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Fig. 2


Top: HMI magnetogram of the active region 11283 before the flare, taken at 22:00 UT, showing a leading bipole made of a small strong positive polarity and more extended negative polarity and a trailing faculae region of positive polarity. Bottom: map of the same field of view, obtained at the same time, of the vertical component of the current density, Jz, with the noise level removed. The leading strong bipole shown in the magnetogram corresponds to the location of the strongest current. The square indicates the field of view where the evolution of the currents and QSLs are investigated in more detail (see Fig. 3).

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