Stationary magnetic field line reconnection in a tearing-unstable plasma slab

Physics

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Lines Of Force, Magnetic Field Configurations, Magnetohydrodynamic Stability, Plasma Slabs, Collisionless Plasmas, Current Sheets, Geomagnetic Tail, Particle Collisions, Tearing

Scientific paper

The growth of multiple waves in a plane plasma slab immersed in a sheared magnetic field is analyzed. The configuration is characterized by the presence of a strong magnetic field in a current layer, which permits the use of the drift approximation both for the particle orbits and the kinetic equations. Overlapping of magnetic islands along the singular layer created by many different modes causes the destruction of the magnetic surfaces and stochasticity of the magnetic field lines. The main nonlinear effect then enters as a stochastic change of wave phase seen by the particle moving along the disturbed magnetic field line. The nonlinear current is calculated, a nonlinear dispersion relation is found, and the collisionless reconnection rate is calculated.

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