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An Atlas of Refraction Halos

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Abstract

We will introduce a natural halo parameter Sw that leads to the classification of all halos due to refraction in preferentially oriented ice crystals. We are motivated by a desire to understand the many exotic halos that could conceivably arise in pyramidal crystals or in spinning crystals. Given sufficient space, we would first construct an atlas of all possible (refraction) halos, making no assumptions about real crystal shapes and only a minimal assumption about real crystal orientations. We would then show how real halos, or at least plausible halos, with their specific crystal shapes and orientations, fit into the atlas. In fact, however, in the space allotted we can only present two pages of the atlas and indicate the locations of a few more or less familiar halos.

© 1997 Optical Society of America

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