Snapshots of the development of a slow magnetoacoustic pulse excited at the footpoint of a magnetic arcade for β = 0.3. The x component of velocity Vx is shown at times t = 7.5 s (top left panel), t = 15 s, (top right panel), t = 22.5 s, (bottom left panel) and t = 30 s (bottom right panel). To excite the slow wave, we used the same parameters for the initial pulse as in Fig. 2.
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