Fig. 1
Neutral stability for negative β and for μB = 2. Top: the curves are marked with their mode number m. The minimum Hartmann number of the toroidal field with Ha = 57.6 exists for |β| = 8 (thin horizontal line). Bottom: Hartmann number as a function of the azimuthal wave number m. Note the clear minimum for medium m > 1. Both plots are valid for all magnetic Prandtl numbers.
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