Topic: GOES-15
Visible Calibration Update for the Month of April 2018
Date/Time Issued: April 10, 2018 2120Z
Product(s) or Data Impacted: All products from
visible
channel
Date/Time of Initial Impact: April 10, 2018 0930Z
Date/Time of Expected End: Until Next Month's
Coefficient Update
Length of Outage: N/A
Details and Specifics of Change:
On
10 April 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 24 April, 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 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: April
Update Year: 2018
Current post-launch calibration
coefficient: 1.53565
Date: 2018086000000000
Previous post-launch calibration
coefficient: 1.53125
Date: 2018058000000000
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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