Extended Data Fig. 5: Formation of strands.

a–d, Five moments during the expansion period of the loop are selected that show the global evolution of the structure in the IRIS 1,400 Å channel (a) and AIA 171 Å channel (b), together with the corresponding running difference images in c and d. The cuts for the nanojets ‘N1’ to ‘N13’ are overlaid in groups, according to their time of occurrence. See Extended Data Fig. 6 for a more precise time location of these nanojets during the evolution. Note the formation of very fine and long coronal strands that originate from the nanojets.