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Meteor wind data at Grahamstown (33.3 • S, 26.5 • E) have been used to study the short-term (planetary scale) variations of the diurnal and semidiurnal tidal amplitudes at ∼ 90 km altitude. Wavelet multi-resolution and spectral techniques reveal that planetary periodicities of ∼ 10 and ∼ 16 days dominate the wave spectrum in the ∼ 2-20-day period range. The quasi-16-day oscillation is thought to be related to similar oscillations in the lower atmosphere. Also, there seems to be a link betweendoi:10.5194/angeo-20-2033-2002 fatcat:p5gbqwzjrrerjpznvv5ithiqs4