Abstract
The nondissipative two-fluid equations for singular modes are employed to investigate the singular layer modes in the toroidal geometry. By matching the solutions in the outer (ideal magnetohydrodynamics (MHD)) and the inner regions a general dispersion relation is obtained, which is able to describe both the interchange and internal kink modes. The results show that the stable modes predicted by the finite-Larmor-radius modified ideal-MHD theory can become unstable due to the parallel electric field effect. The destabilization prevails in the comparable frequency regime (i.e., for a mode frequency comparable to that of the ion acoustic wave propagating along the magnetic field lines) instead of the intermediate frequency regime. Inclusion of the toroidal effect is found to be essential to the destabilization mechanism.
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