Temporal evolutions of HMI continuum and AIA 1600 Å intensities at two positions in WL enhancement regions. (a1) and (a2): HMI continuum light curves for the two WL positions, respectively. The dashed blue line indicates the background trend of the pixel. (b1) and (b2): HMI continuum light curves after removing the background, which exhibit a series of WL emission pulses. (c1) and (c2): AIA 1600 Å light curves at these two positions, respectively. The vertical grey line marks the peak time of the flare, and the vertical purple lines mark the beginning and end times of the 1600 Å impulsive emission in this pixel.