Left: Jz-maps of the zoomed portion of the active region (see Fig. 2) two times before (22:00 and 22:12 UT) and after (22:24 and 22:35 UT) the flare in the solar local coordinates. Right: base-difference of the direct current density, where the base is taken at 21:36 UT, the red (resp. blue) color showing an increase (resp. decrease) in the density. The four boxes indicate the regions where most of the changes before and after the flare are seen and where the electric current is integrated. Two boxes (1 and 2) are chosen in the positive magnetic polarity, while two others (3 and 4) are chosen in the negative magnetic polarity to point to the most important changes during the flare evolution.
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