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Fig. 4

image

Temporal evolution of the area (left) and magnetic flux (right) in active region NOAA 12118 during its disk passage. The solid and dash-dotted lines in the left panel show the photometric and magnetic area, respectively. The solid, dash-dotted, and dashed lines in the right panel correspond to the total, positive, and negative magnetic flux, respectively. The four vertical lines indicate the time of the BIC time-series. The labels a to d indicate different stages of active region evolution, which are explained in Sect. 3.2.

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