The 46 degrees Halo and Its Arcs

Details The 46 degrees Halo and Its Arcs The 46 degrees Halo and Its Arcs

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979sci...206..643g&link_type=abstract

Science, Volume 206, Issue 4419, pp. 643-649

Computer Science

2

Scientific paper

Ice crystals in the form of right hexagonal prisms have faces that form 90 degrees prisms. Light rays were traced through these prism faces by computer calculation, and the light patterns that would be produced in the sky for a particular distribution of crystal orientations were simulated. Crystals with random orientations produce a 46 degrees halo. Hexagonal plate crystals with nearly horizontal end faces produce circumzenithal and circumhorizontal arcs. Hexagonal column crystals with horizontal axes produce supralateral and infralateral arcs. Plate crystals spinning about a horizontal axis that is a face diagonal of the crystal produce a series of arcs touching the 46 degrees halo. Each of these effects was simulated for several elevations of the sun.

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