Phase speed diagram of wave modes under photospheric conditions. We have taken cA,i = 2cs,i, cA,e = 0.5cs,i, and cs,e = 1.5cs,i. The Alfvén speeds are not indicated in the graph because no modes with real frequencies appear in that vicinity. The modes with phase speeds between cT,i and cs,i are body modes and the other modes are surface modes. Note that we only plotted two body modes, while there are infinitely many radial overtones.
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