Estimated Alfvén speed vs. aspect ratio s = x0/L, and inhomogeneity parameter α of coronal loops. Blue (red) line corresponds to the first (second) harmonic of kink waves according to Eq. (54) (Eq. (55)). The upper panel corresponds to ρ0/ρe = 5 and the lower panel to ρ0/ρe = 20. Only one line from each surface of VA0(s,α) is shown here.
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