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Data from the Grahamstown (33.3 • S, 26.5 • E) meteor radar have been used to study the short-term variations of the mean flow at ∼ 90 km altitude. The results show considerable variation characterised by a superposition of fluctuations on different planetary time scales. Wavelet multi-resolution and spectral techniques reveal that the quasi-16-day oscillation dominates the wave spectrum in the ∼ 2-20-day period range. This quasi-16-day oscillation, which is thought to be related to a similardoi:10.5194/angeo-20-2027-2002 fatcat:hajn6vp7k5h6jf7atlp3lwxs3a