Latitudinal structures of discrete arcs resulting from viscous interaction between sheared plasma flows

Details Latitudinal structures of discrete arcs resulting from viscous interaction between sheared plasma flows Latitudinal structures of discrete arcs resulting from viscous interaction between sheared plasma flows

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35.1009y&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, Aug. 1987, p. 1009-1020.

Physics

8

Earth Magnetosphere, Magnetohydrodynamic Flow, Shear Flow, Viscous Flow, Auroral Zones, Current Density, Earth Ionosphere, Electron Acceleration, Field Aligned Currents, Ionospheric Currents, Magnetosphere-Ionosphere Coupling

Scientific paper

The role of viscous interactions between sunward and antisunward magnetospheric plasma flows in quasi-steady magnetosphere-ionosphere (MS-IS) coupling is investigated by means of numerical simulations, modeling the latitudinal structures of discrete arcs. Model assumptions include MS-IS current conservation, adiabatic electron motion along magnetic-field lines, and maintenance of upward and downward field-aligned currents by vorticity-induced space charges in the flow-reversal region. An effective conductance due to anomalous viscosity is introduced, and an expression relating the dc field-aligned current density to the magnetospheric electric field is obtained. A diagram of the model MS-IS system is provided, and the results are presented in graphs. The dominant role of a magnetospheric potential structure (of characteristic width about 10 km) in determining the arc latitudinal structure is demonstrated.

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