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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 69, Iss. 8 — Aug. 1, 1979
  • pp: 1107–1112

Origins of anthelic arcs, the anthelic pillar, and the anthelion

A. James Mallmann and Robert G. Greenler  »View Author Affiliations

JOSA, Vol. 69, Issue 8, pp. 1107-1112 (1979)

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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)

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  1. R. G. Greenler and A. J. Mallmann, "Circumscribed Halos," Science 176, 128–131 (1972).
  2. R. G. Greenler, A. J. Mallmann, J. R. Mueller, and R. Romito, "Form and Origins of the Parry Arcs," Science 195, 360–367 (1977).
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  14. We used several methods of measuring the angles, working both directly from the 35mm slides and from enlarged projected images. In some cases we first sketched the arcs and drew tangent lines to the sketch; in others, we constructed tangent lines directly from the arcs in the photograph. We found that the reproducibility using any one method is better than the agreement between different methods. The number of ±5° on the measurements gives a reasonable indication of the uncertainty.
  15. Photograph from Rainbows, Halos, and Glories, to be published by Cambridge University Press.
  16. D. K. Lynch and Pt. Schwartz, "Formation of the anthelion," J. Opt. Soc. Am. 69, 383–386 (1979).

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