Mathematics – Probability
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982p%26ss...30....1l&link_type=abstract
Planetary and Space Science, vol. 30, Jan. 1982, p. 1-4.
Mathematics
Probability
14
Auroral Arcs, Electric Fields, Ionospheric Currents, Ionospheric Disturbances, Ionospheric Electron Density, Plasma Density, Convective Flow, Ionospheric Conductivity, Magnetohydrodynamic Flow
Scientific paper
A theory of solitary auroral arc generation is proposed, which is based on the existence of inclined currents over the arc and on the generation by these currents of a field-aligned electric field at some distance from the ionosphere. The ionospheric density disturbance associated with the arc is a plasma hill whose width exceeds that of the arc; the arc is situated on the front slope of this plasma hill. If the arc lies east to west, the probability of its generation is least in the early morning, while the most favorable conditions for generation occur in the evening. The arc velocity differs from the plasma convection velocity; in the late morning it is directed towards the equator and exceeds the convection velocity, while in the evening it is less than the convection velocity and may even be directed towards the pole.
Leont'ev S. V.
Liatskii V. B.
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