NOAA-15 and 16, HIRS Visible Calibrarion Update Rescheduled, 5 September 2002 - Issued: 29 August 2002; 2030 UTC

NOAA-15 and 16, HIRS Visible Calibration Update - Rescheduled.

Date/Time(UTC) Message Issued:
29 August 2002 2030 UTC

Satellite(s) Involved:
NOAA-15 and 16

Instrument(s) Involved:

Product(s) Involved/Affected:
Level 1B and 1B*

Date/Time(UTC) of Initial Implementation:
5 September 2002

Details/Specifics of Change:
The HIRS visible calibration update scheduled for August 20 was delayed.
The update is now scheduled for September 5, 2002. A message indicating the
first orbits to be processed after the change will be sent out on September
4. We hope that this change has not created problems for your operations.
Thank you for your patience and cooperation.

***** Following is the original Message sent out on July 24, 2002 with new
date *****
On May 10, 2002, a notice was sent out to the user community announcing
preparations to update the NOAA-15 and 16 HIRS visible coefficients. Test
data is now available on the CEMSCS and anonymous FTP site
( in subdirectory pub\test1b\vicarious). Below is
a list of HIRS 1B test data sets (P1B...) containing NOAA-15/16 HIRS
vicarious coefficients for channel 20 and accompanying GHRR and AMSUA 1B
test data sets as well as corresponding operational data sets (NSS...) that
are available on the anonymous ftp site. This test data will be updated no
more than twice a week unless a request is received for additional data.
Test data on the CEMSCS will run in parallel to the operations.
The changes will go into operations on September 5, 2002.

Below is the new values, current, and prelaunch.
NOAA-15 Vicarious Operation Prelaunch
Slope 0.03174 0.0674 0.02336
Intercept 47.1100 101.0635 36.0500

NOAA-16 Vicarious Operation Prelaunch
Slope 0.02611 0.021354 0.021354
Intercept 62.3307 51.4852 51.4852

From Dr. Cao's notes - "To retrieve the albedo from the HIRS level 1b data,
the following equation should be used:
Albedo = (intercept + slope * C)/cos(z)
Where C is the Earth view count and z is the solar zenith angle for the
pixel. All items are available in the level 1b data."

Contact Person(s) Name/Email/Phone Number for Questions:
Emily D. Harrod/ ext 117

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