Slow convection of a magnetized plasma and the earth plasma sheet

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Convective Flow, Geomagnetism, Magnetohydrodynamic Flow, Plasma Layers, Field Aligned Currents, Isotropic Media, Lines Of Force, Magnetospheric Instability, Plasma Currents

Scientific paper

Stationary convection of an isotropic, infinitely conducting plasma in a magnetic field with nontrivial geometry is discussed under the assumption that the inertial term in the equation of motion may be ignored. The energy gained or lost by a volume element of plasma per unit time does not vary along the field-lines. Simple relations between the components of the current density, depending on the field-line geometry, exist. Similar relations hold for the components of the plasma velocity. The theoretical analysis is applied to the geomagnetically-quiet plasma sheet and a qualitative physical picture of the sheet is suggested. The observed structure of the sheet is compatible with Axford-Hines type of convection perhaps combined with a low-speed flow from a distant neutral point. The magnetic-field-aligned currents are driven by the deformations of the closed field-lines which are enforced by the solar wind.

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