Specific growth rates of kink waves propagating along an untwisted/twisted magnetic flux tube at η = 2, Be/Bi = 0 (left panel), Be/Bi = 0.1 (middle panel), and Be/Bi = 0.5 (right panel) for various values of the twist parameter Biφ/Bi, equal to 0 (red curve), 0.1 (green curve), and 0.4 (blue curve), respectively. The curve labels denote the threshold Alfvén-Mach number.
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