Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1321v&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, July 1991, p. 1321-1324. Research supported by Australian Research Counc
Physics
5
Aloha System, Gravity Waves, Mesopause, Middle Atmosphere, Wind Measurement, Airborne Equipment, Atmospheric Tides, Optical Radar, Power Spectra, Vertical Distribution
Scientific paper
Wind measurements made with a partial reflection radar located on Christmas Island (2 deg N, 157 deg W) are used to describe the dynamical state of the equatorial mesopause region during ALOHA-90. Time mean westward (easterly) winds prevailed at most heights, and reached their maximum values of about -60 m/s near 85 km, but the mean meridional motions were weak. Strong oscillations due to the 24, 12, and 8 hr atmospheric tides were also observed in both wind components. The inferred vertical wavelengths were large, even for the diurnal tide. On the nights of March 22 and 25, when airborne lidar observations were made in the vicinity of Christmas Island, the prevailing and tidal winds combined to produce especially strong westward winds (-100 m/s). Gravity wave activity was also high during March/April, especially for short period waves, although considerable day-to-day variability was noted.
Lesicar Drazen
Vincent Anthony R.
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