noise. When the instrument becomes quiet, SOCC will put the command sequence into the daily schedule. If possible, you will receive notice that SOCC has scheduled the test approximately 24-hours prior to the test being conducted. After the command sequence has been run, the instrument will be returned to full-scan mode."

Contact Person(s) Name/Email/Phone Number for Questions:
Emily Harrod 301-817-3882
Renee Smith-Dearing 301-817-4117

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

* Emily D. Harrod
* Computer Operations Branch
* Pre-Product Processing Group
* E/SP11, NSOF, room 1460
* 4231 Suitland Road
* Suitland, Maryland 20746-4304
* voice 301-817-3882
* fax 301-817-3902
* email