Tropospheric Emission Spectrometer or TES is a satellite instrument designed to measure the state of the earth's troposphere. It is an infrared Fourier Transform spectrometer and provides key data for studying tropospheric chemistry, troposphere-biosphere interaction, and troposphere-stratosphere exchanges. TES is built for NASA by the Jet Propulsion Laboratory, California Institute of Technology in Pasadena, California. It was successfully launched into polar orbit aboard NASA's third earth Observing Systems spacecraft (EOS-Aura) at 10:02 UTC on July 15, 2004.
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