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Fig. 2

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Time sequences of the propagation of a wave launched at position (i) of Fig. 1a. The time increases from top to bottom. Left column: perturbation of the absolute velocity, δ|v|. Right column: perturbation of the absolute magnetic field, δ|B|. The green contours (thin white in the print edition) display the equipartition level, where cs = cA. The white curves indicate the position of a single wave front during its evolution in time. δ|v|(t) is available as an mpeg animation in the online edition of the article.

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