Physics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.9159v&link_type=abstract
Journal of Geophysical Research, Volume 86, Issue A11, p. 9159-9169
Physics
30
Scientific paper
Mesospheric wind measurements were made by using the partial reflection technique at a tropical location (Townsville, 19° S), and at a mid-latitude location (Adelaide, 35° S) in June and November 1978. It is shown that the prevailing winds were typical of expected winter and summer type circulations in June and November, respectively, but there was a large difference in the amplitudes and structure of the diurnal tide between the two sets of observations. In November the tide was stable with a large amplitude and it appeared to 'break' at a height of 86 km. The propagating S1,1 mode dominated. In June, however, the tide was weak with large day-to-day variability and the evanescent S1,-2 mode was dominant. The semi-diurnal tide amplitudes were relatively small but internal gravity wave amplitudes were significant. Spectral analyses showed that in the 2 to 8 hour period band the wave energy decreased as f-k with k in the range 1-1.5 and it is also shown that the waves were losing energy as a function of height. The inferred energy loss rates were ~0.05 W kg-1 and a turbulent viscosity of about 500 m2s-1 was estimated near the mesopause at both sites and in both seasons.
Ball Stephen M.
Vincent Anthony R.
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