No rotation. The growth rate in units of the diffusion frequency runs linearly with the Hartmann number of the toroidal field. Top: β = −20. The mode with m = 2 has the highest growth rate. Bottom: β = −2 (see the vertical lines in Figs. 1 and 2). The curves are marked with their mode number m. Generally, for finite β maximum growth rates occur for m > 1. μB = 2, Pm = 1.
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