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shepherd

Gordon G. Shepherd
Ph.D. (Toronto)
Distinguished Research Professor Emeritus of Atmospheric Science
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Research Field:
Planetary Physics

Research specialization:
Space optics instrumentation; atmospheric dynamics.


The upper atmosphere, in the region from 80 to 300 km, is where solar energy input first begins to interact with the atmosphere, producing optical emission known as airglow, and aurora. With specialized instrumentation, this emitted light can be used as a diagnostic tool to determine the properties of the atmosphere in this region. With support from CRESTech, and the Canadian Space Agency, techniques have been developed for spectral imaging of the atmosphere, yielding images of optical emission rate, temperature and wind. I am Principal Investigator for WINDII, the Wind Imaging Interferometer, a joint Canada-France instrument that has been in orbit since 1991 on NASA's Upper Atmosphere Research Satellite and is still acquiring data in orbit - over 22 million images have been acquired to date. The results are providing exciting new information on the dynamics of the upper atmosphere, and how these dynamics influence the distribution of atomic oxygen in the region. Ground-based instruments are also used, and optical observatories are maintained near Toronto, and at Resolute Bay, in Northern Canada.  New instruments are planned which will extend the range of wind measurement lower in the atmosphere, first to 45 km using molecular oxygen airglow, and then to 20 km, using thermal infrared emission. These projects are in the development stage, but have not yet been approved for flight.
 
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