Physics
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59.1757r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, v. 59, p. 1757-1777.
Physics
9
Scientific paper
The climatologies of tidal wind fields in the 80-105 km region using Meteor Wind Radar (MWR) observations during June 1984-1988 at Trivandrum (8.5°N) are presented. The most significant feature revealed by the amplitude and phase profiles of the tidal winds is the simultaneous presence of two modes, differing in vertical wavelengths, for each oscillation. In contrast to the expected (1,1) mode, the (1,-2) diurnal mode is found to be stronger. In addition to the stronger (2,2) semi-diurnal mode, higher order modes are also found to be significant. The 24 h oscillation is found to be the strongest component and 12 h and 8 h oscillations are equally significant. The tidal wind amplitudes over Trivandrum are found to be larger during the equinoctial months. The amplitudes and vertical wavelengths of the two interfering modes of the 24 h, 12 h, 8 h oscillations are deduced and compared with our current theoretical understanding on tidal winds and observations from other low latitude stations.
Raghava Reddi C.
Ramkumar Geetha
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