On the specification of TGCM tidal lower boundary conditions from radar wind measurements during the June 1984 GTMS period |
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| Institution: | 1. Department of Electrical, Computer, and Systems Engineering, Boston University, Boston, MA 02215, U.S.A.;2. University of Adelaide, Australia;3. University of Canterbury, New Zealand;4. University of Colorado, U.S.A.;5. University of Illinois, U.S.A.;6. University of New Hampshire, U.S.A.;7. Institut fur Solar-Terrestrial Physik, Kuhlungsborn, G.D.R.;8. University of Saskatchewan, Canada;9. Georgia Institute of Technology, U.S.A.;10. Radio Atmospheric Science Center, Japan |
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| Abstract: | Atmospheric tidal theory is applied to radar wind measurements of semidiurnal eastward and northward winds during June 1984 to specify the semidiurnal perturbation geopotential at lower thermosphere heights. Derived amplitudes for the longest-wavelength (2, 2) and (2, 3) tidal modes and their estimated vertical extensions are sufficiently large to modify the latitudinal structure of the thermosphere at levels of 150 km and above. These results can be used as the lower tidal boundary forcing in Thermospheric General Circulation Models (TGCM's) to incorporate the effects of upward propagating tides in simulations of the 26–28 June 1984 Global Thermosphere Mapping Study. (GTMS). |
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