Coordinated observations of EUI and PHI of the first case observed on 2022 March 4. (a) Zoomed-in EUI 174 Å image taken at 10:50:30 on 2022 March 4. (b) Space-time diagram of the running difference images in EUI 174 Å passband along the slit shown in (a). The speeds are estimated through the slope of the blue lines. (c–d) Magnetograms saturated at ±350 G taken by PHI at 10:48:10 and 11:03:10 UT, respectively. The blue arrows point out the location of flux emergence and cancellation.