Physics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..825v&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, May 1991, p. 825-828. Research supported by Australian Research Council.
Physics
95
Equatorial Atmosphere, Mesosphere, Wind Measurement, Wind Profiles, Annual Variations, Gravity Waves, Power Spectra, Radar Cross Sections
Scientific paper
The first observations of mesospheric winds made between January-August 1990 with an MF partial reflection radar located on Christmas Island in the central Pacific are described. The mean zonal winds are in general westward, but show clear evidence for a wave-driven circulation. Power spectral studies indicate that waves are present over a wide range of periods. Ultrafast Kelvin waves are especially evident in January-March, with peak amplitudes of about 20 m/s, and intrinsic phase speeds of about 150 m/s indicated. The Kelvin waves are estimated to contribute an eastward acceleration of up to 10 m/s/day. Gravity wave amplitudes are also found to be almost as large as those observed at midlatitude sites, which suggests that convection is a major source of gravity wave activity.
Lesicar Drazen
Vincent Anthony R.
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