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Past & Previous Alerts

warn_icon.gif IMPORTANT MESSAGE Aug 24, 2016    Rollback and Replacement of GPM Data for Aug. 20, 2016 (Orbit# 14083)   

Precipitation Processing System (PPS) had to rollback and replace GPM data for August 21, 2016 (Orbit #14083) due to a Geobuilder processing error. If you have previously obtained any of the data listed below, please discard these and replace this data with the retro-processed data as listed. PPS had to rollback and retro-process the following files. Please note a change in End Time (old: E212040 -> new: E212041). 

 
1A.GPM.GMI.COUNT2016.20160820-S194807-E212040.014083.V04A.HDF5 
2A.GPM.Ka.V6-20160118.20160820-S194807-E212040.014083.V04A.HDF5 
2A.GPM.Ku.V6-20160118.20160820-S194807-E212040.014083.V04A.HDF5 
2A.GPM.DPR.V6-20160118.20160820-S194807-E212040.014083.V04A.HDF5 
2A.GPM.DPR.GPM-SLH.20160820-S194807-E212040.014083.V04A.HDF5 
3A-ORBIT.GPM.DPR.GPM-SLH.20160820-S194807-E212040.014083.V04A.HDF5 
 
They have since been replaced with: 
1A.GPM.GMI.COUNT2016.20160820-S194807-E212041.014083.V04A.HDF5 
2A.GPM.Ka.V6-20160118.20160820-S194807-E212041.014083.V04A.HDF5 
2A.GPM.Ku.V6-20160118.20160820-S194807-E212041.014083.V04A.HDF5 
2A.GPM.DPR.V6-20160118.20160820-S194807-E212041.014083.V04A.HDF5 
2A.GPM.DPR.GPM-SLH.20160820-S194807-E212041.014083.V04A.HDF5 
3A-ORBIT.GPM.DPR.GPM-SLH.20160820-S194807-E212041.014083.V04A.HDF5 
 
The old granules will be purged from the GPM archive at GES DISC.

warn_icon.gif IMPORTANT MESSAGE May 12, 2016    Access and distribution of Globally-merged, full-resolution (~4 km) IR data from GES DISC   

   Access and distribution of Globally-merged, full-resolution (~4 km) IR data from GES DISC will be terminated after 30 June 2016.

   The Globally-merged, full-resolution (~4 km) IR data from geostationary satellites is available from NOAA at ftp://ftp.cpc.ncep.noaa.gov/precip/global_full_res_IR

warn_icon.gif IMPORTANT MESSAGE May 09, 2016    TRMM archive downtime, May 11   

TRMM data archive at GES DISC will undergo upgrades that will require downtime. It is anticipated the downtime will start at 8 am on May 11, and will be finalized by 5 pm on the same day, EST. The impact will extend to data links prefixed with "http://disc2" or "ftp://disc2". This alert will be updated in case the downtime needs to be extended, or otherwise modified. 

warn_icon.gif IMPORTANT MESSAGE Nov 23, 2015    Phasing out TRMM Version 6   

GES DISC is in the process of phasing out TRMM Version 6 data that covered the period December 1997 - June 2011. These data were superseded and obsoleted by the much improved Version 7. We also do remind that data from the TMPA Version 7 are still produced, even though the TRMM satellite was decommissioned in April, and deorbited in June, 2015. The Version 6 data will first be reduced in visibility in web search engines  and documentation, and then physically removed from the on-line archives by the end of February, 2016.

warn_icon.gif IMPORTANT MESSAGE Jul 24, 2015    Why do my Data Holdings look different?    

Accessing your data through the GES DISC web site may seem a little unfamiliar to you to these days, but we can assure you, your data is all still available. The location of the data in the online archive has not changed.

The GES DISC has implemented a new interactive interface to make finding data easier than ever. We've added features like searching by keywords, filtering by criteria such as measurements, processing level and spatial resolution, and sortable data columns so now you can fine tune your search results. To get you started we put together a Help document to introduce you to the new interface. If you have any questions about the new design please contact us using the Feedback link in the upper right-hand corner or contact the GES DISC Help Desk by sending email to gsfc-help-disc@lists.nasa.gov.

warn_icon.gif IMPORTANT MESSAGE Apr 16, 2015    Missing data issue in 3B42RT   

IR fill-ins ceased when CPC Global 4 km Merged IR data dropped out, starting 14 April 17:00 UTC, apparently due to processing issues at NOAA.  As a result, 3B41RT has no data and 3B42RT only has data in regions where microwave data are available.

warn_icon.gif IMPORTANT MESSAGE Apr 02, 2015    Information about the end of TRMM mission   

Dear TRMM users,

The TRMM mission is unfortunately coming to an end. It was launched on November 27, 1997, and has provided the research and operational communities with unique precipitation information from space for more than 17 years.  The mission will end on approximately April 8, 2015, in preparation for re-entry during the summer. The overarching TRMM science goal was to advance our knowledge of the global energy and water cycles by observing time and space distributions of tropical rainfall, convective systems and storms, and their associated hydrometeor structure and latent heating distributions. TRMM data provided the most accurate estimate ever of tropical rainfall and lightning and its variations (from sub-daily to monthly, seasonal, annual, and interannual time scales).

It led to new insights into the structure and evolution of convective systems, including extreme events like tropical cyclones and flood producing storms. TRMM provided a benchmark climatology used to validate and improve global climate and weather forecast models and shed light on ways in which humans impact precipitation. While TRMM is coming to an end, we are fortunate to have the very successful Global Precipitation Measurement (GPM) mission beginning its second year of operations and providing valuable data with more advanced sensors and up to higher latitudes. We thank all of you who have helped to make TRMM a great success.

 

Scott Braun, NASA TRMM Project Scientist

Ramesh Kakar, NASA TRMM Program Scientist

Riko Oki     JAXA TRMM Program Scientist

 

warn_icon.gif IMPORTANT MESSAGE Mar 31, 2015    TRMM PR instrument to be turned off on 1 April   

From PPS: As part of the end of mission activities the PR instrument will be turned off on 1 April.  We will inform you about other end of mission dates as they are firmed up.

warn_icon.gif IMPORTANT MESSAGE Mar 31, 2015    IMPORTANT: Rollback and Reprocessing of TRMM TMI and Partner Data (March 04, 2015 - Present)   

From PPS: PPS is Rolling back and retro reprocessing TRMM  TMI and affected partner data starting with March 04, 2015 products.  If you have obtained any of the listed data previously (see below), please discard this and use the latest available retro proccessed data.

PPS is retro processing and replacing the following data products:
From 2015-03-04  through 2015-03-29

1B11
1B11_BR
2A12
2A12_BR
2B31
2B31_BR

1CTRMMTMI
1CTRMMTMI_BR
2AGPROFTRMMTMI
3GPROFTRMMTMI_DAY
3GPROFTRMMTMI_DAY_BR

Here are more details from our science team on the cause of this data reprocessing:
 




The TMI data quality has recently been flagged as bad due to the low TRMM operating altitude and limit checks initially established before launch.


The measured data and calculated geolocation is actually valid.  To remove the inappropriate flagging, the data since March 4th, 2015, will be reprocessed for all TMI-derived products, allowing appropriate limit checks to include data below 340 kilometers mean altitude.

Details of the flagging anomaly are described for those interested.  One bit of the geolocation quality flag (geoQuality in the scanStatus group of 1B11 and 1Base products) is designed to indicate "bad geolocation" by checking the ranges of various scalar quantities.  One of those quantities is the orbit radius magnitude.  The upper limit on this was increased after the orbit boost in 2001.  The lower limit was left at the original prelaunch values, corresponding to about 10 kilometers below the initial mean operating altitude of 350 kilometers.  It was not noticed until last week that this limit had been tripped for part of each orbit starting on March 4th, setting the geoQuality flag which flows to the dataQuality flag.  To correct this problem that limit has been lowered to allow unflagged data quality in PPS products for the last few weeks of the extended science mission.  TMI is now currently expected to be turned off on April 9th, 2015, at which time the TRMM orbit radius (mean Semi-major axis) will be about 333 kilometers.  Note that the TRMM orbit remains close to circular, but the altitude variation around the orbit is no longer in the original "frozen orbit" fixed-eccentricity configuration with perigee held near the northernmost latitudes.

 




We apologize for any inconvenience this may have caused and appreciate your patience and understanding.  Please inform us if you have any questions or concerns.
 

warn_icon.gif IMPORTANT MESSAGE Mar 04, 2015    TMPA Restarted with October 2014   

On October 07, 2014, routine production ended for the TRMM PR precipitation estimates.  Since PR is no longer available, the TMI/PR combined instrument (TCI) estimates are also no longer available.  As products 3B42/3B43 use the TCI estimates as the satellite calibrator, September 2014 is the last month these products were produced in this way.  In an effort to continue 3B42/3B43 available and usable, the real time TMPA (TMPA-RT) climatological calibrations/adjustments have been adapted for use in the 3B42/3B43.  October 2014 is the first month of the climatologically calibrated/adjusted 3B42/3B43.  Users should note there will be a discontinuity in the record as a result.  Each individual user must determine the most appropriate use of the climatologically calibrated/adjusted 3B42/3B43 products.

The two-month latency for 3B42/3B43 remains the same with this new calibration.  The delayed release for October 2014 reflects both development work and a problem with the input IR data.  The previously released "provisional" data set is now considered obsolete and should not be used (although in many areas it is identical to this official release).  As well, a (different) problem with the input IR for November 2014 is not yet resolved, so that data set is still in provisional status.  We expect to have updated November 2014 IR data in the very near future, and thereafter run on the usual schedule.

For more details, see this document.

 

warn_icon.gif IMPORTANT MESSAGE Mar 02, 2015    TRMM DSC (Deep Space Calibration) Feb. 26-27, 2014 and TMI Data   

From PPS: TRMM underwent a DSC (Deep Space Calibration) for the TMI instrument on Thursday February 26, 2015 and Friday February 27, 2015.  This maneuver impacted the following orbits/granules:

 

02/26/2015- orbits-  98452-98457:   Some partial or irregular data due

to Deep Space Calibration (DSC) maneuvers.

02/27/2015 -orbits-  98468-98473:   Some partial or irregular data due

to Deep Space Calibration (DSC) maneuvers.

 

For the exact times, please see the information below:

-------------------------------------------------------------------------

Deep Space Calibration#1:  Feb 26, 2015 13:54:45 to 15:26:15 UTC

Orbit #     Orbit Start             Orbit Stop

-------     -----------------       ------------------

98452       2015-02-26 13:06:22     2015-02-26 14:37:40

98453       2015-02-26 14:37:41     2015-02-26 16:08:59

 

Deep Space Calibration#2:  Feb 26, 2015 16:57:44 to 18:29:13 UTC

Orbit #     Orbit Start             Orbit Stop

-------     -----------------       ------------------

98454       2015-02-26 16:09:00     2015-02-26 17:40:19

98455       2015-02-26 17:40:20     2015-02-26 19:11:38

 

Deep Space Calibration#3:  Feb 26, 2015 20:00:42 to 21:32:12 UTC

Orbit #     Orbit Start             Orbit Stop

-------     -----------------       ------------------

98456       2015-02-26 19:11:39     2015-02-26 20:42:57

98457       2015-02-26 20:42:58     2015-02-26 22:14:16

 

Deep Space Calibration#4:  Feb 27, 2015 14:18:28-15:49:57 UTC

Orbit #     Orbit Start             Orbit Stop

------     -----------------       ------------------

98468       2015-02-27 13:27:27     2015-02-27 14:58:45

98469       2015-02-27 14:58:46     2015-02-27 16:30:04

 

Deep Space Calibration#5:  February 27, 2015 17:21:25-18:52:53 UTC

Orbit #     Orbit Start             Orbit Stop

-------     -----------------       ------------------

98470       2015-02-27 16:30:05     2015-02-27 18:01:23

98471       2015-02-27 18:01:24     2015-02-27 19:32:42

 

Deep Space Calibration#6:  February 27, 2015 20:24:22-21:55:50 UTC

Orbit #     Orbit Start             Orbit Stop

-------     -----------------       ------------------

98472       2015-02-27 19:32:43     2015-02-27 21:04:01

98473       2015-02-27 21:04:02     2015-02-27 22:35:19

-----------------------------------------------------------------------------------

 

Please be aware that these data are being distributed as regular products and NOT empty granules replacements. These data products also contain useful sections of DSC data as well as earth view data.

 

Contact the helpdesk if you have any questions or concerns regarding this event or the data mentioned.

 

warn_icon.gif IMPORTANT MESSAGE Dec 05, 2014    PPS Updating GPM Radiometer Products due to Sun Angle Corrections   

 This is a minor update and only the letter was incremented.

DataType Current New
1AGMI V03A V03B
1BGMI V03B V03C
1CF16SSMIS V02A V02B
1CF17SSMIS V02A V02B
1CF18SSMIS V02A V02B
1CGCOMW1AMSR2 V03A V03B
1CGPMGMI V03B V03C
1CGPMGMI_R V03B V03C
1CMETOPAMHS V02A V02B
1CMETOPBMHS V02A V02B
1CMT1SAPHIR V02A V02B
1CNOAA18MHS V02A V02B
1CNOAA19MHS V02A V02B
1CNPPATMS V02A V02B
1CTRMMTMI V02A V02B
2AGPROFF16SSMIS V03A V03B
2AGPROFF16SSMIS_CLIM V03A V03B
2AGPROFF17SSMIS V03A V03B
2AGPROFF17SSMIS_CLIM V03A V03B
2AGPROFF18SSMIS V03A V03B
2AGPROFF18SSMIS_CLIM V03A V03B
2AGPROFGCOMW1AMSR2 V03B V03C
2AGPROFGCOMW1AMSR2_CLIM V03B V03C
2AGPROFGPMGMI V03C V03D
2AGPROFGPMGMI_CLIM V03C V03D
2AGPROFMETOPAMHS V03B V03C
2AGPROFMETOPBMHS V03B V03C
2AGPROFNOAA18MHS V03B V03C
2AGPROFNOAA19MHS V03B V03C
2AGPROFTRMMTMI V03A V03B
2AGPROFTRMMTMI_CLIM V03A V03B
2BCMB V03C V03D
3CMB V03C V03D
3CMB_DAY V03C V03D
3GPROFF16SSMIS V03B V03C
3GPROFF16SSMIS_CLIM V03B V03C
3GPROFF16SSMIS_DAY V03B V03C
3GPROFF16SSMIS_DAY_CLIM V03B V03C
3GPROFF17SSMIS V03B V03C
3GPROFF17SSMIS_CLIM V03B V03C
3GPROFF17SSMIS_DAY V03B V03C
3GPROFF17SSMIS_DAY_CLIM V03B V03C
3GPROFF18SSMIS V03B V03C
3GPROFF18SSMIS_CLIM V03B V03C
3GPROFF18SSMIS_DAY V03B V03C
3GPROFF18SSMIS_DAY_CLIM V03B V03C
3GPROFGCOMW1AMSR2 V03B V03C
3GPROFGCOMW1AMSR2_CLIM V03B V03C
3GPROFGCOMW1AMSR2_DAY V03B V03C
3GPROFGCOMW1AMSR2_DAY_CLIM V03B V03C
3GPROFGPMGMI V03C V03D
3GPROFGPMGMI_CLIM V03C V03D
3GPROFGPMGMI_DAY V03C V03D
3GPROFGPMGMI_DAY_CLIM V03C V03D
3GPROFMETOPAMHS V03C V03D
3GPROFMETOPAMHS_DAY V03C V03D
3GPROFMETOPBMHS V03C V03D
3GPROFMETOPBMHS_DAY V03C V03D
3GPROFNOAA18MHS V03C V03D
3GPROFNOAA18MHS_DAY V03C V03D
3GPROFNOAA19MHS V03C V03D
3GPROFNOAA19MHS_DAY V03C V03D
3GPROFTRMMTMI V03B V03C
3GPROFTRMMTMI_CLIM V03B V03C
3GPROFTRMMTMI_DAY V03B V03C
3GPROFTRMMTMI_DAY_CLIM V03B V03C

 

 Below is a table detailing the date/time when the old Product Version was halted.

DataType Product Version Version End  
1AGMI V03A 12/4/2014 10:17  
1BGMI V03B 12/4/2014 8:44  
1CF16SSMIS V02A 12/2/2014 23:18  
1CF17SSMIS V02A 12/2/2014 23:48  
1CF18SSMIS V02A 12/2/2014 23:38  
1CGCOMW1AMSR2 V03A 12/2/2014 23:02  
1CGPMGMI V03B 12/4/2014 8:44  
1CGPMGMI_R V03B 12/4/2014 5:39  
1CMETOPAMHS V02A 12/2/2014 23:14  
1CMETOPBMHS V02A 12/2/2014 22:26  
1CMT1SAPHIR V02A 11/28/2014 1:49  
1CNOAA18MHS V02A 12/2/2014 23:53  
1CNOAA19MHS V02A 12/2/2014 23:45  
1CNPPATMS V02A 12/2/2014 23:28  
1CTRMMTMI V02A 11/30/2014 22:31  
2AGPROFF16SSMIS V03A 12/2/2014 23:18  
2AGPROFF16SSMIS_CLIM V03A 8/24/2014 23:04  
2AGPROFF17SSMIS V03A 12/2/2014 23:48  
2AGPROFF17SSMIS_CLIM V03A 8/24/2014 23:44  
2AGPROFF18SSMIS V03A 12/2/2014 23:38  
2AGPROFF18SSMIS_CLIM V03A 8/24/2014 23:54  
2AGPROFGCOMW1AMSR2 V03B 12/2/2014 23:02  
2AGPROFGCOMW1AMSR2_CLIM V03B 8/24/2014 23:28  
2AGPROFGPMGMI V03C 12/2/2014 22:49  
2AGPROFGPMGMI_CLIM V03C 8/24/2014 22:57  
2AGPROFMETOPAMHS V03B 12/2/2014 23:14  
2AGPROFMETOPBMHS V03B 12/2/2014 22:26 * orbit 11432, 2014-12-01 09:16:41 to 2014-12-01 10:58:01, is awaitig data will have version V03C
       
2AGPROFNOAA18MHS V03B 12/2/2014 23:53  
2AGPROFNOAA19MHS V03B 12/2/2014 23:45  
2AGPROFTRMMTMI V03A 11/30/2014 22:31  
2AGPROFTRMMTMI_CLIM V03A 8/24/2014 23:35  
2BCMB V03C 12/3/2014 17:19  
3CMB V03C 11/30/2014 23:59  
3CMB_DAY V03C 12/1/2014 23:59  
3GPROFF16SSMIS V03B 11/30/2014 23:59  
3GPROFF16SSMIS_CLIM V03B 7/31/2014 23:59  
3GPROFF16SSMIS_DAY V03B 12/1/2014 23:59  
3GPROFF16SSMIS_DAY_CLIM V03B 8/23/2014 23:59  
3GPROFF17SSMIS V03B 11/30/2014 23:59  
3GPROFF17SSMIS_CLIM V03B 7/31/2014 23:59  
3GPROFF17SSMIS_DAY V03B 12/1/2014 23:59  
3GPROFF17SSMIS_DAY_CLIM V03B 8/23/2014 23:59  
3GPROFF18SSMIS V03B 11/30/2014 23:59  
3GPROFF18SSMIS_CLIM V03B 7/31/2014 23:59  
3GPROFF18SSMIS_DAY V03B 12/1/2014 23:59  
3GPROFF18SSMIS_DAY_CLIM V03B 8/23/2014 23:59  
3GPROFGCOMW1AMSR2 V03B 11/30/2014 23:59  
3GPROFGCOMW1AMSR2_CLIM V03B 7/31/2014 23:59  
3GPROFGCOMW1AMSR2_DAY V03B 12/1/2014 23:59  
3GPROFGCOMW1AMSR2_DAY_CLIM V03B 8/23/2014 23:59  
3GPROFGPMGMI V03C 11/30/2014 23:59  
3GPROFGPMGMI_CLIM V03C 7/31/2014 23:59  
3GPROFGPMGMI_DAY V03C 12/1/2014 23:59  
3GPROFGPMGMI_DAY_CLIM V03C 8/23/2014 23:59  
3GPROFMETOPAMHS V03C 11/30/2014 23:59  
3GPROFMETOPAMHS_DAY V03C 12/1/2014 23:59  
3GPROFMETOPBMHS V03C 11/30/2014 23:59  
3GPROFMETOPBMHS_DAY V03C 11/30/2014 23:59  
3GPROFNOAA18MHS V03C 11/30/2014 23:59  
3GPROFNOAA18MHS_DAY V03C 12/1/2014 23:59  
3GPROFNOAA19MHS V03C 11/30/2014 23:59  
3GPROFNOAA19MHS_DAY V03C 12/1/2014 23:59  
3GPROFTRMMTMI V03B 10/31/2014 23:59  
3GPROFTRMMTMI_CLIM V03B 7/31/2014 23:59  
3GPROFTRMMTMI_DAY V03B 11/29/2014 23:59  
3GPROFTRMMTMI_DAY_CLIM V03B 8/23/2014 23:59  

 

warn_icon.gif IMPORTANT MESSAGE Oct 24, 2014    Data input issues for 3B4XRT   

The interrupted inputs to the 3B4xRT data sets have resumed as of 16:00 UTC on 23 October 2014. All products are once again being produced with full input. Those 3B4xRT data affected by the interrupted inputs may be reprocessed. If so, we will provide an update. NB: For 3B42RT, the last pre-interruption file time is 21:00 UTC on 20 October 2014, and the first post-interruption file time is 18:00 UTC on 23 October 2014.

warn_icon.gif IMPORTANT MESSAGE Oct 09, 2014    IMPORTANT: TRMM PR Data Unavailable After Oct. 07, 2014 Due to Satellite Descent   

 
Dear Science User,
 
As the descent of TRMM is underway users of TRMM PR data should be aware that the last production orbit of public PR data will be orbit #96230 on data date Oct. 7, 2014. After this time the TRMM PR data is restricted.  TRMM TMI data will continue to be produced and publicly available during the descent of the spacecraft until it reaches its decommissioning altitude of 335km.

warn_icon.gif IMPORTANT MESSAGE Oct 08, 2014    Effective October 8th, 2014 all PR data will not be available.   

From PPS: Effective 20:00 EDT, Oct 7 (00:00 UTC Oct 8), the TRMM PR data will no longer be available in near realtime (NRT).  JAXA has determined that TRMM is now below the altitude range for which PR data can be correctly generated.

 As result, effective the stated time you will no longer receive PR NRT data. TMI will continue.

 There might be an opportunity to restart PR NRT when the satellite has descended to about 355KM.  Whether we restart will be largely dependent upon how long we will be at the appropriate altitude range.

 In short, effective October 8th, 2014 all PR data will not be available.

 

warn_icon.gif IMPORTANT MESSAGE Aug 12, 2014    [realtime] TRMM power saving and its possible impact on data distribution    

TRMM realtime users,

 For those who use TRMM PR and LIS, there will be a disruption in data availability. Cell shorts in one of TRMM's batteries necessitates that we shed significant power load right away. As a result, PR and LIS will be temporarily turned off.  We expect the instruments to return to normal observations on Thursday.  This could be the first of many times that this occurs as TRMM's batteries show their age (almost 17 years now).  Also, as TRMM continues to descend, we expect PR data to stop (around November) as TRMM drops below PR's normal operational window.  PR data would become available for a few months (estimated to be in late 2015) when TRMM falls through its original operational altitude of 350 km, assuming that the batteries are healthy enough.

Currently TMI data is not affected.

 

warn_icon.gif IMPORTANT MESSAGE Aug 11, 2014    [realtime] TRMM power saving and its possible impact on data distribution   

TRMM realtime users,

 For those who use TRMM PR and LIS, there will be a disruption in data availability. Cell shorts in one of TRMM's batteries necessitates that we shed significant power load right away. As a result, PR and LIS will be temporarily turned off.  We expect the instruments to return to normal observations on Thursday.  This could be the first of many times that this occurs as TRMM's batteries show their age (almost 17 years now).  Also, as TRMM continues to descend, we expect PR data to stop (around November) as TRMM drops below PR's normal operational window.  PR data would become available for a few months (estimated to be in late 2015) when TRMM falls through its original operational altitude of 350 km, assuming that the batteries are healthy enough.

Currently TMI data is not affected.

 

warn_icon.gif IMPORTANT MESSAGE Jul 25, 2014    Nearing the end of the TRMM Era   

From PPS: Since December 1997, TRMM and the instruments it carries have provided valuable information to researchers, the applications community, and the public.  On July 8, 2014, pressure readings from the fuel tank indicated that TRMM is at the end of its fuel.  As a result, NASA has ceased station keeping maneuvers and TRMM has begun its drift downward from its operating altitude of 402 km.

 A small amount of fuel has been retained to conduct debris avoidance maneuvers to ensure the satellite remains safe during the drift down.

 TRMM observations will continue as the spacecraft descends to 335 km, at which time it will be shutdown prior to re-entry.

This date is nominally estimated to be February 2016, but may change depending on solar activity.  While TMI and LIS will continue operating during the entire drift down period, the TMI data will be affected. TMI incidence angle will be changing as will the field of view. Users should adjust their use of TMI data to reflect these changing values. However, we expect useful data to continue especially for non-climate research.

 JAXA has indicated that they may soon stop distribution of the radar data since useful science data is only possible within narrow altitude ranges near 400 and 350 km. When TRMM reaches 350 km (its original altitude), radar data may resume for a short period.

warn_icon.gif IMPORTANT MESSAGE Jul 23, 2014    TRMM DSC (Deep Space Calibration) Jul. 22, 2014 and TMI Data   

From PPS: TRMM underwent a DSC (Deep Space Calibration) for the TMI instrument on Tuesday July 22, 2014.  This maneuver impacted the following orbits/granules:

 95022-95027 (12:09:44 - 21:23:59 UTC)

 Please be aware that these data are being distributed as regular products and NOT empty granules replacements.

These data products also contain useful sections of DSC data as well as earth view data.

 

warn_icon.gif IMPORTANT MESSAGE May 19, 2014    IMPORTANT: TRMM Data Rollback and Replacement for May 17, 2014 (DOY 137)   

 

 

Dear Science User,

PPS is rolling back and replacing certain TRMM PR data products for May 17, 2014 (DOY 137).

The following files were affected and have been replaced:

1A21

1B21

1C21 & BROWSE

2A21 & BROWSE

2A23 & BROWSE

2A25 & BROWSE

If you had obtained any of the TRMM data products earlier that are listed (above) for May 17, 2014 - either through Standing Order/s or directly from our archives , please discard this data and use the current replacement products.

 This rollback and  replacement was necessary because PACOR notified us that missing packets were recovered and an improved Level Zero PR_2 file (L0PR.140517.2) was available for that date.  PPS Processing had already concluded for that day since the Level Zero PR_2 data met criteria.

 Thank you for your patience and understanding.  Please let us know if you have any concerns or questions.

 

 

 

warn_icon.gif IMPORTANT MESSAGE Apr 04, 2014    TRMM Level 3 Products for February 2014   

Due to the recent hardware issue, we noticed that all TRMM Level 3 products for February 2014 were missing.  We will be processing and replacing these products shortly.  If you have a standing order/s for any of these, then you will receive another data notification for these products after they are archived.

 The products being replaced include:

 3All

3A12

3A25

3A26

3B31

& Browse.

 If you had already obtained this data, then you do not need to take any further action, since the data being replaced is identical.  We apologize for any confusion that this may cause.

 Please let us know if you have any concerns or questions.   Thank you

for your patience and understanding.

 

 

warn_icon.gif IMPORTANT MESSAGE Apr 03, 2014    IMPORTANT: TRMM Data Processing Delay (Processing Resumed)   

PPS TRMM processing was restarted today and all TRMM data products are now up to date and available. Thank you very much for your patience during this period. Please let us know if you have any questions or experience any discrepancies.

warn_icon.gif IMPORTANT MESSAGE Apr 02, 2014    IMPORTANT: TRMM Data Processing Delay   

PPS will temporarily delay the production of TRMM data processing due to hardware issues.  We are awaiting a resolution from the responsible hardware vendor and hope to resume processing as soon as possible, starting with TRMM data products for March 31, 2014.

We apologize for this inconvenience and appreciate your patience during this time.  PPS will keep you updated with any new developments.

 

warn_icon.gif IMPORTANT MESSAGE Mar 28, 2014    VIRS to stay off   

From PPS: At a meeting of the FOT and power engineers, the battery anomaly was discussed.  Because of the load shedding made possible by turning off VIRS, battery 1 is fully recovered.  Both battery 1 and battery 2 are charging nominally.  Battery 2 is running at a higher temperature than before. There was still some concern expressed that if VIRS was turned on, then during certain orbits and certain beta angles, the charging anomaly might reoccur.

 Discussion followed concerning the effect of potentially having to turn VIRS on and off (as a load shedding approach during certain times) on remaining battery life.  With a 16 plus year old battery, this now may become the limiting factor on a longer TRMM mission.

 Since the prime science goal is to keep the 2 prime instruments (TMI and PR) working as long as possible,  the key goal seems to be to lessen the load on the battery.  So we need to minimize the possibilities of further anomalies, lower the battery charging load, and generally decrease demand on the batteries.  As a result, the science team made the decision at this time to keep VIRS turned off.

 We would be interested in hearing from users what the impact this has on you and your research.  Also, we would welcome TRMM science user's input as to the effect of this VIRS outage on their work vs. the desirability of extending operation of TMI and PR.

 We do want our users to know there is no absolute analytical way to determine the remaining life in the batteries.  Also, there is no analytical way to establish how much additional life would be added by the battery load reduction but there was general consensus among the experts that it would increase the life of the battery.

The Flight Operations Team and power specialists will continue to monitor the battery.

The power team is also going to look at life cycle testing done during TRMM development to see what, if anything that might add to the understanding of the on-board battery remaining capacity.

 Accordingly, the TRMM science team has made the decision that for the time being, the VIRS instrument will remain off.

 

 IMPORTANT MESSAGE Mar 26, 2014    Update on VIRS and battery anomaly

From PPS: The battery situation aboard TRMM has stablized with the loadshedding.

Currently both batteries are in a nominal state. The FOT is studying other possible ongoing load shedding activities short of turning off an instrument. They are also studying the proper procedures for turning on VIRS (this hasn't been done since 2001).

 The current plans call for VIRS to be turned on sometime next week. The batteries will then be monitored to see if charging remains nominal. Should charging anonmalies appear again, it will be necessary to shutdown VIRS again.

 

IMPORTANT MESSAGE Mar 24, 2014    Important: VIRS has been turned off for the time being

From PPS: Due to a battery charging anomaly on TRMM, VIRS has been turned off (3/21

17:02 UTC)  as part of a load shedding approach for dealing with the

charging anomaly.

 

This approach seems to be working well as battery charging is returning to

normal.

 

TMI, PR and LIS remain on and continue to provide NRT data.

  

Note will be sent out when the situation changes.

warn_icon.gif IMPORTANT MESSAGE Mar 26, 2014    Update on VIRS and battery anomaly   

From PPS: The battery situation aboard TRMM has stablized with the loadshedding.

Currently both batteries are in a nominal state. The FOT is studying other possible ongoing load shedding activities short of turning off an instrument. They are also studying the proper procedures for turning on VIRS (this hasn't been done since 2001).

 

The current plans call for VIRS to be turned on sometime next week. The batteries will then be monitored to see if charging remains nominal. Should charging anonmalies appear again, it will be necessary to shutdown VIRS again.

 

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