Date/Time Issued: March 12, 2019 2100Z

Product(s) or Data Impacted: All products from visible channel

Date/Time of Initial Impact: March 12, 2019 09:30 UTC

Date/Time of Expected End: Until Next Month's Coefficient Update

Length of Outage: N/A

Details and Specifics of Change: On 12 March 2019, the following update of the calibration coefficients, based on post-launch vicarious calibration at NOAA/NESDIS/STAR, was implemented for the Imager visible channel of GOES-15 at 0930Z. These coefficients are intended to be optimal on 26 March, two weeks after the implementation date.

GOES-15: The following update of the calibration coefficients, based on post-launch vicarious calibration at NOAA/NESDIS/STAR, is recommended for the currently operational GOES-15 Imager visible channel. These coefficients are expected to be implemented on the second Tuesday of the Update Month listed below and optimal on the fourth Tuesday of the Update Month (in the middle of the two scheduled updates).

Satellite: GOES-15

Update Month: March
Update Year: 2019
Current post-launch calibration coefficient: 1.58946
Date: 2019057000000000
Previous post-launch calibration coefficient: 1.58490

Date: 2019029000000000
Initial calibration coefficient: 1.0
Initial calibration date: 2001114000000000

Some definitions:

The date format is: YYYYDDDHHMMSSmmm, where YYYY = year, DDD = day of the year, HH = hour, MM = minute, SS = seconds, mmm = msec.

The coefficient provided is a gain that is to be applied to the Visible channel counts-to-radiance conversion

Op_R = Coefficient * Pre_R

where Pre_R is pre-launch gain for the channel and Op_R is the new gain -- the gain after the coefficient listed as "Current post-launch calibration coefficient" is applied.

The initial coefficient has been normalized to 1.0 for the purposes of this post-launch calibration.

Contact Person(s) Name/Email/Phone Number for Questions:
Paul Douglas, jpaul.douglas@noaa.gov, desk phone 301-817-4031operations support
Xiangqian Wu Xiangqian.Wu@noaa.gov <mailto:Xiangqian.Wu@noaa.gov> 301-763-8136 x 138 instrument scientist

Web site(s) that contain other relevant information (where applicable):

http://www.star.nesdis.noaa.gov/smcd/spb/fwu/homepage/GOES_Imager_Vis_OpCal.php

Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov at 301-817-3880 and/or other contacts as necessary

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