Some direct comparisons of mesospheric winds observed at Kyoto and Adelaide

Physics

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Atmospheric Tides, Mesosphere, Midlatitude Atmosphere, Winds Aloft, Australia, Conjugate Points, Diurnal Variations, Japan, Vertical Distribution

Scientific paper

Direct comparisons have been made of the prevailing and tidal wind fields observed in the 80-100 km height region using data obtained with a meteor radar at Kyoto (35 deg N, 136 deg E) and a partial reflection spaced antenna system at Adelaide (35 deg S, 138 deg E). Data taken with a partial reflection system at Townsville (19 deg S, 147 deg E) have also been included so that the latitudinal variations of the tidal structures could be taken into account. The comparisons extend over periods of up to one month duration centered on the equinoxes of 1979 and the January solstice of 1980. They show that there are often significant differences in the tidal amplitudes and phases observed at Kyoto and Adelaide, despite their near geographic conjugacy, probably indicating the presence of antisymmetrical tidal modes. The diurnal tide is appreciably stronger at Adelaide on the average, than at Kyoto, whereas the semi-diurnal amplitudes are on the average greater at Kyoto.

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