The 16-day variation in the mean flow at Grahamstown (33.3° S, 26.5° E)

Details The 16-day variation in the mean flow at Grahamstown (33.3° S, 26.5° E) The 16-day variation in the mean flow at Grahamstown (33.3° S, 26.5° E)

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002angeo..20.2027m&link_type=abstract

Annales Geophysicae, vol. 20, Issue 12, pp.2027-2031

Physics

1

Scientific paper

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 similar oscillation in the lower atmosphere, is found to be dominant in winter and the equinoxes. However, it is sometimes significant in summer, which could be due to cross-equatorial ducting and the selective transmissivity of gravity waves.

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