Physics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985kosis..23..444v&link_type=abstract
Kosmicheskie Issledovaniia (ISSN 0023-4206), vol. 23, May-June 1985, p. 444-448. In Russian.
Physics
Approximation, Gravitational Fields, Ionospheric Ion Density, Plasma Diffusion, Plasma Dynamics, Space Plasmas, Altitude, Ambipolar Diffusion, Hydrodynamic Equations, Ionic Diffusion, Nonequilibrium Plasmas, Solar Activity Effects
Scientific paper
The transition from the hydrodynamic approximation to the hydrodynamic mode of motion of a plasma in a constant gravitational field is studied on the basis of an analysis of the equations of motion and continuity. It is shown that, for small deviations from equilibrium, the diffusion approximation can be extended to a region where the basic diffusion criteria are satisfied nonrigorously; however, this extension has a very limited character. For the ionospheric plasma the upper height limit for the applicability of the single-ion diffusion approximation does not exceed 500 km for most conditions.
Izakova T. M.
Vlasov Michael N.
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