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Upper Atmospheric Research Satellite


Designation 21701 / 91063B
Launch date 12 Sep 1991
Country of origin United States
Mission Scientific: high atmosphere study
Perigee/Apogee 555/586 km
Inclination 56.9°
Period 96 min
Launch vehicle STS 48

Mission: systematic study of Earth's stratosphere, mesosphere and lower thermosphere with specialized payloads. Cost: $630 million. It should be followed up by EOS Chemistry 1 in 2003.

End of life

Out of service late 2005
Decay 24 Sep 2011 (in south Pacific)

External resources


sat-index articles

Technical data


Prime contractor GE Astro
Platform MultiMission Spacecraft bus
Mass at launch 6800 kg (2500 kg for the payload)
Diameter 5 m
Height 10 m
Solar array 1.5 x 3.3 m
Stabilization 3 axis
Design lifetime 3 years

Telemetry: 2287.5 MHz (realtime: 32/1 kbps, playback: 512 kbps)
Command: 2106.4 MHz (1/0.12 kbps)

CLAES (Cryogenic Limb Array Etalon Spectrometer)

Vertical profiles of minor species (between 10-60 km)

HALOE (Halogen Occultation Experiment)

Vertical distribution of minor species in stratosphere

ISAMS (Improved Stratospheric and Mesospheric Sounder)

Temperature and ozone concentrations in stratosphere and mesosphere

MLS (Microwave Limb Sounder)

ozone and other trace gases in stratosphere and mesosphere

HRDI (High Resolution Doppler Imager)

Horizontal windspeeds and temperature in upper troposhere and thermosphere

WINDII (Wind Imaging Interferometer)

Windspeed and temperature in mesosphere and lower thermosphere

PEM (Particule Environment Monitor)

Global input of charged particle energy

SOLSTICE (Solar Stellar Irradiance Comparison Experiment)

Full disk solar UV irradiance

SUSIM (Solar UV Spectral Irradiance Monitor)

solar irradiance, solar flux variability

ACRIM 2 (Active Cavity Radiometer Irradiance Monitor)

wide band total solar irradiance

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