Time sequence of continuum images from SDO/HMI. The time and date of the observations are indicated in the top left corner, while the position of the active region on the solar disc is shown in the bottom left corner of each panel. The arrow in the lower right corner of each panel points to disc centre. Solar east and north are to the left and top, respectively. Leading sunspot – LS, the satellite group of sunspots – SS, and a region of mixed polarity – MP. The panel number is indicated on the top right corner.
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