A Model for an Electromotive Force Generator in the Magnetosphere: A Source of Discrete Auroral Arcs,
NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION BOULDER CO SPACE ENVIRONMENTA L LAB
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We present results obtained from solving Maxwells and Vlasovs equations to obtain the electrical structure of the sheath which separates magnetospheric particle populations of different densities and temperatures. It is shown that for reasonable magnetospheric plasma populations an electric potential difference of several kilovolts exists across such a boundary. This potential can serve as the necessary EMF for the auroral current circuit. Ths colocation between a magnetospheric plasma boundary and a discrete aurora is a natural consequence of this picture.
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