Talk:GEOS-5 ADAS Radiance Monitoring

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Please add notes to this section, including anything noteworthy to radiance monitoring, using the + sign above. Examples below show the header (i.e. NPP Launched) and the comment below. It is helpful if you include the date in your comment, following the format: 

*'''DD Month Year''' - Now my comments

so that there is a timestamp beyond the page history.

Observing System Notes

  • 01 November 2011 - This page was generated

NPP Launched

  • 28 October 2011 - NPP was successfully launched.

Test Comment

  • 1 November 2011 - This is a test message.

Aqua AMSU-A change starting 18z Sep 21 2011

  • 3 November 2011 - There was a change in the bias correction and number of radiances accepted for Aqua AMSU-A toward the end of September 2011. A closer check showed the bias correction adjusted starting at 18z Sep 21 2011. The mean (O-F) and (O-A) increased to -0.2K and normalized cost also increased. In the ana.log files after that point, it shows we are reading AMSU-A data from both the 'airsbufr' and 'eosamsuabufr' files while prior to that date there was no AMSU-A data read in from the 'airsbufr' file. We found that AMSU-A data is now written in the 'airsbufr' file; this change in input is likely related to the change in statistics. Operations staff have been alerted and they are currently investigating.
  • 3 November 2011 - Update - our upstream provider had applied an update to their processing package back in September which added the AMSU-A data to the AIRS data file. OPS configuration is being modified not to try to read AMSU-A from the AIRS data file, and we have also asked our data provider to revert to our prior configuration.
  • 7 November 2011 - It looks like the statistics (bias correction and o-f mean) have moved back toward their previous values.

N15 outage 11/29/11

  • 29 November 2011 - Noted a dropout of N15 data on 11/29/11 - pertinent message here:

NOAA-15 Gyroless Baseline On-Orbit Test

Aqua AIRS and AMSU-A data dropoff 28 Nov - 1 Dec

  • 2 December 2011 - There were problems with data starting on 28 Nov due to a problem with communications from the Norway ground station.

Subject: Re: AIRS NRT data gaps starting from 11/29/2011........
From: "Budala, Sandeep S. (GSFC-610.2)[Affiliate]" <sandeep.s.budala@nasa.gov>
Date: Tue, 29 Nov 2011 16:07:37 -0600

Hello All,

Be advised the communication lines between GSFC and Norway were severed yesterday at @ 332/11:43:17GMT due to a undersea cable anomaly. The Aqua spacecraft are currently utilizing on-board automation to continue to playback the science data at Norway and utilizing other ground stations to capture the X-Band (science) data. Due to the data not able to be transmitted from Svalbard, Norway there will be an impact to science data latency to end users. The missions are at a higher than normal risk for incurring a data loss due to this anomaly.

Thanks!

Sandeep

GOES-15 replaces GOES-11 as operational satellite

NOAA-17 HIRS3

  • 12 Dec 2011 - Per Ron Gelaro's email - NCEP staff noted an increase in noise from NOAA-17 HIRS. The change is noticable on the monitoring change as a sudden change in mean and std. deviation of O-F, and a dropoff in the number of accepted obs, starting with the 00UTC analysis on 4 December. We are following NCEPs lead in turning off N17 HIRS, effective as of 12UTC Dec 12 (today). The active_channels.tbl in the GEOS tag is being modifed to reflect turning off data from this satellite effective 00UTC Dec 4. The NCEP GSI and NAM turn off N17 HIRS as of 18UTC on Dec 13.

From the SSD message: On December 3, 2011 (DOY 337) at 21:25Z, there was an increase in the NOAA-17 HIRS filter motor current and temperature. The motor current increased approximately 20mA to 170mA and later dropped back towards its previous level. There was a few tenths of one degree increase in filterwheel temperature. This anomaly, considered as a sign of aging of the HIRS filter motor, mainly affects the HIRS longwave channels. These channels have escalated but stable noise levels.

  • 28 Jan 2013 NOAA-17 HIRS Outgas Test several orbits of lunar view Space Look data will be collected surrounding an extended duration outgas. The associated data outages will not impact GEOS-5 since N17 HIRS3 is no longer used.

COSMIC FM2 GPS RO

  • 5 Jan 2012 - Though I haven't found anything explicitly mentioning the permanent demise of COSMIC FM2, it does agree with GFS Monitoring that observations ceased at at 12 UTC cycle on 28 Dec 2011. These things sometimes come back to the data stream, but usually quicker it happens quicker than this. FM6 seems to be erratically dropping out, but was actually somewhat healthy in most recent cycles.
  • 23 Jan 2012 - FM2 data has still not returned.
  • 1 Mar 2012 - it appears that the COSMIC FM2 data has reappeared as of 12UTC 8 Feb 2012, mainly in upper levels.
  • 14 Mar 2012 - Now COSMIC FM4 has been out of the picture for a while - since around 1 March
  • 20 Mar 2012 - COSMIC FM4 is back
  • 9 Aug 2012 - note that COSMIC FM2 dropped out since late July. COSMIC FM4 is back after an outage in early July though.
  • 14 Aug 2012 - COSMIC FM2 back for a few days now. FM4 is spotty. C/NOFS missing since around 8 August, back on 16 August.
  • 09 Dec 2014 - COSMIC GPS update - Last COSMIC FM2 data seen on 2014-10-16. COSMIC FM4 missing since 2014-11-26. Last data dates are consistent with dates shown on recent occultation maps on COSMIC site.
  • 02 Feb 2015 - COSMIC FM4 data returned 2014/12/29 18z, dropped out again after 2015/1/12 00z; COSMIC FM2 data returned 2015/01/16 00z, may have dropped out again 2015/02/01.

WindSat Outage

  • 23 Jan 2012 - There has not been any WindSat data assimilated in our system since around 1/11/2012. If you check out NRL's WindSat page (http://www.nrl.navy.mil/WindSat/) it does look like observations from the outage period have been taken. WM is investigating further.
  • 6 Feb 2012 - There is a new format for distributing WindSat data and that "can be or not", according to Dennis Keyser from EMC, the cause of the outage. They are planning to do transition from 1.9.6 to 2.6.x format soon and they don't plan to process missing data. (DM)
  • March 15, 2012 - Data counts at NCEP back to normal. According to Dennis Keyser problem was that in the raw files was missing model wind speed and for that reason data were tossed.(DM)
  • 9 Aug 2012 - No WindSat data assimilated since 8/4/12 18z. From earlier correspondence: 'through email from Tom Lee at NRL...confirmed by Kim Richardson at NRL that WINDSAT processing will be discontinued this August due to lack of O&M funding.'
  • 16 Aug 2012 - Dennis Keyser suggests that the old 1.9.6 processing at NRL is discontinued and NCEP needs to update to the new 2.x.y format to restore the WindSat data flow

GOES-13 sounder SW bands noise

A NESDIS message mentions increased noise and striping on products in the shortwave bands (channels 13-16). Current OPS is not using G-13 radiance data, we will need to keep aware of this if we decide (as NCEP has) to assimilate the data in the new system.

MetOp-B launch

GOES-13 Outage

  • 24 Sept 2012 GOES-13 Imager and Sounder are suffering from increased noise. As a result, the platform has as of this day been pulled out of GOES-East operations. GOES-14 is being prepped to take over GOES-East ops. The Engineers continue to investigate, a return to service timeframe, if possible, is unknown. [1]
  • 16 Oct 2012 Tests of GOES-13 instrumentation have demonstrated the imager and sounder are ready to return to GOES-East operational service. GOES-13 Imager data are nominal and thanks to outgassing activities the noise in GOES-13 Sounder shortwave data has been reduced compared to pre-anomaly levels. The return of GOES-13 to operational service also optimizes the long term continuity of the GOES constellation. On October 18, 2012 at 1444 UTC GOES-13 data will be inserted back into the GOES-13 GVAR data stream, replacing the current GOES-14 data stream. Users do not need to repoint their antennas as the switch of GVAR data streams will be transparent. Users will notice the immediate shift of Earth coverage from the current GOES-14 drifting position to the GOES-13 position at 75 degrees West longitude. GOES-East products will be generated using GOES-13 and will receive nominal 24x7 monitoring. [2]
  • 18 Oct 2012 Additional information: GOES-13 returned to service as GOES-East today, Thursday, October 18 at 10:44 AM EDT. All operations are nominal. The root cause of the GOES-13 anomaly was a motor vibration in the sounder filter wheel subsystem that was transmitted on to the imager and sounder optical bench. Mitigating steps have been taken to suppress the vibration and in addition, outgassing of the sounder has improved the sounder detector performance. [3]
  • 12 Jun 2013 GOES-13 stopped producing imaging and sounding data at 0340 UTC May 22 2013 due to an anomaly believed to be a micrometeoroid strike on the arm for the solar array panel. GOES-15 initially provided additional coverage of eastern US, followed by activation of GOES-14 during the outage while engineers analyzed the cause of the anomaly. GOES-13 returned to service at 1545 UTC June 10 2013. SSD message NOAA press release NOAA press release

NOAA-18 SBUV outage

  • 13 Dec 2012 At approximately 08:05 UTC, December 12, 2012, NOAA-18 SBUV Chopper Motor stalled resulting in a sudden increase in current and temperature. This anomaly occurred December 12, 2012 , rendering the SBUV instrument inoperable. Engineering is working on the problem but does not expect any improvements in the near term. NESDIS message

Meteosat-10 replaces Meteosat-9 as operational satellite

scheduled to take place 21 Jan 2013 at 09:45 UTC EUMETSAT web page

  • 22 January 2013 - The changeover has taken place. Met9 winds stop and Met10 winds start with the 1/21 12UTC 'prepbufr' and 'satwnd' files and likewise for SEVIRI radiances in the 'sevcsr' file.

NOAA-17 decommissioning

  • 8 Feb 2013 from the NCEP RFC_MEMO_20130208: "The NESDIS Office of Satellite Products and Operations (OSPO), is in the process of briefing NESDIS management and the National Weather Service Headquarters on a proposal to terminate NOAA-17 from operations due to problems with the spacecraft. No formal notification will be made until the recommendation and supporting rational have been briefed to these groups, and decommissioning of NOAA-17 is approved. At this time, the proposed date to decommission NOAA-17 is March 18, 2013."
  • 3 Apr 2013 update on date of NOAA-17 decommissioning - 10 April 2013
  • 11 Apr 2013 from SATOPS Morning Report: Wednesday, April 10, 2013 - "At 12:17z Engineers successfully decommissioned NOAA 17. Operations included: turning off all transmitters, disconnecting batteries, opening thruster valves to deplete nitrogen, and off pointing the solar array from the Sun."

MetOp-B replaces MetOp-A as EUMETSAT's prime operational polar orbiting satellite

  • 24 Apr 2013 On 24 April 2013 at 12:00UTC EUMETSAT will transition operational services from MetOp-A to MetOp-B. MetOp-A data will continue to NOAA on a best effort basis and with out the timeliness benefits of half orbit dumps at McMurdo. NESDIS message [EUMETSAT press release www.eumetsat.int/Home/Main/News/Press_Releases/832312?l=en]

NOAA-19 HIRS degraded, disabled

  • O-F standard deviations were seen to rise, and an RFC memo circa 3 Jul 2013 stated that NCEP had turned the instrument off. As of the 12z run on 5 Jul, the observations were disabled in forward processing & FPIT. The spike in the radiance monitoring plots is likely due to the software being confused regarding used/rejected data when they switch to passive.

NOAA-15 AMSU-A data dropoff

  • 22 Aug 2013 NOAA-15 AMSU-A data counts and coverage decreased (first signs ~16 Aug 18UTC) with loss of data spreading southward from the Arctic. Per email from Nigel Atkinson (UK Met Office) this was due to erratic reporting of the A1-2 antenna position for the warm calibration view. The Warm Target View Position Tolerance for NOAA-15 AMSU-A was updated on 21 August 2013 at 1248 UTC, followed by a subsequent recovery of data counts and coverage.

Meteosat 10 SEVIRI decontamination 14-21 Jan 2014

Scheduled Decontamination of Meteosat-10 SEVIRI Instrument 14-21 Jan 2014. During the period Meteosat 9 image data will replace the primary Meteosat-10 service. The EUMETSAT winds are from Meteosat 9, starting from 12UTC 14 Jan 2014, and there is no SEVIRI radiance data. The SEVIRI data returns in the 06z files on 21 Jan. The 06z BUFR files also contain winds from both Meteosat 9 and 10, with Meteosat 10 wind data only in subsequent files.

AQUA AIRS outage

  • 25 Mar 2014 NESDIS message ESPC received an email from NASA reporting that the AIRS Instrument has encountered an anomaly as of March 22, 2014 17:27 UTC. ESPC is still not receiving Aqua Airs data. AIRS NRT data will not be available until further notice. From the airs.jpl website: "On March 22, the AIRS instrument experienced an anomaly related to one of the active cryocoolers used to cool the infrared detectors. We have temporarily disabled data production as we evaluate the cause of the anomaly and the corrective action."
  • Data returned in the 29 March 2014 00 UTC bufr file.

NOAA-16 decommissioning

  • 10 June 2014 NOAA-16 was decommissioned on June 9, 2014 at 14:23 UTC due to major spacecraft anomaly.The last fully successful contact of NOAA-16 was on 6 June at 00:55UTC. NESDIS bulletin

MetOp-A AMSU-A Ch 8 turned off

  • 29 August 2014 AMSU-A Channel 8 has deteriorated over time, and was shut off in fp as of 30 Aug at 00 UTC

NOAA-15 AMSU-A Ch 6 turned off

  • 17 October 2014 Channel 6 on N15 has degraded and was turned off in FP effective 18 October 2014 at 00 UTC. In MERRA-2, it was turned off effective 1 Sept 2014.

GOES-15 increasing obs error and O-A & O-F since late Sep 2014

  • 19 Nov 2014 There are increasing mean O-A and O-F values as well as observation errors for GEOS-15 SNDR-D1 channels 3-8, SNDR-D3 channel 8, and SNDR-D4 channel 8. These abnormal values occur after the GEOS-15 Yaw Flip Maneuver between September 23-24, 2014. Here is the note about the maneuver http://www.ssd.noaa.gov/PS/SATS/SPBULL/MSG2651634.01.txt.
  • 9 Dec 2014 Still keeping an eye on this issue. New scan mirror emissivity coefficients for GOES-15 Sounder were to have been installed December 4. According to the announcement: "Upon this changeover users can expect to see small improvement in accuracy of the GOES-15 (GOES-West) Sounder calibrated radiances, most noticeably on channel 8 (11 um band)."

SSMIS F19 data improperly sneaking in as F17

  • 10-11 Dec 2014 There was a noted degradation in all stats for F17 in this period. Email correspondence from NRL (Ben R. & Steve S.) and FNMOC indicated that F19 data improperly slipped in to the F17 slot. It appears to have been corrected. on ECMWF's page, but as of writing (AM on Fri 12 Dec), obs2html hasn't passed the point of correction.

Metop-B AMSU-A Channel 5 dropouts circa 8 Dec 2014

NOAA 19 AMSU-A data dropoff 12-17 March 2015

  • 16 March 2015 An increasing amount of scan line dropouts on the descending (afternoon) part of the orbit in the southern hemisphere was noted, along with an increase in the amount of data failing calibration (as shown by a plot at the ICVS site). The data count dropoff started around the 12th of March.
  • 18 March 2015 Data counts and coverage appears to be back to normal as of 18UTC on March 17.

MetOp-A IASI Outage 9-15 April 2015

  • 9 April 2015 From Eumetsat Weekly Operations Schedule: 09 April 2015 - 15 April 2015 Metop-A - IASI Instrument Management System switch to B side. IASI GDS Level 1C and Level 2 products will not be available during this period.
  • 13 April 2015 IASI radiances from MetOp-A (with a few gaps) appear starting with the 20150413/12z BUFR file.

MetOp-B IASI Outage 30 June - 03 July 2015

  • 30 June 2015 From Eumetsat Weekly Operations Schedule: "30 June 2015 09:03 UTC - 03 July 2015 12:00 UTC Due to essential instrument activity, all IASI products from Metop-B in the Metop Global Data Service and Regional Data Service will not be available." No MetOp-B IASI data in the 150630.t12z file.
  • 6 July 2015 Data returned (partial orbit) in 150702.t12z file, and present since then.

SSMIS F18 oscillator failure

  • The F18 SSMIS temperature channels started exhibiting problems from about 28 June 2015 1200UTC - reportedly due to a failure of the 56.4GHz oscillator. The data appeared to stabilize from 9 July but became unusable again from ~31 July.

SSMIS F17 problems

  • There were problems with the SSMIS F17 temperature channels on 6 August 2015 with missing data for all channels at 06UTC and data mostly missing at 12UTC. Channel 3 shows a large bias after 12 UTC 6 August so the data was subsequently unusable.

Brief outages

GOES-15 outage 21-23 Mar 2012

  • 22 Mar 2012 - GOES-15 outage starting March 21, 2012, 2045 UTC. See announcement on NESDIS SSD page GOES-15 went into a sun acquisition mode and is unable to do any imaging. This does not impact radiance assimilation since we do not currently use GOES-15 but it will impact the satellite-derived cloud-motion wind vector data.

Update - the problem has been isolated; estimated return to service NET 1600 UTC on Friday, March 23, 2012. GOES-W IR cloud-motion wind data were used in the 18z 23 March 2012 analysis.

MetOp-A dropoff 24-25 Jul 2012

  • 1 Aug 2012 - noted a dropoff in MetOp-A data (HIRS and AMSU-A) around 25 July. NESDIS message mentions a network upgrade at Darmstadt.

Satellite data missing 18UTC 10 Oct 2012

  • 11 Oct 2012 - looks like a lot of satellite radiances are missing, per the coverage plots & from counts in 'ana.log' listing for 18UTC 10 Oct 2012. There is a NESDIS message about the ESPC DDS server being down for several hours (October 10, 2012 1600 UTC - October 11, 2012 0059 UTC) that may have been related to the outage.

Aqua AIRS outage 8-10 Feb 2013

  • 11 Feb 2012 - AIRS outage 8 Feb 21:32 UTC - 10 Feb 01:15 UTC (1 day, 5hrs). On February 8, 2013 at around 21:17:32 GMT the EOS Aqua AtmosphericInfrared Sounder (AIRS) Instrument Scanner entered Shut-down Mode. Interruption to routine science data collection by the AIRS Instrument. No impact to spacecraft bus operations or the other functioning Aqua instruments. An Anomaly Resolution Team (ART) was assembled that included the JPL AIRS IOT and Project Manager, the Aqua FOT, ESMO Management and the Aqua Mission Director. A recovery plan was developed, approved and implemented on Saturday, February 9, 2013. The AIRS instrument was returned to its normal operating mode approximately 8:15pm EST.

SEVIRI/M10 Data outage 1-9(expected) July 2013

AIRS Ch 321 Noise Increase around 19 Sep 2013

  • sidb updated to remove data

MetOp-A IASI outage 5-8 Nov 2013

  • 8 Nov 2013 - The instrument is uploading a new software version to the Instrument Management System during which time all products from Metop-A IASI in the Metop Global Data Service and Regional Data Service will be unavailable. Start November 5, 2013 0700 UTC, expected end November 8, 2013 1700 UTC.

Metop-A data unavailable at Nov 12th 1212UTC

Due to a MetOp-A Satellite anomaly, MetOp-A Instrument data are unavailable from sensing time 12:12 on DOY 316 to 16:41UTC. Returned shortly thereafter (wm update)

OMI total column ozone data were not assimilated between March 2nd-3rd.

AURA OMI total column ozone data were not assimilated between March 2nd-3rd. The assimilated data numbers came back to the normal range afterward.

AIRS data outage March 22.-29., 2014

  • From NOAA Special Bulletin: AIRS Instrument has encountered an anomaly as of

March 22, 2014 17:27 UTC. AIRS NRT data is not be available until further notice.

  • Data came back March 29.

METOP-A MHS data not available from March 26th to May 21st 2013

  • On 26 March 2014, at 08.40 UTC, the MHS instrument on Metop-A entered into a fault mode during preparations for

the out-of-plane maneuvre. Attempts to recover the instrument have so far not been successful and the anomaly investigation is focusing on the possible failure of a hardware switch on the instrument. The instrument is to remain OFF until a better understanding of the problem allows further diagnostic commanding to be performed. This is not expected before mid-next week and the data service could remain off for considerably longer. ESPC stopped receiving the Metop-2 MHS instrument data from EUMETSAT. Technicians are currently investigating this outage.

  • update on April 4: *Eumetsat reports that data will be restored in about 2 weeks.
  • The recovery has been completed. Dissemination of L1B products resumed on 21 May 2014 starting from 9:30 UTC sensing time. Product quality is nominal for all five channels.

Metop-A IASI Decontamination 8 - 12 September 2014

  • 08 September 2014 08:12 UTC - 12 September 2014 12:00 UTC Metop-A - IASI Decontamination IASI GDS Level 1C and Level 2 products will not be available.

SEVIRI/M10 Data outage 2-9 December 2014

  • 4 Dec 2014 - The satellite is undergoing a decontamination procedure. Should return 9 December.
  • 8 Dec 2014 - EUMETSAT switched back to Meteosat-10 to support primary geostationary operations today, December 8, 2014, at

0930 UTC; see Early Completion of Scheduled Decontamination

MetOp-A, B AMSU-A and IASI data dropoff

  • 12 Dec 2014 - There appears to be a data dropoff in these data types beginning 10 December. It could be similar to the dropoff in November 2014 around the same time of the month. The dropoff is also seen in NCEP radiance monitoring but not at ECMWF. Coverage plots show gaps in orbits over various locations (Americas, Asia). 12/11/2014 06z obsplot coverage shows complete coverage of MetOp-A, nearly complete for MetOp-B.
  • 24 Dec 2014 - After the outage mentioned above there were still occasional dropouts of scans for MetOp-B AMSU-A channel 5. The dropouts increased after about 12/16 and the extent of missing brightness temperature increased over the next few days. It looks like this had been corrected on 23 Dec and coverage on 24 Dec 00z appears normal. As mentioned above, the data was not lost at the European centers (namely ECMWF and MeteoFrance) so the data is probably recoverable.

DMSP SSMIS outage

  • 15 Apr 2015 - A power outage at FNMOC/Monterey impacted reception of DMSP SSMIS data. Data outage was April 14 0800-2030UTC. We have no data in the 20150414 06,12,18z files and an excess of data in the 20150415/00z SSMIS data file. The 20150415/00z SSMIS data file appears to contain data beginning around 4/13 2215 (for f18) so the missing times could perhaps be recovered if desired.

MetOp-B IASI Outage 30 Jun - 2 Jul 2015

  • 1 Oct 2015 - Data unavailable due to instrument maintenance.

MetOp-B MHS Outage 18 Sep - 21 Sep 2015

  • 21 Sep 2015 NESDIS Message reported "Due to a Metop-B MHS instrument anomaly, MHS data is unavailable from sensing start time 00:47 on DOY 261 until further notice. Recovery information shall be distributed as soon as it becomes available."
  • 21 Sep 2015 Update #2 "The Metop-B MHS instrument anomaly reported on DOY 261 has been rectified and the MHS data is available again." as of September 21, 2015 1528Z

IASI Metop-B Decontamination

  • 27 June - 2 July (or so) 2018. Scheduled decontamination has resulted in no data. EUMETSAT UNS #3872

A decontamination of the SEVIRI instrument on board Meteosat-10 (expected)

  • 08-14 Dec 2015


NOAA 18 AMSU-A Channel 5 and 8 degrading

  • 6 Oct 2015 - channel 8 switched off (as of 9/23/15 00z), channel 5 is under watch
  • Update 13 Oct 2015 - channel 5 degraded and is going to be switched off today at Oct13 2015 12z for fp

NOAA 15 AMSU-A Channel 5

  • 19 Oct 2015 - count dropping, bias growing, ... closely monitoring statistics, it is important for MERRA runs.

AIRS Channel 375

  • 10 Nov 2015 - AIRS Channel 375 (GSI ch 117) disabled from this point forward. MERRA-2 radiance monitoring shows inconsistent performance dating back to 1 Feb 2013, so in addition to the disabling from this point forward, the channel is disabled starting 1 Feb 2013 in active_channels.tbl corresponding to the head of the trunk (r1.56)

AIRS, IASI, and CrIS Channels Sensitive to Hydrogen Cyanide

  • 10 Nov 2015 - AIRS channel 221 (GSI ch 94), CrIS channel 101 (GSI ch 32), and IASI channels 113, 114, and 115 (GSI ch 113, 114, and 115, respectively) have all been disabled due to sensitivity to HCN. See this slide and ITWG email from Fiona Smith dating 9 Nov 2015.

GOES-13 (GOES-East) Sounder IR Data Outage

  • 20 Nov 2015- GOES-13 (GOES-East) Sounder instrument is experiencing an anomaly. Engineers are investigating the problem.
  • The filter wheel stopped moving so data was not being scanned. The final data for the sounder is 20 Nov 2015 9:22am.

MetOp-B IASI outage 25 Nov - 30 Nov

  • 2 Dec 2015 Noted there was no IASI MetOp-B data between 12z 20151125 and 06z 20151130. No NESDIS SSD bulletins, did not see any information at EUMETSAT about the outage. However the data gap is also apparent in the ECMWF observation time series charts.

MetOp-A and -B GPS GRAS improvement

There was a substantial decrease in RMS (O-F) about 5 July. The announcement Upgrade of NRT production at EUMETSAT and ROM SAF noted that "The NRT production for Metop-A and B has been upgraded on July 5, 2016 as previously announced."\

MetOp-A & B IASI calibration 22-23 Aug 2016

Eumetsat announced "IASI External Calibration (Moon Intrusion). Short interruptions can be expected." from 8/22 02:51 to 8/23 02:12. There were however fairly large portions of the swaths missing in the Northern Hemisphere. The data coverage appeared to go back to normal 8/23 06z.

Sept 2016 Aqua anomaly (both AIRS & AMSU-A)

  • 24 Sept 2016 AIRS disabled due to bad data from 25 Sept 2016 (and missing data 26-28 Sept). Data received on 25 Sept was 'non-scientific'. AMSU-A detector A1, responsible for channels 1 & 2, has been disabled since 18 UTC cycle, 24 September. It remains off as of this update. satinfo.db's are updated to reflect these in FP and REANL systems.
  • 28 Oct 2016 Follow up that the A1 detector is still seemingly bad. AMSU-A remains off in FP and REANL systems

October 2016 Metop-B ch. 15 failure/issue

  • 17 Oct 2016 Midway through the 00 UTC analysis on 17 Oct 2016, channel 15 on AMSU-A Metop-B appears to have failed. As of the failure, the GSI rejects the entire footprint in the event of a channel 15 failure (as well as other channels for various instruments). In terms of assimilation methodology, the selection and assimilation of channels 7-14 over water (where ch1,2 < 285 K) has no specific dependency on Ch. 15. Two steps forward have been done/are underway:
    • For MERRA-2, a specific hook allowing the assimilation of channels 7-14 over water w/ ch1,2 < 285 K to be assimilated. (implemented in MERRA-2 as of calendar day 28 Oct 2016. Rob has, as of writing, not yet rewound/restarted MERRA-2 w/ the fix. A slight overlap period will be analyzed.
    • For FP-onward systems, NCEP has a ticket (#612) relaxing the round-rejection/read cycle in read_bufrtovs. Meta is investigating these changes to ensure that they were not overly-broad.
    • It is also noted that no updates to the satinfo.db have yet been committed. For MERRA-2, it shouldn't be necessary w/ the fix (since the changes will be in place prior to the failure. Even if no explicit turn-off is deemed necessary, a comment in the active_channels will likely be useful.

8 March 2017 New S-NPP ATMS calibration

  • On March 8, 2017 at 15:00 UTC NESDIS transitioned a new S-NPP/GCOM-W1 data processing/distribution systems to operations. This change incorporated updates to the ATMS calibration, resulting in a change in bias in the radiance measurements. Data processed with the new calibration apparently was included starting with the 12z March 8 ATMS file.
  • The GEOS-5 FP system responded immediately to the change by adjusting the mean term in the radiance bias corrections so there was no lasting effect in the observation statistics for bias-corrected channels. Channel 15 (not bias corrected) (O-F) flipped sign and was slightly improved.

IASI MetOp-B non-linearity correction change 2 Aug 2017

  • (User Notification Service message 3034) IASI TOP upload (on-board processing update). This update will improve the non-linearity correction for Metop-B IASI. An improvement of product quality will be seen in band 1 and can reach 0.2K, depending on scene temperature, pixel number and wavelength.
  • The GEOS-5 FP system responded immediately to the change in the 18z analysis by adjusting the mean term in the radiance bias corrections so there was no lasting effect in the observation statistics for the affected channels. There was also a small adjustment in some MetOp-A IASI channels at the time of the change which quickly diminished.

IASI MetOp-A outage 22-23 Aug 2017

  • Data outage between 10:17 UTC 22 August and 11:46 UTC 23 August

SNPP data outage 4-6 Oct 2017

  • Monitoring staff noticed that SNPP data (ATMS and CrIS data) were missing during this period. A shorter outage on 10/4 was reported in the NESDIS messages and data resumed at the ICVS site but NCEP (and we) were missing data after that - the outage was from about 15z on 4 October until around 18z on 6 October. The reason for the longer outage is unknown but may have been a distribution problem.

NOAA-19 MHS Outage

  • 9 October 2017 NOAA-19 MHS (Microwave Humidity Sounder) experienced an anomaly starting on 9 Oct 2017 (17/282) at ~0425 UTC. There were numerous alarms observed in real-time and it appeared that the MHS data was "stale". EUMETSAT has investigated and confirmed the MHS is OFF. The NOAA-19 MHS brightness temperature is set as passive in our assimilation system so there has been no impact due to this outage.
  • 16 October 2017 On October 16, 2017 the MHS instrument was commanded to its operational mode and calibrated. It is now producing science data as of 17:31:08Z. (13:31 EDT). The instrument if fully recovered but the root cause of the anomaly is still under investigation by Engineering.

GOES-16 operational as GOES East December 14, 2017

  • GOES-16 Drift and Transition Plan posted. GOES-16 will drift eastward to 75.2 degrees West starting Nov 30 and ending Dec 11 2017. There will be three days of calibration activity and then GOES-16 will resume nominal operations and officially become GOES-East. There will be a three week period of overlap with GOES-13. GOES-13 will remain at 75 degrees West until Jan 2 2018 when it begins drifting to its storage location.
  • Satellite winds from GOES-16 appeared in the NCEP satwnd files starting 12z 20171221. The termination of GOES-13 products was delayed due to CWD, The final satellite winds from GOES-13 were in the 20180108 12z satwnd file.
  • The GOES-16 satellite winds are written in a newer BUFR format. The FP system was modified to handle the new wind format, and for MERRA2 and RPIT (DAS 5.12 systems) the GOES-16 winds are being rewritten in the older GOES-13 format so they can be assimilated without modifying and recompiling the DAS. The earlier systems had already been using a modified satwnd file with time windowing of the winds to reduce data volume.

Meteosat-11 to replace Meteosat-10 as primary FES spacecraft February 2018

  • The timeline for transition between Meteosat-10 and Meteosat-11 as primary Full Earth Scan (FES) spacecraft is given on this webpage. Modifications to the GEOS DAS will probably be minor.
    • 6 February 2018 - Start of Meteosat-10 and Meteosat-11 parallel image data and Meteorological product dissemination (with Met-10 as primary FES)
    • 20 February 2018 - Meteosat-11 becomes prime FES spacecraft. Parallel Meteosat-10/11 data dissemination continues.
    • 6 March 2018 - Meteosat-10 FES image data and product dissemination stops.
  • The radiance data in our BUFR files for Meteosat-11 begins 20180214 06z. The observation counts appear to be split between Meteosat-10 and Meteosat-11 (total obs = former count for Meteosat-10). The radiance data for Meteosat-10 ends 20180306 12z, with Meteosat-11 continuing. The Meteosat-10 data returned after 20180313 06z with a full count of the data for Met-11 and nearly 50% of Met-10 data.

ATMS NOAA-20 data start

  • 13 Apr 2020 - it does not look like we recorded the start of NOAA-20 ATMS on this page. It looks like our stream started 2018/05/10 12z or thereabouts. This is mainly for future reference.

Aqua AMSU-A ch 14 failure

  • At the NASA Sounder Team meeting it was announced that ch 14 on AMSU-A Aqua failed on 21 Jun 2018. All channels for this instrument were turned off in September 2016 when the A1 detector failed so there was no impact on our assimilations.

GOES 17 now operational GOES-West

  • 12 February 2019 Link GOES-17 will become operational as the GOES-West satellite on February 12, 2019 at 1800 UTC. GOES-17 and GOES-15 will operate in tandem from their respective locations of 137.2 degrees west and 128 degrees west through early July 2019. After July 2019, GOES-15 data distribution will conclude while GOES-17 data distribution will continue for the GOES-West assignment.
  • Information on GOES-17 ABI performance including Loop Heat Pipe information and predictive saturation dates/times can be found at https://www.goes-r.gov/users/GOES-17-ABI-Performance.html
  • 13 February 2019 As of this date the GOES-15 data (Sounder radiances and satellite winds) are still in our input stream and no GOES-17 data is in the SATWND files. We will keep an eye on the input stream but do not anticipate any problems if/when we transition to GOES-17.
  • GOES-17 data begins in the GDAS SATWND input files as of 7 November 2019 06 UTC.
  • 4 March 2020 GOES-15 Sounder radiances and AMVs no longer in the input stream as of 00 UTC 3 March 2020.

MetOp-C GPS-RO

  • Data appeared in our input files starting 7 March 2019 06z

SNPP CrIS Mid-wave failure

  • 1 April 2019 On March 26 2019 1800UTC The SNPP Cross-track Infrared Sounder (CrIS) MW (Mid-wave) region (band 2) started tripping quality flags and resulting in fill data for that portion of the spectrum. The SW (Short-wave) and LW (Long-wave) IR (Infra-Red) regions are nominal. Engineers and the CrIS instrument vendor are analyzing available information to determine whether the root cause is related to a MW signal processor board issue.
  • The issues with the S-NPP band 2 have affected distribution of the whole spectrum due to QC checks in the processing that produces SDRs. A fix to allow distribution of the SDRs even when band 2 is compromised should be implemented within a week. The long term proposal is to switch to "Side 2" of the instrument to attempt to regain band 2. This will require an outage of CrIS S-NPP data for around one month.
  • The CrIS NPP data returned 4/16/2019 18UTC. At that point the data for the mid-band channels was filled with missing values. We did not make any changes to the operational or MERRA-2 assimilation setup although it may have been better to have set the mid-band channels as passive.
  • The switch to the "Side 2 electronics" was carried out June 24, 2019 at 1332 UTC. It had been expected that the data would be cut off after the switch but we continued receiving it and did not initially notice the changeover. The active_channels.tbl change to make CrIS_NPP passive was added to f522_fp on 6/28/2019 at 12UTC.
  • A copy of the active_channels.tbl was created to be used in future tags, that set the mid-band channels as passive starting March 26, 2019 and turns off all data starting at the time of the switch to side 2. This table is being used in the GEOSadas-5_25 tag.
  • At this point we are looking at the side-2 data and will make a decision later on when to turn it on again.

IASI MetOp-A outage 2-8 July 2019

  • MetOp-A IASI data not available from 2019/07/02 09:00 to 2019/07/08 09:00 due to scheduled External Calibration and instrument-decontamination.

MetOp-A outage 30 July - 6 Aug 2019

  • A satellite anomaly occurred with MetOp-A starting 11:54 on 30 July. Data from all instruments (GRAS, AVHRR, ASCAT, AMSU-A, MHS, HIRS and IASI) were unavailable until 6 August. By 12 UTC 6 August all data except for IASI had resumed. The IASI data resumed in the 06 UTC dataset on 9 August.

MetOp-C AMSU-A, MHS, and GOES-17 satellite winds added to datastream 17 Sep 2019

  • NCEP implemented v3.8.3 of their obsproc_satingest package on 17 Sep 1400UTC. AMSU-A and MHS data from MetOp-C, and GOES-17 satellite winds are available starting with the 12z files.
  • 10 June 2021 - It does not look like the start of MetOp-C AVHRR was recorded. The data starts 9 Dec 2019 18z, in association with RFC 6290 obsproc_satingest.v3.9.0.

MetOp-A IASI data problem 21 Aug - 23 Sep 2019

  • Per EUMETSAT Service Alert 5119: "Since 21 August 2019 a problem with the geolocation software has resulted in missing data in part of the IASI products from Metop-A. The problem causes missing geolocation and cloud information in the IASI L1 products, and empty contents in the IASI L2 products. This is affecting the global products. Impact on the regional EARS-IASI products is still being investigated. EUMETSAT is looking into the problem and hopes to provide a fix soon."
  • Initial impact was on 21 August; beginning about 29 Aug there was a slow decline in the number of obs at 00 and 12 UTC, and a much larger decrease at 06 and 18 UTC. After 13 Sep data counts were very low or zero at 06 and 18UTC and by 18 Sep 00UTC the data was completely missing.
  • Emails from Stephanie Guedj at EUMETSAT forwarded to the ITWG list indicated that the anomaly is related to the drift/inclination of the Metop-A spacecraft, and that a fix was being worked on.
  • The data counts began to recover on 23 September, reaching normal levels on 24 September.

IASI MetOp-A calibration change 30 Sep 2019 09:00UTC

  • EUMETSAT announcement 5056 - The non-linearity correction tables for Metop-A IASI are planned to be updated. The impact on the Metop-A IASI level 1c radiances will be around 0.1-0.2K depending on scene temperature.
  • RadMon plots show some impact of the calibration change. The bias correction adjusted for the change.

ATMS SNPP calibration change 15 Oct 2019

  • An announcement of a calibration adjustment that was broadcast over the TOVS NWP mailing list. The calibration change was between 12UTC and 18 UTC on 15 October 2019.
  • RadMon plots show some impact of the calibration change. The bias correction adjusted for the change.

IASI MetOp-A outage 12-18 November 2019

  • EUMETSAT announcement 5266 - IASI special patch and dump activity aiming to reduce outage times in case of instrument switch off will cause a prolonged data outage. Start time 2019/11/12 07:10 UTC, end time 2019/11/18 13:00 UTC.

MetOp-A MHS ch 2 deterioration, summer/fall 2019

  • Noise levels on MetOp-A MHS channel 2 began to increase early in 2019, exceeding the instrument specification level in April 2019.
  • The problem was not noticed until later in the year, until after the accepted observation count dropped dramatically through October and November 2019. The MHS instrument was turned off in the 5_22 FP system at 2019/12/13 00z and from 2019/11/02 in MERRA2.
  • The system experiment x0039 was being continued through September 2019 when the problem was discovered, and it was decided to turn off MetOp-A MHS from 2019/09/15 00z. There was an error made when adding this configuration to the DAS tag however, so the initial run of the x0041 Winter 2019 experiment had MetOp-A MHS still being assimilated in late 2009 and had to be rerun. At that time a decision was made to move the turn-off date in the DAS tag to April 15 2019 00z.

Meteosat-10 SEVIRI Decontamination 13-20 January 2020

  • From January 13- 20, 2020, EUMETSAT plans to perform a decontamination of the Meteosat-11 SEVIRI instrument. Meteosat-11 data will be interrupted during this time period and Meteosat-9 back-up data, rectified to 0 degrees, will be disseminated to support the mission. EUMETSAT announcement NESDIS message

COSMIC-2 GPSRO

  • COSMIC-2 E1-E6 GPSRO data begins in our data stream starting March 18 2020 18GMT.

SNPP CrIS NSR data ends

  • On 22 April 2020 the feed of NSR data from CrIS SNPP was discontinued. The Full Spectral resolution (FSR) data continues. We had turned off the SNPP CrIS FSR data in the operational system after the switch to side-2 electronics (see above) so there was no impact on operations. We are looking to use the SNPP FSR CrIS data in the GEOSadas when work on the channel selection and correlated observation errors is completed.

Change in N20 CrIS-FSR - reduced acceptance rates in some channels

  • Monitoring personnel noticed a drop in the number of accepted data for some channels in early June. The change occurred on June 17 2020. The satellite messages and instrument noise levels were checked but there was no indication of what had caused the change. The accepted rate for some corresponding channels increased for the NCEP assimilation (per their monitoring plots). We are keeping an eye on this instrument.

AQUA data outage from August 16, 2020

  • On August 16, 2020 at 09:26:40 UTC, the data formatter for the solid state recorder on the Aqua satellite began exhibiting anomalous behavior during playback operations. All X-Band science data playback has been corrupted since the anomaly began. Spacecraft housekeeping data continues to be recorded and successfully transmitted to the ground. The other spacecraft bus subsystems and instruments are functioning nominally. Direct Broadcast (DB) data continues to transmit nominally. An update will be provided when the situation is resolved.
  • AIRS Aqua data returned starting with the 2 September 1800UTC synoptic time.

GPM satellite anomaly impacting core observatory data 19-26 August 2020

  • Effective about 11 UTC 19 August 2020, the GPM Mission Operations Center (MOC) stopped receiving data from the satellite. While the satellite and the instruments are healthy, the Flight Operations Team (FOT) is working to safely reestablish nominal operations. Return to data collection mode may take days to a week, which will result in a permanent data gap in the GPM Radar and Radiometer products. IMERG Near Real-Time will continue to be produced but obviously no GMI data will be included in either the Early or Late product.
  • On August 26, the GPM Radar and Radiometer (DPR and GMI) were commanded back into science data collection mode. The distribution of new GMI data is resumed, and files contain valid data starting with August 26, approximately 13:25 UTC.

MetOp-C IASI all FOV data starts Feb 23 2021, 14z

  • 22 Feb 2021 NCEP will implement obsproc_satingest v3.10.3 which will include processing of all FOV MetOpC IASI data (per RFC 7767).
  • Previous to this update, MetOpC IASI data from clear FOVs had been quietly added (per RFC 6864) beginning 2020/05/19 12z. This data was not assimilated.
  • We also obtained additional all-FOV data for MetOp-C IASI going back to early January 2021

CrIS-FSR SNPP Side 2 LW anomaly May 21, 2021 1552Z

  • 24 May 2021 A problem developed with the LW band on CrIS-FSR SNPP on Friday May 21. (Date/Time of Initial Impact: May 21, 2021 1552Z) The instrument is currently using the "Side 2 electronics" - since June 2019. Discussions are currently ongoing regarding whether to continue using Side-2 without the long-wave channels, or to switch back to Side 1 with missing mid-wave channels. We are not receiving CrIS-FSR data from the satellite at this time.
  • The CrIS-FSR SNPP SW and MW data (Side-2, no LW) returned to the data stream as of 6/2/2021 12z. It is not being assimilated.
  • CrIS-FSR SNPP making switch from Side-2 electronics to Side-1 starting 6/12/2021 1107z to 6/14/2021 1749z. After the sensor side switch is completed, Calibration/Validation efforts will be initiated by the NESDIS/STAR CrIS SDR Algorithm Calibration/Validation Science Team to ensure the SNPP CrIS calibrated data is at the highest quality and meets the JPSS maturity levels. The SNPP CrIS data will not be available until cleared by the calibration/validation science team.
  • CrIS-FSR SNPP data (SW and LW, no MW) resumes July 22, 2021 at 1400 UTC. Data is being monitored.

MetOp-C IASI anomaly 27-29 July 2021

  • 30 July 2021 After the scheduled maintenance on 27 July, the MetOp-C observations between 648 and 755 wavenumbers showed a shift in the mean bias of themeasurement for the first 24 hours by ~0.3 K then relaxation to near-normal biases. It was discovered that it was discovered that the operational settings of the MAS subsystem (offsets and gains) was not uploaded after the maintenance. Adjustment to the operational settings used before the power cycle was performed on Thursday the 29th and IASI-C was back in normal operations at around 2021-07-29 11:11 UTC.

NPP outage 3-4 August 2021

  • On August 3 2021 12:46:45Z NPP entered a state where it is no longer mission pointing after engineering executed a planned re-enabling of the star trackers as part of the Star Catalog loads. Engineering started recovery efforts and all instruments were put in a safe mode.
  • Engineering was able to successfully return the SNPP spacecraft back to the nominal Mission pointing status at 22:28 UTC August 3. The instrument recovery efforts commenced at 14:07 UTC Aug 4, 2021. As of 14:17 UTC, ATMS, CERES, and OMPS instruments were recovered. As of 1600 UTC the VIIRS instrument was recovered. As of 19:13 UTC the CrIS instrument was recovered.
  • Before the distribution of SNPP science data can resume, Cal/Val teams will need to check and verify that all the instruments are meeting expected requirements. More notices will follow to inform users as each instrument returns to a nominal state.
  • ATMS data returned on 6 August 18 UTC but the initial data set was quite small and caused the FPIT run to crash. That data was excluded from FPIT and will be excluded from MERRA2.
  • CrIS-FSR data returned on 10 August 00UTC. The data will be monitored to determine when it can be turned on again in the DAS.

GRAS data processing updated to version 5 on 14 September 2021.

  • 5 Sep 2021 Operational Radio Occultation products derived from the measurements of the Metop GRAS instruments will be updated on 14 September. In the new version of the operational processor (v5), the retrieval algorithms for bending angle data have been updated, solving a number of known issues in the GRAS level 1 data quality. In particular:
    • No non-physical oscillations (in the mesosphere) and spikes (in the troposphere), previously present in a small number of bending angle profiles.
    • Existing asymmetry between tropical tropospheric bending angle biases for rising and setting occultations has been largely reduced.
    • Statistical properties of lower tropospheric bending angle data are now more consistent with those of other publicly available radio occultation data.
    • Standard deviations statistics improved, especially at high altitudes and in the mid- and lower troposphere.
  • see https://www.eumetsat.int/new-version-gras-radio-occultation-processing

MetOp-A IASI outage - Technology Test, end of MetOp-A IASI assimilation

  • 14 Sep 2021 EUMETSAT announced a technology test for MetOp-A IASI. IASI has been set to the redundant side to do anomaly investigation. 6 days of outage are expected during this test. The outage started 08 September 12z. Expected end time 2021-09-15 10:00:00. The notice states "Please note that data generated after the outage might be degraded."
  • An additional technology test is scheduled for 2021-09-16 00:00:00 - 2021-10-15 00:00:00. IASI will scan with oversampling. The data quality is expected nominal for the entire duration of the test. However, the scan pattern will be changed (i.e. 30 scan positions will overlap) as the swath will be reduced from 2200 km to ~200 km. 4 hours of outage are foreseen on the first day of the test.
  • 20 Sep 2021 The MetOp-A IASI outage for the first test began 2021-09-08 12z. The MetOp-A IASI data returned in the 2021-09-15 06z dataset with a partial swath, according to coverage plots. At 2021-09-16 12z the number of accepted obs dropped to near zero (presumably with the start of the second technology test). The ana.log files had messages about "READ_IASI WARNING uncertainty in lza". It was decided to turn off MetOp-A IASI data starting with the 12z assimilation on this date (9/20/2021) - this will be the end of our usage of MetOp-A IASI since the data is not expected to be available after the end of the technology test.
  • 19 Oct 2021 The MetOp-A IASI instrument was switched off on October 15. Note that all other Metop-A instruments and products will be shut off by November 15, and the satellite will be de-orbited by December 1. In future tags we will be marking the end date for MetOp-A IASI in the 'active_channels.tbl' and the 'available_channels.tbl' as 9/08/21 06z prior to the first outage. By turning off the data in the 'available_channels.tbl' we will avoid the "READ_IASI WARNING uncertainty in lza" error messages that would appear even when the data is read in as passive.
  • 3 Dec 2021 The MetOp-A instruments were supposed to have been shut off by November 15 - EUMETSAT discontinued data dissemination on that date. However, some data (e.g AMSU-A, MHS, AVHRR) continued to be distributed by NOAA and at least for AMSU-A there were reports of degradation. The final date with MetOp-A data was 27 Nov 2021, 12Z.

Aqua AIRS data problem 23 Sept 2021

  • From the AIRS science team at JPL (per email from Dominic Flournoy 610.2):

"we had a deep space maneuver on the 23rd and the spectral cal didn’t come back quite where it started. L1B is still 100% valid".

They are considering asking us to hide ~1 day of data from when it was unstable right after the maneuver. For your reference, here is the detailed timeline (UT) from the 23rd: 

  266/09:12:00  AIRS put into READY mode prior to Deep Space Cal
  266/09:12:28  Slew out begins
  266/09:52:25  Slew out complete
  266/09:53:30  Close-out slew begins
  266/09:55:13  Return slew complete
  266/09:56:00  AIRS back in OPERATE mode
  • This issue led to the bias coefficients (mean, cross-track bias) adjusting for several channels in FP. The adjustment was somewhat less in the MERRA2 run (mainly mean term) since the angle coefficients are slower to respond in the old variational bias correction. Since the data was reported as bad, we are opting to rewind MERRA2 and take out two days of data to get past this point in the run before using AIRS data again.

Aqua AIRS ch 305 becoming noisy

  • 13 Jan 2022 Channel 305 on AIRS Aqua is becoming noisy starting at 11 Jan 2022 12z. The channel is being turned off in our assimilation.

MetOp-B IASI outage 8-14 March 2022

  • 11 Mar 2022 200K IASI decontamination, scheduled from 2022-03-08 08:15:00.0 to 2022-03-14 16:00:00.0. IASI MetOp-B data absent from 8 March 2022 12z onward.
  • 17 Mar 2022 IASI MetOp-B data resumed in the 14 March 2022 18z file.

GPM GMI outage 23-24 March 2022

  • 23 Mar 2022 GPM transitioned to Sunpoint mode (SPM) on 03/23/2022 (DOY 082) after the spacecraft detected errors during the DMU #81 maneuver and aborted at approximately 13:31:29 UTC. Instruments (DPR & GMI) are in Standby mode and safe. FOT is currently investigating the causes.
  • 24 Mar 2022 The GPM Flight Operations Team working with JAXA and Ball have commanded both the radar and the radiometer to observation mode. Everything came up just as expected. The radar data stream began at approximately 10:54 UTC 24 March 2022 and the radiometer at approximately 14:54 UTC 24 March 2022. GPM PPS and JAXA MOS has been receiving data and processing to GPROF level 2 for the radiometer and level 2 for the radar products.

Aqua satellite anomaly impacting AIRS operational status beginning March 31, 2022 at 17:59:08 UTC

  • On March 31, 2022 at 17:59:08 UTC the Aqua On-Board Fault Management (OBFM) detected a fault in the primary Power Controller (PC-A) and autonomously transitioned to the redundant Power Controller (PC-B). As part of the OBFM actions the spacecraft was configured to Earth Point Safe Mode. All Aqua instruments are currently in their respective safe modes, with no science data being produced. Updates to follow as they are made available.
  • The AIRS data returned as of 2022/04/07 18z. The data was turned on again in FP at 2022/04/19 12z.

SNPP satellite outage 28 July 2022

  • 28 Jul 2022 The SNPP spacecraft entered a non-nominal state at ~16:24:49 UTC on July 26, 2022, after which all SMD and telemetry data was inaccessible. The spacecraft and all instruments are currently in a safe mode state. Efforts are underway to investigate the S-NPP anomaly and prepare a plan to return the S-NPP spacecraft back to nominal status.

NESDIS message

  • 25 Aug 2022 The ATMS and CrIS SDR products were approved for operational use as of Tuesday, August 16, 2022. The ATMS data resumed in our data stream as of 00UTC 17 August and has been passive in FP pending review. The data was not turned off in FPIT. CrIS-FSR SNPP returned to our data stream 00UTC 24 August and is also in passive mode.
  • 26 Aug 2022 The OMPS nadir mapper data for SNPP also returned 00UTC 24 August.
  • 30 Aug 2022 The ATMS instrument on S-NPP went into safe mode sometime prior to the August 28, 2022 09 UTC ground station contact session, and no science data is being produced. Instrument engineers are investigating. Updates will be posted as they are made available.
  • 1 Sep 2022 The CrIS-FSR SNPP BUFR data was missing from 8/28/2022 12UTC to 8/31/2022 12UTC due to processing issues associated with the ATMS SNPP outage. ATMS SNPP is out of safe mode as of 18:21 UTC and the data are currently being assessed to see if they meet operational requirements.

Terra Constellation Exit Maneuver (CEM) on October 12 and 19

  • Due to the Constellation Exit Maneuver on October 12 and 19 all science products from observations onboard Terra satellite will be unavailable starting October 10 till October 19. Products after the maneuver may be unreliable and will be checked by the cal/val team.
  • This outage impacted MODIS AMVs and aerosols. MODIS Terra AMVs were turned off in f5294_fp as of 2022/10/10. The Terra winds resumed in the SATWND input files on 10/28 12z.

GOES-18 replaces GOES-17 as operational GOES West

  • GOES-18 became the operational GOES-West satellite as of 4 January 2023, 18UTC.

SNPP CrIS scan mirror baffle temperature anomaly

  • On May 18, 2023, around 14:04:47 UTC SNPP CrIS experienced a sudden drop in the scan baffle temperature reading. The baffle temperature telemetry value is used in the CrIS radiometric calibration.
  • The assessment performed by the CrIS Cal/Val Science Team has shown that the anomaly impact is in the form of a cold radiometric bias with an estimated magnitude of about 0.1 K over the LWIR band and 0.2 K over the SWIR band. The performance of the SNPP CrIS SDR data has been evaluated and complies with the JPSS Level-1 requirements. The impact of the anomaly is well-understood and solutions are being developed and tested. See NESDIS satellite message
  • 1 Jun 2023 The radiance monitoring showed that the radiance bias of the CrIS SNPP data was impacted. The change in bias appears to have mostly stabilized. The bias correction coefficients quickly adjusted to the change in bias.

AMSU-A MetOp-B ch6 increased noise level

  • 2 Jun 2023 Noise levels for AMSU-A MetOp-B channel 6 have been increasing with a substantial jump in the noise levels since November 2022. This has led to scan lines marked as missing data when the noise level is excessive, and the count of radiance data has decreased by half. The lower channels (including ch 6) have not been used since the failure of ch 15 some time ago so this should not affect the current DAS although earlier systems (MERRA2, FPIT) exclude all channels for spots where key channels (such as ch6) are bad.


MHS MetOp-B anomaly

  • An instrument anomaly was reported for MHS MetOp-B beginning 2023-06-02 07:45. The MetOp-B MHS data is missing in our input files from 20230602 12z through 20230606 12z.
  • From [4] on June 7 2023, after 09:58 UTC the noise on MHS channel 3 and 4 increased above NEDT specification.
  • From [5] due to a Metop-B MHS Instrument anomaly investigation and testing there will be a data outage from 13th June 07:11 UTC until further notice.
  • 12 June 2023 While the bias correction in the forward processing appeared to adjust to the change in the instrument, due to the increased noise and the later outage for testing the MetOp-B MHS is being turned off in MERRA2 from 6/3/2023 until the issue is resolved.
  • 23 June 2023 The noise level dropped to normal range for ch3 and ch4 after the return of Metop-B MHS data although there were no announcements about the state of the instrument. The instrument will be turned back on in DAS runs as of 00UTC 29 June, after the McMurdo Maintenance period on 28 Jun.

CrIS-FSR SNPP Long Wave Signal Processor Failure

  • JPSS S-NPP CrIS (Cross Track Infrared Sounder) experienced a Long Wave Signal Processor Failure on August 13, 2023 at approximately 21:32 UTC. Engineering is investigating the cause of the CrIS LWIR failure. The overall health and safety of S-NPP Spacecraft Bus and the remaining instruments on board are nominal.
  • Update from the CrIS L1B science team (July 20, 2023): This has been diagnosed as an issue with the temperature sensor or readout circuitry and the actual Scene Select Module (SSM) baffle temperature remains nominal. At the time of the anomaly the measured SSM scan baffle temperature data dropped to a fixed and unrepresentative value of 250.1K, where it has remained since that time. The measured value of the SSM scan baffle temperature is used in the Internal Calibration Target (ICT) radiometric model and the polarization correction. The faulty temperature reading results in a cold radiometric bias in the SNPP CrIS calibrated radiances with an estimated magnitude of approximately 0.1 K in the LWIR band and 0.2 K in the SWIR band. Quality flags indicate invalid data for both bands. A solution has been developed and tested to address the issue and significantly reduce cold radiometric bias in the calibrated radiances. This issue will be addressed an upcoming patch for the Version 3 SNPPCrISL1B and SNPPCrISL1BNSR products.
  • Note that SNPP CrIS is now operating in MW+SW mode. There will no longer be LW data available from SNPP CrIS, since both LW signal processors have failed.

As of Friday September 8, 2023, all CrIS SDR and BUFR products are approved for operational use and NDE/PDA subscriptions for those products were enabled at 15:30 UTC, September 8, 2023. Direct Broadcast (DB) users can use the equivalent CSPP LEO products for operations. As a reminder, the Long Wave band data will no longer be available from the S-NPP CrIS instrument. This completes the S-NPP CrIS side-1 to side-2 swap anomaly recovery.

Transitioning off the existing NOAA POES Ground System to a Commercial Ground System service

  • On September 11, 2023 at 16:20 UTC during rev 94379 the NOAA-18 satellite will be fully transitioned to Parsons (Command and Control) C2 Commercial Ground Services. This first transition of a POES satellite is an ongoing effort to extend the utility of the legacy POES satellite constellation by extending life through use of a commercial system called Ground Station as a Service (GSaaS) approach. The data and products from NOAA-18 will not be distributed while data quality evaluations are ongoing. Direct readout data from NOAA-18 will continue to be made available to those users of that service.
  • The other satellites (NOAA-15, NOAA-19) have also experienced briefer data losses in late September and early October due to supporting POES EL (Extended Life) ground system testing.

MetOp-C AMSU-A increased noise level ch 4

  • Noise levels for MetOp-C AMSU-A channel have been increasing with an accelerated rate since mid-2022. In early October 2023 the number of rejected data for the channel increased significantly, with an increased number of missing values starting around 7 Oct 2023. The rejected data increased until nearly all of the radiances for channel 4 in the operational stream were missing by 20 Oct. The missing radiances for channel 4 led to rejection of other channels (ch 5, 6) on the instrument.
  • Due to the large number of rejections, Channels 4,5, and 6 were turned off in FP and in GEOSIT as of 20231020 12UTC. Shortly after that date (24 Oct) the radiance processing was modified and channel 4 data resumed (albeit noisy). Ch 4,5,6 remain turned off for MetOp-C AMSUA.

ESPC Legacy Products Retirement of MODIS Winds

  • 30 Jan 2024 MODIS wind processing ended January 29 2024. NESDIS satellite message The last date with MODIS winds was 2024/01/29 12z.

ESPC Legacy Products Retirement of AVHRR Cloud Drift Polar Winds (NOAA 15/18/19)

  • Processing of AVHRR Cloud Drift Polar Winds ended on April 3, 2024. NESDIS satellite message The last date with the AVHRR winds from NOAA satellites was 2024/04/03 12z.
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