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[Datastream #UQE-129922]: GOES 17 gaps at THREDDS server

Hi,

re:
> We've noticed that on most evenings, there's been a gap between about
> 6 UTC and 12 UTC in the GOES 17 images in the THREDDS server (e.g. here:
> 
> https://thredds-test.unidata.ucar.edu/thredds/catalog/satellite/goes/west/products/CloudAndMoistureImagery/CONUS/Channel13/20200228/catalog.html
> 
> during period for which images can be found at
> 
> https://www.star.nesdis.noaa.gov/goes/sector_band.php?sat=G17&sector=hi&band=13&length=96.
> 
> Does this have to do with the heat-pipe issue, which mostly seems to
> impact the water vapor channels around 12 UTC?   Or some other reason?

It does have to do with the heat pipe issue in that NOAA has been
running GOES-17 in Flex Mode 3 - Cooling Timeline between 6 and 12 UTC
since Wednesday, February 26, and will continue thru Sunday, March 1.

Here is one of the announcements that NOAA has issued about this testing
period:

Date:    Fri, 21 Feb 2020 16:02:06 -0500

"Topic: GOES-17 (GOES-West) ABI Mode 3 Cooling Timeline Implementation
 Date/Time Issued: February 21, 2020 2100 UTC
 Product(s) or Data Impacted: GOES-17  ABI Imagery and Level 2 Products
 Date/Time of Initial Impact: February 26, 2020 0600 UTC
 Date/Time of Expected End: March 01, 2020 1200 UTC

 Length of Event: 6-hours each day from 0600 UTC to 1200 UTC and lasting from
 February 26, 2020 through March 01, 2020.  The same timeline will occur
 seasonally in operations for four periods each year.  See details below.

 Details/Specifics of Change: GOES-17 ABI is going to commence permanent
 operational implementation of the Mode 3 Cooling Timeline starting on starting
 Wednesday, February 26, 2020 through Sunday, March 01, 2020 in order to
 mitigate the number of saturated images resulting from the loop heat pipe (LHP)
 temperature regulation anomaly.  The timeline will occur for 6 hours, centered
 on spacecraft midnight from 0600 UTC to 12000 UTC each day. The same timeline
 will occur seasonally in operations for four periods each year. Here are the
 next four full periods, which will repeat each year with minor adjustments
 based on future GOES-17 ABI thermal models:

  • April 09, 2020 - May 01, 2020
  • August 12, 2020 - September 01, 2020
  • October 14, 2020 - October 31, 2020
  • Dates for 2021 are yet to be determined, but will be shared prior to
    January, 2021.  

 The timeline will operate in Mode 3 (“Flex Mode 3” uploaded as timelineID=3)
 where GOES-17 ABI will generate a single full disk once per 15 minutes and
 generate one mesoscale domain sector each minute. Alternating MESO domains will
 be collected one time each per two minute period. The CONUS domain will not be
 scanned during the timeline as those periods will be used for cooling.

 Full Disk product availability will occur every 15 minutes with timestamps of
 HH:00, HH:15, HH:30, and HH:45 (with HH:00 representing data collected from
 HH:00 through HH:15 and HH:30 representing data collected from HH:15 through
 HH:30, etc.) for each hour from 0600-1200 UTC on February 26, 2020  through
 March 1, 2020. Mesoscale domain sector availability will alternate each minute
 between the two mesos (e.g. HH:00 for MESO1, HH:01 for MESO2, HH:02 for MESO1,
 HH:03 for MESO2).  GOES-17 ABI will continue its capability to handle domain
 sector requests during the cooling timeline period. Nominal Mode 6 operations
 will resume at 1200 UTC on each day of cooling timeline operations.  INR and
 radiometric calibration will be maintained throughout the cooling timeline
 periods of activation. The data availability from each distribution service is
 provided below in a format of “Distribution Service: Data Availability”.  

 ----------

 AWIPS (Advanced Weather Interactive Processing System):  

 - 15 minute SCMI (Sectorized Cloud and Moisture Imagery) for Full Disk
 - 2 minute SCMI for mesoscale domain sector “MESO1” and “MESO2” 
 - 15 minute SCMI for Alaska sector (subset from Full Disk)
 - 15 minute SCMI for Hawaii sector (subset from Full Disk)

 GRB (GOES Rebroadcast):  

 - 15 minute L1b Radiances Full Disk
 - 2 minute L1b Radiances for mesoscale domain sector “MESO1” and “MESO2” 

 PDA (Product & Distribution Access System):

 - 15 minute L1b Radiances Full Disk
 - 2 minute L1b Radiances for mesoscale domain sector “MESO1” and “MESO2”
 - 15 minute Level 2 CMI Full Disk
 - 2 minute Level 2 CMI for mesoscale domain sector “MESO1” and “MESO2” 
 - All other Level 2 (non-CMI) Full Disk and mesoscale domain sector “MESO1” and
   “MESO2” products will be produced but may have varied degradation for the
   duration of the cooling timeline and up to 30 minutes *after* nominal Mode 6
   resumes.

 HRIT/EMWIN (High Resolution Information Transmission / Emergency Managers
 Weather Information Network):  30 minute Level 2 CMI Full Disk will be
 broadcast at HH:11 and HH:41. The mesoscale domain sectors “MESO1” and “MESO2”
 will be broadcast.  Level 2 non-CMI products will not be broadcast during the
 defined cooling timeline period.

 GNC-A (GEONETCast-Americas):  GNC-A broadcast of 15 minute Level 2 CMI Full
 Disk imagery will be distributed at HH:01, HH:16, HH:31, and HH:46.  All Level
 2 non-CMI products will not be broadcast during the defined cooling timeline
 period.

 ----------

 The GOES-17 ABI Mode 3 cooling timeline implementation is planned to occur
 despite Critical Weather Day declaration. These cooling timeline activities are
 specific to ABI.  All other GOES-17 spacecraft and instrument (EXIS, GLM,
 Magnetometer, SEISS, SUVI) activities will remain nominal for the duration of
 the cooling timeline. 

 Contact Information for Further Information: ESPC Operations at
 address@hidden or 301-817-3880

 Web Site(s) for applicable information:

 See https://www.ospo.noaa.gov/Operations/messages.html for this and other
 satellite related messages.

 See GOES-17 ABI performance website at https://www.goes-r.gov/users/
 GOES-17-ABI-Performance.html"

re:
> Thanks for your work, and thanks for any information!

You are most welcome.

Cheers,

Tom
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Ticket Details
===================
Ticket ID: UQE-129922
Department: Support Datastream
Priority: Normal
Status: Closed
===================
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