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
satellite is a
Office of Space Sciences Sun-Earth Connection
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.
carries four instruments,
a Global Ultraviolet Imager
an infrared limb-sounder
a solar ultraviolet spectrometer
and a Fabry-Perot interferometer
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
and is operated as a collaborative project between SPRL
and HAO/NCAR. The
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".