Physics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..127t&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, Feb. 1984, p. 127-134.
Physics
68
Atmospheric Stratification, Auroral Arcs, Convective Flow, Ionospheric Currents, Magnetospheric Instability, Space Plasmas, Atmospheric Effects, Current Sheets, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Magnetosphere-Ionosphere Coupling
Scientific paper
A detailed study of the mechanism of electromagnetic stratification of the large-scale stationary magnetospheric convection due to a friction of the convective flow in the ionosphere layer was performed. Magnetosphere-ionosphere interaction was taken into account by means of the effective boundary conditions on the ionosphere top and bottom boundaries including the actual height profile of charge particles velocity in the ionosphere. It has been shown that the magnetospheric convection is stratified into small-scale current sheets which are respective in the linear approximation to an oblique Alfven wave. The dispersion equation was deduced for the Alfven mode and its solution obtained determining the space-time scales and the increment of instability. The maximum increment is realized for the disturbances stretched along the convection velocity that is correspondent to the actual orientation of the auroral arcs. In the conditions of rapid growth of Alfven velocity above the maximum of the ionosphere F layer, it was shown that small-scale disturbances with the transverse scales approximately equal to or less than 1 km are localized at the altitudes up to several thousand kilometers whereas the large-scale stratification penetrates into the equatorial plane of the magnetosphere.
Feldstein Ia. A.
Trakhtengerts Iu. V.
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