Subject: Administrative: NOAA-19 SBUV Giant Step Commanding, Issued:
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*Topic:*NOAA-19 SBUV Giant Step
*Date/Time Issued: *June14, 2018 1600Z
*Product(s) or Data Impacted:*SBUV Products
*Date/Time of Initial Impact:*June 14, 2018 1615Z
*Impacts on Users and Significance:*SBUV products will be impacted.
*Date/Time of Expected End:*June 14, 2018 1625Z
*Length of Outage:*~10 minutes
*Details/Specifics of Change:*
The NOAA-19 SBUV/2 instrument has experience problems with grating
position selection for Channel 12 since mid-2011.We have attempted to
mitigate this problem by shifting the channel 12 wavelengths,
however in
each case, grating drive errors eventually returned after the
switch was
made.Any further shift to a shorter wavelength would cause significant
problems for the ozone retrieval algorithm. To reduce grating drive
errors, the “giant step” procedure will be used.This sequence
uses rapid
motion of the grating drive over its full range (230nm to 360nm) in an
effort to move presumed contaminants out of the wavelength range
sampled
for ozone data. This test will be run for ~10 minutes before returning
the SBUV to its previous configuration.
*Contact Information for Further Information:*ESPC Operations at
ESPCOperations@noaa.gov
Topic: NOAA-19 SBUV Giant
Step Date/Time Issued:
June
14, 2018 1600Z Product(s) or Data
Impacted:
SBUV Products Date/Time of Initial
Impact:
June 14, 2018
1615Z Impacts on Users and
Significance:
SBUV products will be
impacted. Date/Time of Expected
End: June 14, 2018
1625Z Length of
Outage: ~10
minutes Details/Specifics of
Change: The NOAA-19 SBUV/2
instrument has experience problems with grating position
selection for Channel
12 since mid-2011. We
have attempted to
mitigate this problem by shifting the channel 12 wavelengths,
however in
each case, grating drive errors eventually returned after the
switch was
made. Any further
shift to a shorter
wavelength would cause significant problems for the ozone
retrieval algorithm.
To reduce grating drive errors, the “giant step”
procedure
will be used. This
sequence uses rapid motion of the
grating drive over its full range (230nm to 360nm) in an
effort to move
presumed contaminants out of the wavelength range sampled for
ozone data. This
test will be run for ~10 minutes before returning the SBUV to
its previous
configuration. Contact Information
for Further Information: ESPC
Operations at ESPCOperations@noaa.gov at 301-817-3880 and/or other contacts
as necessary Web Site(s) for
applicable information:
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