TRMM completed its nominal three year mission in January 2001, and is continuing to operate. Based NASA's latest mission analysis,
TRMM lifetime will be 1.5 years shorter than the previous estimate. NASDA and NASA decided to raise the satellite altitude to 400 km in order to extend its lifetime.
Standard algorithms require several modifications for operation at 400 km altitude, and TRMM standard products will not be available during
the modifications. Standard products during this term will be processed after the data release. The current boost plan and data delivery schedule are shown below.
[ Schedule of orbit raising ]
August 7, 2001 Start raising the satellite altitude
August 13, 2001 Finish raising the satellite altitude
[ Scheduled data release ]
||Near Real-Time Product
||August 21, 2001
[ Scheduled data release for TRMM PI* ]
* : Researchers selected in the 3rd TRMM Research Announcement.
||September 7, 2001
|TMI, VIRS, LIS
[ Impacts of raising the satellite altitude ]
- Satellite bus, TRMM Microwave Imager (TMI), Visible Infrared Scanner (VIRS), and Lightning Imaging Sensor (LIS)**
NASA confirmed the satellite and above listed sensors would be reliable after the change of orbit altitude.
** : The Clouds and the Earth's Radiant Energy System (CERES) ceased observation in June 2001.
- Impacts of raising the satellite altitude for Precipitation Radar (PR) are;
- Degradation of received power,
- Possible noise interference in the data by mismatch of transmit-to-receive pulse,
- Possible degradation of observable echo top height.
NASDA concluded that these impacts will not serious by influence research using PR data.
Please see the following documents for further information.