Fig. 3.
Time sequence of prominence PA in GONG Hα images, AIA 171 Å images in log scale, and Gaussian smoothed HMI LOS magnetograms on May 20 (a–c), May 21 (d–f), May 22 (g–i), and May 23 (j–l) in 2012. The small circles in different colors show the location of the footpoints of the prominence legs. The diameter of these circles is 8 arcsec (about 5800 km). The magnetograms are shown in gray saturated at ±30 G. Supergranular boundaries are indicated by dashed lines in different colors connecting strong magnetic elements in the HMI magnetograms.
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