How many and what types of instruments are onboard the spacecraft?
TIMED’s payload consists of four instruments. The Global Ultraviolet Imager (GUVI) is a spatial scanning ultraviolet spectrograph designed to measure the composition and temperature profiles of the MLTI region, as well as its auroral energy inputs. The Solar Extreme Ultraviolet Experiment (SEEis comprised of a spectrometer and a suite of photometers designed to measure the solar soft X-ray, extreme-ultraviolet, and far-ultraviolet radiation that is deposited into the MLTI region. The TIMED Doppler Interferometer (TIDI) is designed to measure the winds and temperature profiles of the MLTI region. And a multichannel radiometer known as SABER (Sounding of the Atmosphere using Broadband Emission Radiometry) is designed to measure the pressure, temperature, key gases in the oxygen and hydrogen families, infrared cooling, and effects of solar and chemical heating of the MLTI region.