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R. J. Stening, C. E. Meek, and A. H. Manson

Abstract

Six years of winds data measured by the partial reflection drifts technique have been analyzed for lunar tides. Data are available at 3 km intervals of height and are separately analyzed in two year datasets to cheek consistency. A month-by-month seasonal variation is derived. Largest amplitudes of the lunar tide occur in January–February with a smaller maximum in summer. The vertical wavelength is longest in summer, and the tide then resembles that predicted for a pure (2, 2) mode. In winter vertical wavelengths range from 25 to 81 km in different years. Several of these results do not agree with the model of Forbes. An O1 component of the lunar tide could not be detected.

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R. J. Stening, C. E. Meek, A. H. Manson, and D. G. Stephenson

Abstract

The results of partial reflection radiowave wind observations (60-110 km) for four 10-day intervals in 1976 at Saskatoon, Canada (52°N, 107°W), are presented. A harmonic analysis has been applied to data for the four seasons: the means of the semi-diurnal and diurnal components are in reasonable agreement with other measurements at similar latitudes. There are large day-to-day variations in the amplitudes and phases of the tides. The seasonal variations of mean winds (Gregory and Manson, 1975a) are not appreciably altered by the removal of tidal components. Gravity waves with periods ∼5 h are identified and the periods are found to vary with the mean background wind. The mechanism involved is not understood. An oscillation with a 2-day period is found in August and a similar oscillation is seen in stratospheric temperatures near 20 km.

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