A low-altitude mechanism for mesoscale dynamics, structure, and current filamentation in the discrete aurora

Details A low-altitude mechanism for mesoscale dynamics, structure, and current filamentation in the discrete aurora A low-altitude mechanism for mesoscale dynamics, structure, and current filamentation in the discrete aurora

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2199k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 22, p. 2199-2202.

Physics

2

Auroral Arcs, Mesoscale Phenomena, Atmospheric Physics, Ionospheric Currents, Magnetohydrodynamic Stability, Nonlinear Evolution Equations

Scientific paper

The 2D nonlinear evolution of the ionization-driven adiabatic auroral arc instability is studied. We find: (1) the adiabatic auroral arc instability can fully develop on time scales of tens to hundreds of seconds and on spatial scales of tens to hundreds of kilometers; (2) the evolution of this instability leads to nonlinear 'hook-shaped' conductivity structures: (3) this instability can lead to parallel current filamentation over a wide range of scale sizes; and (4) the k-spectra of the density, electric field, and parallel current develop into inverse power laws in agreement with satellite observations. Comparison with mesoscale auroral phenomenology and current filamentation structures is made.

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