Fig. 1.
Model described by Verth et al. (2010). Waves generated at the foot-points s = 0 and s = 2L propagate in opposite directions and are damped by resonant absorption in the whole annulus region. In the region of interest (grey), if Pout(f) = Pin(f), waves in the inward direction (red) are more strongly damped than those in the outward direction (blue), as indicated by the coloured arrows.
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