Comparison of the variation in the cutoff longitudinal wave number with the internal Alfvén speed, in the slab and cylindrical cases with the step-function profiles, α → ∞. The solid line represents the numerically calculated values in the slab case, and the diamonds the analytical values; the dotted line represents the numerically calculated values in the cylindrical case (Nakariakov et al. 2012), and the crosses the analytical values.
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