Fig. 5.

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Contour plots of Re(P) = 0 for Alfvén waves as a function of the wavenumber with (A)βe = 0.01 and (B)βe = 0.10; and as a function of the plasma beta parameter with (C)ck/ωpp = 0.5 and (D)ck/ωpp = 1.0. The solutions for the different oxygen ion concentrations considered are displayed in different colors. Above each curve, the solution is right-hand polarized (KAW) for a specific oxygen ion concentration, while below it is left-hand polarized (EMIC).
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