Physics
Scientific paper
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.
Chaturvedi P. K.
Keskinen Michael J.
Ossakow S. L.
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