Contour plots showing the variation of ω′ with respect to the internal background flow speed, ui, and the ionisation degree μ. Red indicates a positive value of ω′ (amplification) and blue indicates a negative value of ω′ (damping). The colour bar shows the numerical value of ω′ and the contour labelled ω′ = 0 indicates the transition between amplification and damping of the wave. Panels a and b both use the parameters ρr = 0.01, kz0 = 0.1, and k = 2 × 10−7 m−1 but with ν = 109 m2 s−1 and ν = 1010 m2 s−1 respectively. In the panels c and d we used ρr = 0.02, kz0 = 0.2 and k = 4 × 10−7 m−1 along with ν = 109 m2 s−1 and ν = 1010 m2 s−1, respectively.
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