AR NOAA 2975 observed on 2022 April 2 by HRI_EUV near the northeast limb. Top: The solid white rectangle shows a twisted coronal loop where hints of torsional Alfvén waves may be observed. Bottom panels: Snapshots over 30 min evolution of the loop observed in the field of view corresponding to the white rectangle where a change in orientation of the twisted EUV strands can be seen (see Sect. 3.1.6)