Topic: GOES-15 Visible Calibration Update for the Month of September 2018

Date/Time Issued: September 11, 2018 2322Z

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

Date/Time of Initial Impact: September 11, 2018 0930Z

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

Length of Outage: N/A

Details and Specifics of Change: On 11 September 2018, 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 25 September, two weeks after the implementation date.

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

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: September

Update Year: 2018

Current post-launch calibration coefficient: 1.56008

Date: 2018240000000000

Previous post-launch calibration coefficient: 1.55561

Date: 2018212000000000

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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