Physics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jastp..61..479d&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 61, Issue 6, p. 479-489.
Physics
8
Scientific paper
The ambipolar diffusion equation for the height distribution of electron density in the ionospheric F2-layer is solved in the presence of neutral horizontal shear flow. By using this nonstationary solution the reaction of the F2-region electron density on the evolution of atmospheric acoustic-gravity waves (AGW) is investigated. The evolution of the AGW and the corresponding behaviour of the height distribution of the F2-region electron density are described by the characteristic time, ta, of transient development of shear waves in the horizontal shear flow. For long times t > ta, the gravity wave frequency tends to the isothermal Brunt-Väisälä frequency, which appears in the F2-layer as wavelike behaviour of hmF2 and NmF2 with periods close to 16-20 min, when the scale height of the neutral gas is H = 60 km. The shear wave, which is due to the presence of horizontal shear flow, gives sufficient changes of the height profile of electron density for times of t <= ta.
Didebulidze G. G.
Pataraya Avtandil D.
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