Abstract
Meteor radar data taken in 1978–1979 at Kyoto station (35°N, 136°E) are processed statistically by Groves' algorithm (1959). Analysis is done especially for data in two C.T.O.P. campaigns carried out in summer and in spring to study a seasonal variation of tides. The reliability of the algorithm is clarified by a simulation with a realistic model. Vertical wavelengths of the diurnal tide and the semidiurnal tide are estimated from height profiles. The diurnal tide becomes evanescent in summer, and the semidiurnal tide appears to be the S 2,2 mode in summer and the S 2,4 mode in spring. This suggestion regarding the semidiurnal tidal modes agrees with the latitudinal variation deduced from many other meteor radar data. Tidal wave energy in the meteor region is estimated. A sudden enhancement of energy is observed in both the diurnal and the semidiurnal tides. There is a clear correlation between an energy decrease of the diurnal tide and an energy increase of the semidiurnal tide.
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