Topic:M-B GOES-15 Visible Calibration Update for the Month of January 2020
Date/Time Issued: January 16, 2020 2205ZM-B
Product(s) or Data Impacted:M-BM-B All products from visible channel
Date/Time of Initial Impact:M-BM-B January 14, 2020 0930Z
Date/Time of Expected End:M-B Until Next Month's Coefficient Update
Length of Outage:M-B N/A

Details and Specifics of Change:M-B

On 14 January 2020, 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 28 January, two weeks after the planned implementation date.

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This notification no longer includes updates to the Imager visible channel calibration coefficients for GOES-13, since GOES-13 is no longer GOES-EAST.

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GOES-15:

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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).

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Satellite: GOES-15
Update Month: January
Update Year: 2020
Current post-launch calibration coefficient: 1.64044
Date: 2019365000000000
Previous post-launch calibration coefficient: 1.63456

Date: 2019330000000000
Initial calibration coefficient: 1.0
Initial calibration date: 2001114000000000

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Some definitions:

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

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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.

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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 301-817-4031 operations 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: M-BESPC Operations at ESPCOperations@noaa.gov at 301-817-3880 and/or other contacts as necessary

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