a) HMI line-of-sight magnetogram with the FOVs of the CRISP and IRIS observations overplotted in black and white rectangles, respectively. b) A sample of the cotemporal CRISP FOV Hα −0.77 Å image. The overplotted white solid and dashed rectangles in panel b indicate the ROI (i.e., the FOV of Figs. 2–4a and Cols. 1–3 of Fig. 6) and a neighboring typical quiet Sun region considered in determining the average Hα line reference profile, respectively.