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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.

 

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
Orbit
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).


Instruments

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.


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