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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.


The Tropical Rainfall Measuring Mission (TRMM) is a joint mission between NASA and the Japan Aerospace Exploration Agency (JAXA) designed to monitor and study tropical rainfall.

Instruments onboard the TRMM satellite

Basic Information

Launch Date
November 27, 1997
Circular, non-sun-synchronous, with an inclination of 35 degrees to the Equator.
Orbit Altitude

350 km (1997/11/27 - 2001/08/08)

403 km (2001/08/24 - present)

Altitude Change
During the period of 2001/8/7 to 2001/8/14, the average operating altitude changed from 350 km to 403 km (referred to also as TRMM Boost).


Below are overview descriptions of the instruments on the TRMM satellite:

Visible Infrared Radiometer (VIRS)
The VIRS (of NOAA AVHRR heritage) is a five-channel, cross-track scanning radiometer operating at 0.63, 1.6, 3.75, 10.8, and 12 um, which provides high resolution observations on cloud coverage, cloud type, and cloud top temperatures.
TRMM Microwave Imager (TMI)
The TMI (of DMSP SSM/I heritage) is a multichannel passive microwave radiometer operating at five frequencies: 10.65, 19.35, 37.0, and 85.5 GHz at dual polarization and 22.235 GHz at single polarization. The TMI provides information on the integrated column precipitation content, cloud liquid water, cloud ice, rain intensity, and rainfall types (e.g., stratiform or convective).
Precipitation Radar (PR)
The PR, the first of its kind in space, is an electronically scanning radar, operating at 13.8 GHz that measures the 3-D rainfall distribution over both land and ocean, and define the layer depth of the precipitation.

Further information on these instruments may be found on the TRMM Instruments Web page.

Latest News

Labeled MODIS image of the "Christmas Storm" of 2013.  Dr. Mark Jury used Giovanni in his analysis of this storm, which caused flooding on several islands.
Mar 23, 2015 - The March 2015 issue of The Giovanni News is online

Issue features six interesting journal papers from the latter half of 2014

+ Read More…
Giovanni shapefile image analysis for Japan, showing heavy rainfall around Tokyo due to passage of Super Typhoons Phanfone and Vongfong in October 2014.
Mar 18, 2015 - Integrated Multi-satellitE Retrievals for GPM (IMERG) data are now in Giovanni-4

Precipitation data from the Global Precipitation Measurement (GPM) mission

+ Read More…
MODIS-Aqua nighttime temperatures in Europe, June 2008, mapped with Giovanni-4.  The data is from the Land Processes DAAC, a Federated Giovanni partner.
Feb 24, 2015 - The January-February 2015 issue of The Giovanni News is online

Issue has articles on Federated Giovanni, 2014 publication count, OMI data, and "Top 10" cake

+ Read More…
IMERG data from the GPM mission provide accurate global satellite observations of rain and snow.
Feb 23, 2015 - Integrated Multi-satellitE Retrievals for GPM (IMERG) Data Released through NASA GES DISC

Data release continues heritage of TRMM with refined and improved precipitation data

+ Read More…
Radio transmitters revealed where juvenile loggerhead turtles live, in research performed with the aid of the Giovanni system.  (Picture by the University of Central Florida/Brian Boesch.)
Jan 29, 2015 - 226 scientific publications citing the Giovanni system were counted in 2014

Many different Earth science disciplines represented in research using NASA data visualization system

+ Read More…

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Last updated: May 27, 2010 04:35 PM ET