WLF in NOAA AR 11515. Panels a, b, and c are AIA 1600, 171, and 131 Å images at the peak time of this WLF, respectively. Panels d and e are HMI continuum images at the beginning and peaktime of this WLF, respectively. Panel f is the difference image between (d) and (e). Panels g and h are HMI line-of-sight magnetograms at the beginning and peak time of this WLF, respectively. Panel i is the difference image between (g) and (h). The white box in panel a corresponds to the FOV in panels d–i. The green box in panels d–i marks the location where the flare occurred.