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Anomalous transport in discrete arcs and simulation of double layers in a model auroral circuitThe evolution and long-time stability of a double layer 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 re-distribution 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. 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 1-d 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.
Document ID
19870057876
Document Type
Reprint (Version printed in journal)
Authors
Smith, Robert A. (Science Applications International Corp. McLean, VA, United States)
Date Acquired
August 13, 2013
Publication Date
May 1, 1987
Publication Information
Publication: Laser and Particle Beams
Volume: 5
ISSN: 0263-0346
Subject Category
PLASMA PHYSICS
Funding Number(s)
CONTRACT_GRANT: NASW-3947
Distribution Limits
Public
Copyright
Other