Physics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..789a&link_type=abstract
Geophysical Research Letters, vol. 9, July 1982, p. 789-792.
Physics
20
Equatorial Atmosphere, Gravity Waves, Ionospheric Electron Density, Ionospheric Propagation, Spread F, Wind Shear, Ionospheric Drift, Richardson Number, Thermosphere, Vertical Distribution, Wind Velocity
Scientific paper
Recent observations have shown that, prior to the onset of equatorial spread-F, there exists an altitude modulation in bottomside F-region electron density contours. It has generally been accepted that such a modulation is caused by internal-gravity waves propagating upward from below. This paper suggests that gravity waves may be generated in situ, via the wind shear mechanism. Theoretical calculations and some observations indicate that large wind shears can occur during early evening hours in the low latitude thermosphere. It is shown that the wind shear may possibly generate gravity waves with horizontal wavelengths on the order of a few hundred kilometers, which is the scale of the observed electron density modulation.
Anderson Dale N.
Balsley Ben B.
Biondi Manfred A.
Richmond Arthur D.
Roble Raymond G.
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