Subject: Administrative: Update #1, NOAA-19 SBUV Giant Step Commanding,
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*Update 1:*The “giant step” function was initialized at 1617Z. It
took
longer than anticipated for the giant step procedure to move all
contaminants out of the full range of the grating drive, the grating
drive motor hadn’t fully driven through the debris by the end of the
pass. The giant step function was allowed to run for two orbits before
commanding it back to the wavelength range used to produce ozone
science
data at 1923Z.
*Topic:*NOAA-19 SBUV Giant Step
*Date/Time Issued: *June14, 2018 2055Z
*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
Update 1: The “giant
step” function was
initialized at 1617Z. It took longer than anticipated for the
giant step
procedure to move all contaminants out of the full range of
the grating drive,
the grating drive motor hadn’t fully driven through
the debris
by the end of
the pass. The giant step function was allowed to run for two
orbits before
commanding it back to the wavelength range used to produce
ozone science data
at 1923Z.
Topic: NOAA-19 SBUV Giant
Step
Date/Time Issued: June 14, 2018
2055Z
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:
N/A
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