Generation of a quiet auroral arc

Computer Science

Scientific paper

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Auroral Arcs, Ionospheric Currents, Ionospheric Electron Density, Magnetospheric Electron Density, Space Plasmas, Electron Acceleration, Electron Precipitation, Ion Production Rates, Ionospheric Conductivity, Plasma Density

Scientific paper

It is shown that a system of inclined currents arising above a high-density strip in the ionosphere moving relative to the magnetospheric plasma produces a shift in the maximum of the ion-production function q relative to the maximum of the j sub z longitudinal current at the ionospheric level provided that there exists in the magnetosphere a region where the occurrence of longitudinal currents is accompanied by a longitudinal electric field. The occurrence of this phase shift between q and j sub z leads to the development of a disturbance having the form of a density hill propagating in the ionosphere; on one of the slopes of this hill there exists a stream of accelerated electrons precipitating into the ionosphere, which produces an auroral arc and sustains the high plasma density within the hill. This mechanism can explain the occurrence of single auroral arcs.

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