Faceted snow crystals
1987; Optica Publishing Group; Volume: 4; Issue: 3 Linguagem: Inglês
10.1364/josaa.4.000581
ISSN1520-8532
Autores Tópico(s)Cryospheric studies and observations
ResumoColored halos are produced by refraction of light by solid hexagonal snow crystals with well-defined facets whose size is sufficiently large (>20 μm) to avoid significant diffraction effects. Large crystals fall with their major axes horizontal and oscillate by eddy shedding to give dogs and arcs. The formation of such crystals is strongly dependent on changing growth conditions, particularly ice supersaturation, air pressure, temperature, and the thermal radiation environment. Optimum meteorological conditions for formation of such crystals are suggested.
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