AIA/SDO extreme UV images and HMI/SDO magnetogram. Panels (a)–g)) display the loops as seen in Fe XVIII a), AIA 94 Å b), 335 Å c), 211 Å d), 193 Å e), 171 Å f), and 131 Å g). Panel h) shows the line-of-sight magnetogram. The Fe XVIII image is derived from the AIA images. (see Eq. (1)). The arrows point to the two loops investigated here. Each of the images (a)–g)) is shown when the loops become clearly visible in the respective band. The blue circles mark the footpoints of the loops, and the blue rectangles in (a)–g)) the regions for the lightcurves of the Loop 1, as shown in Figs. 2 and 5. The white rectangles NS in (a), c)–g)) indicate the positions for the time-space diagrams displayed in Fig. 3. The red rectangle EW in a), the red line EW in f), and the black rectangles EW in (c)–g)) show the positions for space-time diagrams displayed in Figs. 4a, b, and 7, respectively. E, W, N, and S separately denote the heliographic directions. The field of view (FOV) is 150″× 60″. (An animation of this figure is available online.)