Physics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phflb...3..479b&link_type=abstract
Physics of Fluids B (ISSN 0899-8221), vol. 3, Feb. 1991, p. 479-484. Research supported by NASA.
Physics
12
Differential Equations, Earth Magnetosphere, Field Aligned Currents, Geomagnetic Tail, Plasma Equilibrium, Electric Fields, Magnetopause, Plasma Currents, Solar Wind
Scientific paper
A three-dimensional equilibrium theory for stretched plasma configurations, such as the earth's magnetotail, is extended to include the effects of field-aligned flow. The MHD equations for this case can be solved in a general way by reduction to a set of ordinary differential equations and an ordinary integral. The solutions represent lowest-order solutions of an asymptotic expansion of the MHD equations for small electric field and weak time dependence. Simplified equations are presented for two-dimensional equilibria and for incompressible flow. Possible magnetospheric applications include the configuration of the geotail near and beyond the termination of the closed field line region, the steady motion of a plasmoid (a plasma bubble severed from the earth) through the distant geotail, and configurations at the magnetopause, the interface between the magnetosphere and the shocked solar wind plasma. For illustration, solutions for the steady motion of a two-dimensional plasmoid through the distant magnetotail are presented.
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