Physics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.3243h&link_type=abstract
Journal of Geophysical Research, vol. 82, Aug. 1, 1977, p. 3243-3250.
Physics
14
Annual Variations, Ionospheric Disturbances, Wind Profiles, Diurnal Variations, F 1 Region, Ionospheric Electron Density, Night Sky, Oscillations, Propagation Modes, Vertical Distribution
Scientific paper
Neutral-wind observations over the 100- to 200-km height region at Arecibo are presented for a summer, an equinox, and a winter period. Observations confirm that the wind below 110 km is predominately diurnal, with a vertical wavelength of about 200 km, and can be identified with the S 1,1 mode. This tide reaches amplitudes of 100 m/s near 100 km but exhibits large day-to-day and seasonal variation. The vertical energy flux associated with the S 1,1 mode is of the order of 0.25 erg/sq cm per sec at 100 km. A semidiurnal oscillation dominates the wind field from about 115 km to at least 170 km during the summer and equinox observations. A nighttime intermediate layer of enhanced electron density consistently descends through the F1 valley in the postsunset hours along the convergent null in upward velocity associated with the semidiurnal winds. The S 2,2 mode dominates the semidiurnal oscillation above 125 km during these periods, reaching a maximum amplitude of 90 m/s at 153 km. Higher-order modes contribute to the semidiurnal oscillation principally below 125 km during spring and summer but appear to dominate at all heights in the winter observations, when the S 2,2 mode appears to be largely absent. The vertical energy flux associated with the S 2,2 mode is at least an order of magnitude less than that associated with the S 1,1 mode.
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