Abstract
The Garchy meteor radar has now yielded a very large amount of data, which are used to draw up a detailed picture of the general mean and seasonal averages of the semi-diurnal and diurnal tides in the 80–100 km altitude range. The semi-diurnal tide is generally dominated by the fundamental, S 2 ω 2,2 mode, but higher-order modes prevail in winter, and spring and autumn averages cannot both be described by a single ‘equinoctial’ model. The diurnal tide is alternately dominated by the S ω 1,1 mode and by evanescent modes (in summer). Comparisons with theoretical predictions show off strong disagreements. Short-term variations of the tides are investigated with the help of two-dimensional spectral analysis and regression methods: several cases of complex tidal structure can be interpreted as reflection or wave superposition phenomena.
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