Fig. 3
Curves of marginal instability for Ω ∝ 1 /R2 if rin = 0.5, i.e., μ = 0.25. For small magnetic Prandtl numbers, the curves scale with Re and Ha. For Pm = 1, the critical Reynolds number is (only) 100. The dotted lines mark the line of maximum growth rates. The dashed line represents, for Pm = 1, the lower limit of the condition (5).
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