Ice analog halos

Crystals of sodium fluorosilicate are used to produce easy to set up visual displays of atmospheric halos, including the 22(degree) halo, the Parry arc, and upper tangent arcs. Scattering phase functions for single ice-analog rosettes, including a rough one, and a column aggregate, measured in randomized orientation, are also given. The phase functions show prominent halo features, with the exception of the rough crystal.