Nonlinear Evolution of Resistive Tearing-Mode Instability in Anisotropic Plasmas

Details Nonlinear Evolution of Resistive Tearing-Mode Instability in Anisotropic Plasmas Nonlinear Evolution of Resistive Tearing-Mode Instability in Anisotropic Plasmas

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11b0812c&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM11B-0812

Physics

Plasma Physics

7800 Space Plasma Physics, 7835 Magnetic Reconnection, 7839 Nonlinear Phenomena, 7843 Numerical Simulation Studies

Scientific paper

Recently we have carried out a systematic study of the pressure anisotropy effects on the linear resistive tearing-mode instability based on the double-polytropic MHD model (Chiou and Hau, 2001). The results show that for the parameter regime where the mirror instability criterion is satisfied the linear growth rate may be greatly enhanced and the tearing perturbation no longer grows purely exponentially but contains oscillation that may be interpreted in terms of two oppositely traveling growing modes. In this study we examine the resistive tearing mode instability in anisotropic plasmas based on the nonlinear double-polytropic MHD simulations. The method adopted is similar to that of Hau and Chiou (J. Geophys. Res., 106, 8371, 2001), namely, the linear numerical MHD code is first applied to nurture the eigenfunctions of the instability that are then used as initial perturbations of the nonlinear numerical MHD code to allow the full evolution of resistive tearing-mode instability. Preliminary results show that the oscillatory behavior derived from the linear theory may not sustain in the nonlinear regime.

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