Profiles of the equilibrium quantities with cA(0) = 0.8, u0(0) = 0.7 and u0(L) = 0.2 for a vertical flux tube are shown with different linestyles in the upper panel. The flow speed is constant when s > L. Speed and distance are normalised with respect to cs and L, respectively. The plotted equilibrium profiles are for a fixed scale height of λ = 2.5. The middle and lower panels show the variation of the corresponding real and imaginary parts of the eigenmode frequencies with respect to the scale height λ. The three dot dashed, solid, dotted, dashed and dot-dashed lines represent the first, second, third, fourth and fifth modes.
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