The propagation of the mesospheric two-day wave in the southern hemisphere |
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Affiliation: | 1. Technische Universität Dresden Institute for Transport & Economics, Würzburger Str. 35, 01062 Dresden, Germany;2. TomTom Development Germany, An den Treptowers 1, 12435 Berlin (Germany) |
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Abstract: | The results of an analysis of mesospheric wind data collected simultaneously at Grahamstown (South Africa) and Adelaide (South Australia) during the summer appearances of the quasi-two-day wave over a period of eight years are presented and discussed. It is concluded that the apparent zonal wave-number k which characterises the westward travelling wave is significantly less than the value of 3 suggested by current theories. Differences in local conditions and/or observing techniques are found to be unlikely causes of the discrepancy. It is shown that these results, as well as certain global features observed by satellite, could arise as a result of the superposition of modes with different k but similar frequencies. |
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