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- The TIMED Doppler Interferometer (TIDI) is investigating the dynamics and
energetics of the Earth's mesosphere and lower-thermosphere. TIDI measurements
allow us to obtain a global description of the vector wind fields, as well as
important information on gravity waves, species densities, airglow and auroral
emission rates and noctilucent clouds. TIDI provides basic information about
global winds. TIDI also contributes to the study of energetics.
The TIDI interferometer (or Profiler) primarily measures horizontal vector
winds from the Earth's limb, with a vertical resolution 2.5 km and with an
accuracy that approaches ~3 m/sec under optimum viewing conditions. The TIDI
design allows for 100% duty cycle instrument operation during daytime,
nighttime, and in auroral conditions. TIDI views emissions from OI 557.7 nm and
O2(0-0) to determine Doppler wind.
TIDI comprises three major subsystems: four identical telescopes, a Fabry-Perot
interferometer with a CCD detector, and an electronics box. Light from the
selected regions of the atmosphere is collected by the telescopes and
fiber-optically coupled to the detection optics. The four fields of view are
scrambled along with a calibration field input and converted to an array of
five concentric circular wedges. This input then passes through a selected
filter, then through a Fabry-Perot etalon, and is finally imaged onto a CCD via
a circle to line imaging optic (CLIO) device.
Website: http://tidi.engin.umich.edu/
[Summary provided by the University of Michigan.]
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