Physics – Geophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984toas.rept.....b&link_type=abstract
Unknown
Physics
Geophysics
Atmospheric Tides, Diurnal Variations, Earth Atmosphere, Mesosphere, Optical Radar, Sodium, Atmospheric Chemistry, Earth Tides, Geophysics, Lunar Tides
Scientific paper
The vertical distribution of atmospheric sodium produced by diurnal and semidiurnal tides was measured. Average time variations of the sodium density show strong oscillations with 12 and 24 hour periods. Both the diurnal and semidiurnal components of the oscillation display large amplitudes and a 180 deg phase inversion near the layer peak. The propagation of tides in the layer, taking into account the interaction between the tide and the minor constituent layer is outlined. It is shown that the vertical wind is the most important factor which determines the amplitude of the oscillation in sodium density at a fixed height, thus making it possible to estimate the phase and amplitude of the wind oscillations over a limited height range. The 12 hour component shows vertical phase propagation with a wavelength of -50 km. The 24 hour component, however, shows characteristics of an evanescent mode instead of the expected S2,2 mode. Maximum upward vertical velocity occurs at about 2100 LT at all heights for the diurnal component, and at 0600 and 1800 LT at 85km for the semidiurnal component.
Batista Pedro
Clemesha Barclay R.
Kirchhoff W. J. H. V.
Simonich Dale M.
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