SDO/AIA 171 Å averaged and normalized flux and SDO/HMI line-of-sight magnetic flux. a) Blue stars indicate the 171 Å flux in the jet region divided by the number of pixels in the box (larger solid box as shown in Figs. 1a–c) normalized to the background flux, which is computed in the dashed box shown in Fig. 1. Plus signs represent the averaged background flux per pixel. The temporal resolution is about 2 min. The two vertical lines mark the time range for 171 Å flux as shown in the bottom panel. b) The temporal resolution for the 171 Å flux is about 12 s. The three vertical lines mark the peak times of the 171 Å flux. Dash-dotted, dotted, and solid lines indicate positive, unsigned negative, and total unsigned line-of-sight magnetic flux, respectively.