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Thermosphere, Ionosphere, Mesosphere Energy and Dynamics


Designation 26998 / 01055B
Launch date 7 Dec 2001
Country of origin United States
Operator NASA
Mission Scientific: Mesosphere and Lower Thermosphere/ ionosphere study
Perigee/Apogee 630 km
Inclination 74.1°
Period 97.3 min
Launch vehicle Delta 2 #289

It will obtain global measurements of geophysical parameters of the lower thermosphere, ionosphere, and mesosphere and will be used to determine the seasonal and annual variations of these regions. Will carry 4 instruments.

Design and development: Johns Hopkins University Applied Physics Laboratory. Cost: $193 million + $42 million for data analysis. Part of NASA's Solar Terrestrial Probe program.

The mission duration was extended repetedly through 2014.

External resources


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Technical data


Prime contractor APL
Mass at launch 587 kg
Mass in orbit  
Dimension 2.72 x 1.61 (11.73 deployed) x 1.2 m
Solar array  
Stabilization 3-axis
DC power EOL: 406 W
Design lifetime 2 years

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Timed Dopplet Interferometer (TIDI)
Solar Extreme Ultraviolet Experiment (SEE)
Souding of the Atmosphere Using Broadband Emission Radiometry (SABER)
Global Ultravionel Imager (GUVI)

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