Fig. 4

Dependence of the period of trapped sausage oscillations on the steepness index, α, for different wave numbers: kx = 0.4 shown by the solid line, kx = 0.7 shown by the dotted line, and kx = 1.4 by the dashed line. The solid line stops where the oscillation becomes too leaky to accurately measure the period. For all the curves, the value of the parameter δ was fixed as 0.8. The period is measured in normalised units, equal to d/CA∞, where d is the slab half-width and CA∞ is the Alfvén speed outside the slab.
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