Diurnal tide in the Antarctic and Arctic mesosphere/lower thermosphere regions |
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| Affiliation: | 1. Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand;2. Scientific Production Association “Typhoon”, Obninsk, Russia;3. Center for Space Physics and Department of Electrical, Computer and Systems Engineering, Boston University, Boston, U.S.A.;4. Department of Physics and Mathematical Physics, University of Adelaide, South Australia |
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| Abstract: | The behaviour of the diurnal tide at 95 km over various years between 1965 and 1986 is studied using radar data from Heiss Island (81°N), Mawson (67°S), Molodezhnaya (68°S) and Scott Base (78°S). The observations are also compared with the model results of FORBES and HAGAN [(1988) Planet. Space Sci. 36, 579] for the same latitudes. There are substantial fluctuations in amplitude and phase at all stations, particularly in winter. Phase fluctuations can be as large as a uniform random distribution over the 24-h cycle. In summmer the phases of the meridional components are well defined and suggest the presence of a dominant symmetric mode. The meridional amplitudes are larger in summer whereas the zonal components have a greater variation and show no significant variation with season. |
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