The resistive tearing instability for generalized resistivity models - Applications

Details The resistive tearing instability for generalized resistivity models - Applications The resistive tearing instability for generalized resistivity models - Applications

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phflb...3.1746b&link_type=abstract

Physics of Fluids B (ISSN 0899-8221), vol. 3, July 1991, p. 1746-1754. DFG-supported research.

Physics

14

Earth Magnetosphere, Geomagnetic Tail, Magnetohydrodynamic Stability, Magnetohydrodynamic Turbulence, Solar Corona, Tearing Modes (Plasmas), Plasma Drift, Plasma Dynamics, Solar Flares

Scientific paper

The dispersion relation for the resistive tearing mode is investigated with a general form of the resistivity that allows for evaluating the dependence of the mode on the anomalous dissipation caused by the lower-hybrid-drift turbulence and the ion-acoustic turbulence. The coupling of the plasma dynamic and radiative processes due to a temperature-dependent Spitzer resistivity are also discussed. The dispersion relation is solved numerically for two-dimensional equilibrium configurations with applications to the earth's magnetosphere and the solar corona. In the case of the parameter regimes of the magnetopause and the solar corona, growth rates that result in realistic time scales for the respective dynamic processes as flux transfer events and solar flares were found. Moreover, the influence of a nonvanishing component of the magnetic field normal to the current sheet on the dispersion relation is examined. The normal field component leads to overstable modes and the growth rate of the pure tearing mode is not altered, whereas the radiative tearing mode is damped effectively.

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