Top panel: growth rates of an unstable m = −3 MHD mode in three instability windows. Adequate numerical values consistent with the observational data are obtained at kza = 0.696245, located in the third instability window, for which value of the dimensionless wave number the normalised mode growth rate is equal to 0.232117. Bottom panel: dispersion curves of unstable m = −3 MHD mode for three values of the twist parameter ε = 0.025, 0.1, and 0.2. The normalised phase velocity at kza = 0.696245 is equal to 1.45.
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