Fig. 3
a) ωR/ωk and b) ωI/ωk for the kink mode (m = 1) as a function of νni/ωk, with ΔU/cA,0 = 1 and kza = 0.1. The red diamonds are the solutions originally associated with the ions when there is no coupling, while the blue crosses are the solutions for neutrals. The solid line is the analytical approximation given by Eq. (30). In b) the shaded area denotes the region of instability.
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