A mathematical model of the structure and evolution of small-scale discrete auroral arcs

Details A mathematical model of the structure and evolution of small-scale discrete auroral arcs A mathematical model of the structure and evolution of small-scale discrete auroral arcs

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9517199s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Oct. 1, 1990, p. 17199-17215.

Physics

89

Auroral Arcs, Dynamic Models, Earth Ionosphere, Electrostatic Waves, Mathematical Models, Plasma Dynamics, Current Density, Digital Simulation, Power Spectra, Steady State

Scientific paper

A three-dimensional fluid model for the structure and evolution of small-scale discrete auroral arcs originating from Alfven waves is developed and used to study the nonlinear macroscopic plasma dynamics of these auroral arcs. The results of simulations show that stationary auroral arcs can be unstable to a collisionless tearing mode which may be responsible for the observed transverse structuring in the form of folds and curls. At late times, the plasma becomes turbulent having transverse electric field power spectra that tend toward a universal k exp -5/3 spectral form.

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