Associations with the photospheric magnetic field. Panel a presents the x-t map from S${}_{171}^2$, while panel b shows a subsection of the AIA 171 Å image that encompasses the loop system studied in this paper. The cyan and red contours overlaid on panel b represent boundaries of ±20 G, derived from the co-temporal HMI LOS magnetogram. The white rectangle in panel b outlines a sub-FOV that contains the west-side footpoint region of the loop system. The six side panels next to panel b display snapshots of the sub-FOV at six different times, labeled t1–t6. These six timestamps are highlighted with dash-dot vertical lines on the x-t map in panel a. The white arrows in panels t1–t6 mark the loop of interest. The back-and-forth movement of the loop footpoint is better visualized in the animation available online.