The photographer Contact info View guestbook Sign guestbook Guest photo gallery Links Home . The supralateral arc is the 46 deg. It is caused by refraction of light by pencil-shaped horizontally oriented ice crystals.
Light enters one of the side faces of the pencil crystal, and exits via a vertical end face.
The supralateral arc is easily misinterpreted as being part of the 46 deg. Any doubts can be ruled out when taking into account other halos present, for example, when only circular halos are present, this is an indication that only randomly oriented ice crystals are present, and the 46 deg. All photos and video files on this site are copyright H.E. Edens, unless explicitly noted otherwise.