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| Titel |
The 16-day variation in the mean flow at Grahamstown (33.3° S, 26.5° E) |
| VerfasserIn |
S. B. Malinga, L. M. G. Poole |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 20, no. 12 ; Nr. 20, no. 12, S.2027-2031 |
| Datensatznummer |
250014515
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| Publikation (Nr.) |
 copernicus.org/angeo-20-2027-2002.pdf |
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| Zusammenfassung |
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.
Key words. Meteorology and
atmospheric dynamics (waves and tides) |
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