Effects of Line-Tying and Non-Uniformities on Thermal Instabilities and Slow MHD Modes
The thermal stability of a planar plasma is studied both analytically and numerically for two different models. For τ rad /τ ⊥ « 1, the growth rate for the thermal instabilities with small wavelengths perpendicular to the magnetic field lines is essentially the same as for the most unstable mode, i.e., a mode with large perpendicular wave length. This could indicate that the instability might be triggered by a mode with small scale structure across the magnetic field. When the magnetic field vanishes locally, localized modes exist.
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