Effects of field line expansion on Alfvén waves and vortices

Open Access

Fig. 2.

Equilibrium parameters in the atmosphere. The panels on the left display the variation of density, Alfvén speed and magnetic field. The panels on the right show the radial distance, r = r(s), and the corresponding parameters that determine the cut-off frequencies Ω₁ and Ω₂. Logarithmic scales are used.

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