Time-distance plots of transverse flows in sausage oscillations. Left panel: example of a trapped sausage oscillation in a plasma slab with the parameters: δ = 0.8 and α = 6 for the wave number kx = 1.5. Right panel: example of a leaky sausage oscillation in a plasma slab with the parameters: δ = 0.7 and α = 6, for kx = 0.4. The spatial coordinate is normalised such that the half-width of the slab, d = 1, and the time is measured in the units d/CA∞, where d is the slab half-width and CA∞ is the Alfvén speed outside the slab.
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