Published in Appl. Opt. 54 B177-B184 in 2015
G.P. Können
The radiance
distribution of light scattered by randomly oriented ice crystals differs
fundamentally from the radiance distribution of light scattered by spherical
raindrops or by preferentially oriented ice crystals. A formalism for light
scattering by randomly oriented crystals is given and applied to four examples,
among them the circular 22° halo and the antisolar halospot, the latter being
the glory analogue for ice crystals. A long-standing misconception about the
nature of the radiance distribution of circular halos is quantified and
discussed.