Unusual pyramidal ice in the atmosphere as the origin of elliptical halos

Mika Sillanpää*, Jarmo Moilanen, Marko Pekkola, Martti Penttinen, Jari Piikki

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

The formation mechanism of elliptical halos and Bottlinger's rings has long remained uncertain. The current model for elliptical halos requires multiple scattering from two different populations of ice crystals in a complex mode of motion. New evidence indicates that elliptical halos, and possibly Bottlinger's rings, are due to refraction through ice crystals shaped like obtuse pyramids. This unusual ice crystal may not have been documented previously.

Original languageEnglish
Pages (from-to)5089-5095
Number of pages7
JournalApplied Optics
Volume38
Issue number24
DOIs
Publication statusPublished - 20 Aug 1999
MoE publication typeA1 Journal article-refereed

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