Other halo phenomena

(Section 3.2.3.1.11)

A number of other halo phenomena can be seen on rare occasions. These include: the Parry arc, anthelic arcs (diffuse, Wegener, Hastings, Tricker), tape arcs (or 46° Parry arcs), helic arc, subhelic arc, Moilanen arc, haloes on pyramidal ice crystals (for example, with radii of 9°, 18°, 20°, 23°, 24°, 35°) and likewise a number of tangential and parroid arcs, elliptical haloes, etc.