Self-excitation of auroral arcs in a three-dimensionally coupled magnetosphere-ionosphere system

Details Self-excitation of auroral arcs in a three-dimensionally coupled magnetosphere-ionosphere system Self-excitation of auroral arcs in a three-dimensionally coupled magnetosphere-ionosphere system

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..717w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, July 1988, p. 717-720.

Physics

30

Auroral Arcs, Ionospheric Currents, Magnetosphere-Ionosphere Coupling, Self Excitation, Space Plasmas, Electrostatic Waves, Field Aligned Currents, Ionospheric Electron Density, Plasma Layers, Self Consistent Fields

Scientific paper

This paper presents the first full three-dimensional dynamic simulation of auroral arc formation. The magnetospheric and ionospheric dynamics are represented by one-fluid magnetohydrodynamic equations and two-fluid weakly ionized plasma equations, respectively. The feedback coupling between magnetospheric Alfven waves and ionospheric density waves results in a spontaneous generation of longitudinally elongated striations of field-aligned currents and ionospheric electron densities, which compare very well with many features of quiet auroral arcs.

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