The existence of hexagonal, pencil-shaped ice crystals that fall with their long axes horizontal is well established. We have used a computer simulation technique to examine the consequences of five mechanisms suggested in the literature to explain the origins of anthelic arcs. The results show that pencil crystals with horizontal axes may be responsible for the anthelic arcs, the anthelic pillar, and the anthelion.
© 1979 Optical Society of America
A. James Mallmann and Robert G. Greenler, "Origins of anthelic arcs, the anthelic pillar, and the anthelion," J. Opt. Soc. Am. 69, 1107-1112 (1979)