Abstract
A set of linearly-reduced MHD equations in toroidal geometry has been solved numerically in flux coordinate with toroidal coupling. In the case of q > 1 on the magnetic axis, where q is the safety factor, the result shows that an unstable 2/1 tearing mode destabilizes both 1/1 and 3/1 modes. The 1/1 and 3/1 modes contribute local perturbations on the resonant surface of q = 2. And the 2/1 mode also contributes a local perturbation on the resonant surface of q = 3.
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