Physics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.9579g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, June 1, 1991, p. 9579-9593.
Physics
11
Auroral Zones, Computerized Simulation, Field Aligned Currents, Magnetic Field Configurations, Magnetohydrodynamic Stability, Electron Cyclotron Heating, Magnetohydrodynamic Turbulence, Magnetohydrodynamic Waves, Particle In Cell Technique, Shear Flow, Wave Reflection
Scientific paper
A new code is described with open boundary conditions for simulating electrostatic instabilities driven by field-aligned currents in narrow channels whose widths are smaller than the plasma skin depth. The reflection of Alfven waves at regions containing plasma waves coupling the electron and ion motion is found to cause a reduction of the field-aligned current and limits it to a critical value which is marginal for the excitation of electrostatic ion-cyclotron waves at a height of 1-2 R(e). Electron heating due to current-driven plasma turbulence causes the overall plasma density in the system to decrease. The plasma density in the region of upward current is enhanced relative to that in the region of downward current, and the current density in upward-directed current channels can be larger than in downward-directed ones.
Goertz Christoph K.
Nishikawa Ken-Ichi
Whelan T.
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