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Welcome to the National Center for Atmospheric Research, High Altitude Observatory
web site supporting the TIMED Doppler Interferometer (TIDI) instrument.
The Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) satellite is a NASA Office of Space Sciences Sun-Earth Connection (SEC) mission to study the mesosphere and lower thermosphere from about 60 to 180 km altitude, and understand how solar variability and lower atmosphere processes combine to make this one of the most dynamic and variable regions of the terrestrial atmosphere. TIMED carries four instruments, a Global Ultraviolet Imager (GUVI), an infrared limb-sounder (SABER), a solar ultraviolet spectrometer (SEE), and a Fabry-Perot interferometer (TIDI). Data are available through the TIMED Mission Data Center and the individual instrument web sites. TIDI performs ultra-high-spectral-resolution measurements of airglow layers in the mesosphere and lower thermosphere in order to measure winds and temperatures using the doppler shifts and line shapes of spectral features. The instrument was built at the University of Michigan Space Physics Research Lab (SPRL), and is operated as a collaborative project between SPRL and HAO/NCAR. The SPRL TIDI web site contains instrument design information, operational engineering data, and an archive of data products. The HAO/NCAR site provides additional instrument and operational information, PDFs of some project documents and recent presentations, and preliminary wind data. Please observe the caveats pertaining to the use of these data, and follow the TIMED mission "Rules of the Road". |
