Upper atmosphere research satellite
From AMS Glossary
Upper Atmosphere Research Satellite
(Abbreviated UARS.) A satellite designed to study the chemistry, dynamics, and energetics of the stratosphere, mesosphere, and lower thermosphere.
UARS was launched in September 1991. UARS instruments include the cryogenic limb array etalon spectrometer, an improved stratospheric and mesospheric sounder, a microwave limb sounder, a halogen occultation experiment, a high-resolution Doppler imager, a wind imaging interferometer, a solar–stellar irradiance comparison experiment, a solar ultraviolet spectral irradiance monitor, a particle environment monitor, and the active cavity radiometer irradiance monitor.