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Fig. 4


Temporal evolution of a slow magneto-acoustic shock wave developed below the null point (see the movie provided in the online version). In order to follow the discontinuity, the directional derivative of the velocity along the field lines (in s-1) is shown. The locations of the transition region (TR), equipartition layer (EQ) and the null point (NP) are marked by vertical colored lines.

This figure is made of several images, please see below:

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