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SOlar Radiation and Climate Experiment


Designation 27651 / 03004A
Launch date 25 Jan 2003
Country of origin United States
Mission Observation of high atmosphere
Perigee/Apogee 640 km
Inclination 40°
Launch vehicle Pegasus XL #33
Launch site Cape Canaveral

Operated by NASA, designed by the Laboratory for Atmospheric and Space Physics at the University of Colorado in Boulder, Colorado. Worth $85 million.

End of life

Out of service 25 Feb 2020
Cause Decommissioned

External resources

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Technical data


Prime contractor OSC
Platform Leostar-2
Mass at launch 315 kg
Mass in orbit  
Solar array  
Stabilization 3-axis
DC power EOL: 730 W
Design lifetime 5 years

S-band uplink at 2 kbps, downlink at 1.5 Mbps. TDRS compatible.

Will carry four instruments to study and measure solar irradiance, the main source of energy in the Earth's atmosphere. The SORCE programme merges two previous efforts: the Solar-Stellar Irradiance Comparison Experiment/Solar Atmospheric Variability Explorer (SOLSTICE/SAVE) mission and the Total Solar Irradiance Mission (TSIM).


Total Irradiation Monitor (TIM): covers all visual and infrared wavelengths. 7.9 kg.

Spectral Irradiance Monitor (SIM): rotating Fery prism spectrometer with a bolometer output that covers the 200-2,000 nm band at a resolution of a few nanometers. 22 kg

SOLar STellar Irradiance Comparison Experiment (SOLSTICE): UV grating spectrometers with photomultiplier detectors that cover the 115-320 nm band at a resolution of 0.1 nm. 36 kg

Xuv Photometer System (XPS): photometer to monitor the x-ray and UV band at 1-34 nm. 3.6 kg

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