Physics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.7860a&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Oct. 1, 1983, p. 7860-7866.
Physics
12
Magnetohydrodynamic Stability, Magnetospheric Instability, Neutral Sheets, Plasma Equilibrium, Space Plasmas, Tearing Modes (Plasmas), Computerized Simulation, Energy Transfer, Magnetic Disturbances, Magnetohydrodynamic Waves, Plasma Drift, Vlasov Equations
Scientific paper
A comparison is made between two classes of Vlasov equilibria with respect to the ion tearing mode instability. The first class is that of a current sheet in equilibrium with a vacuum (Harris type). The second class is that of a current sheet in equilibrium with a magnetized background plasma. The comparison is made via a simple magnetoinductive simulation involving ions alone. We find that the presence of the background species has several dramatic effects: The linear growth rates are affected, the tearing mode can be stabilized or destabilized by the background plasma, and the exchange of energy between particles and fields is affected. In particular, the saturation wave energy level of the tearing instability can be either enhanced or reduced by a factor of 10 from the Harris type depending on the depth of the penetration of the background particles into the neutral sheet.
Ambrosiano John J.
Lee Clarence L.
Swift Daniel W.
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