Anomalous transport in discrete arcs and simulation of double layers in a model auroral circuit

Details Anomalous transport in discrete arcs and simulation of double layers in a model auroral circuit Anomalous transport in discrete arcs and simulation of double layers in a model auroral circuit

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987nascp2469..211s&link_type=abstract

In NASA. Marshall Space Flight Center Double Layers in Astrophysics p 211-223 (SEE N87-23313 16-88)

Physics

Auroral Arcs, Current Sheets, Electric Fields, Magnetohydrodynamic Stability, Mathematical Models, Plasma Layers, Plasmas (Physics), Simulation, Boundary Value Problems, Current Density, Electrostatics, Ion Acoustic Waves, Plasma Potentials

Scientific paper

The evolution and long-time stability of a double layer (DL) in a discrete auroral arc requires that the parallel current in the arc, which may be considered uniform at the source, be diverted within the arc to charge the flanks of the U-shaped double layer potential structure. A simple model is presented in which this current redistribution is effected by anomalous transport based on electrostatic lower hybrid waves driven by the flank structure itself. This process provides the limiting constraint on the double layer potential. The flank charging may be represented as that of a nonlinear transmission line. A simplified model circuit, in which the transmission line is represented by a nonlinear impedance in parallel with a variable resistor, is incorporated in a one-dimensional simulation model to give the current density at the DL boundaries. Results are presented for the scaling of the DL potential as a function of the width of the arc and the saturation efficiency of the lower hybrid instability mechanism.

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