a)–c) SDO/AIA EUV composite images. Each EUV image consists of three channels (red, blue, and green) in the 304 Å, 171 Å, and 211 Å channels, whose characteristic temperature corresponds to 0.05 MK, 0.6 MK, and 2 MK, respectively. The larger solid box marks the jet region where the 171 Å fluxes are integrated. The smaller solid box on the clock indicates the position and field of view of the EUV image on the solar disk. The dashed box indicates the region where the background flux for the 171 Å band is computed. d) SDO/HMI line-of-sight magnetic field. The black/white color represents the negative/positive polarity. The solid box marks the region of the footpoints of the jets, where the line-of-sight magnetic field flux is integrated. The dotted box marks the field of view for the analysis of the vector magnetic field.