Fig. 1.

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Selected images of the normal component of the photospheric magnetic field of AR11890 taken by the HMI during the interval studied in this paper. The green arrow marks the area where intense magnetic flux decay occurred, while the blue arrow shows the location of the parasitic positive polarity at a later stage during the flux decay episode. The field of view of each panel is 571″ × 387″. The associated movie is available online.
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