Mars Global Surveyor Thermal Emission Spectrometer note: "The TES spectrometer is currently being used intermittently. At this time we're no longer producing daily images or movies of 15 micron atmospheric temperature or dust opacity. The TES bolometer is still being used full-time, and we will continue to update the daytime and nighttime temperature movies."
According to the TES home page at Arizona State University: "The purpose of TES is to measure the thermal infrared energy (heat) emitted from Mars. This technique, called thermal emission spectroscopy, can tell us much about the geology and atmosphere of Mars. TES data will provide the first detailed look at the composition of Mars."
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