Panels a)−c): AIA 131 Å images displaying a fan-spine structure on 18 November 2013. Panels d)−f): corresponding AIA 171 Å and 304 Å images and HMI LOS magnetogram. In panel f), the black squares denote the positive magnetic field regions where this flux rope proxy’s northwest ends are rooted, while the white square denotes the negative field region at the other end and they are also shown in panel c). Panel g): total positive magnetic flux (blue curve) and brightness (red curve) of the region shown by the white square in panel f) from 16 November 00:00 UT to 20 November 00:00 UT. The orange region marks the start of the magnetic field’s emergence, while the green and blue regions denote the brightening events of the structure. An animation (6.mp4) of the 131 Å, 171 Å, and 304 Å images is available online.
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