Fig. 4
Time sequences of the propagation of a wave launched at position iii) of Fig. 1. Time increases from top to bottom. Left column: perturbation of the absolute velocity, δ|v|. Right column: perturbation of the pressure, δ|p|/p0. Note that different time steps apply to each column. The green contours (thin white in the print edition) display the equipartition level, cs = cA. The arrows in the right column indicate the direction of the magnetic field lines, along which the slow acoustic mode escapes the atmosphere. The black curves in the left column indicate the position of a single wave front and its evolution with time. δ|v|(t) is available as an mpeg animation in the online edition of the article.
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