Images refuting the myth that magnificent ice halo displays are only the stuff of Polar regions or at least very cold weather. These, over the tropical rainforests of Peru were in high and icy cold cirrus cloud which occurs anywhere on the planet.



The sun was ~72° high and the halos therefore differ from their more familiar temperate climate aspect. The sharply coloured ring around the sun is a circumscribed halo generated by column crystals drifting with their long axes almost horizontal. At high sun the halo is nearly circular but there are traces of the truly circular 22° halo (from randomly oriented crystals) within it.



The smaller white ring through the sun is a diminutive version of the normally huge parhelic circle. It is formed by column and plate shaped crystals. A rarity is the Wegener arc looping through the parhelic circle. Not often so bright or extensive. More halos were beneath the sun. Scroll down for these and the labelled HaloSim computer ray tracing.

