Abstract
An M.F. radar (2.2 MHz) operating at Saskatoon, Canada (52°N, 107°W) has been used to produce continuous wind data (∼ 80–110km) from September 1978–April 1981. The 24-, 12-h tidal oscillations reveal regular summer-winter transitions; in particular the semi-diurnal tide demonstrates strikingly regular and rapid equinoctial changes over the three years. The vernal and autumnal equinox changes are clearly different in morphology. Shorter term tidal fluctuations (2 d ≲ τ ≲ 10d) are compared with mean winds and gravity wave amplitudes, as well as with satellite-derived stratospheric temperatures. Spectral analysis of monthly data sets for 1980, from ∼ 90–105 km, reveal oscillations of the expected 8-, 12-, 24-h periods, but also of ∼ 10-, ∼16- and ∼ 2-, 5 6 d . A modulation of the “2-d” wave by the 12-h wave is suggested as a possible cause of these surprisingly regular oscillations.
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