Irisation

Irisation forms by light diffracting around waterdrops in clouds and interfering with itself. It is indeed the larger version of corona, but often fragmental.

Irisation 2005/2/15

2005/2/15 15:47 EST. Cloud irisation with metalic color. From Green Tree, Pittsburgh. Nikon coolpix 995 camera.

Irisation 2004/11/13

2004/11/13 This photo was taken in Mount St. Helens monument, Washington, at an elevation of 3000 ft. The cloud was rapidly evaporating. Two rings are visible.

Irisation 2003/2/15

2003/2/15 15:13 PST. An iridescent cloud above the sun (which itself is visible in the darker cloud). Nikon coolpix 995 digital camera, underexposed. Death Valley, CA.