Images of the observed region. a, b, c: context SDO/AIA images. d: SDO/HMI magnetogram. The blue rectangle indicates the 55″ × 51″ FOV of the submagnetogram below. e: SDO/HMI submagnetogram rotated to match the MiHI image frame where the origin is located in the lower left corner of the 9.2″ × 8.2″ MiHI FOV (red rectangle). The colored curves denote the projected magnetic field lines of the constructed potential field configuration with color representing height above the surface. f: MiHI Hα intensity image with the projected field lines superimposed. Most of these field lines inside the MiHI FOV have heights of < 4000 km.