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Simple ideal MHD models for instability revisited

Minor corrections have been done on two simple and ideal MHD models for instability, viz., the fixed- and free-boundary Shafranov's [1] models. In the fixed-boundary case, the interval of values of the safety factor at the current channel radius qa for instability has been enlarged due to a second branch in the dispersion relation, not predicted in Shafranov's work. In the free-boundary case, the interval of qa for instability is still the same as in reference above but the expression for the maximum growth differs by a multiplication factor which is a function of the azimuthal mode number m. These corrections were only possible after a carefull handling of the MHD instability equations and boundary conditions in both cases simultaneously.