Corona and Iridescence
July 09, 2003
The beautiful corona above was taken on June 22, 2003 over Halifax, Nova Scotia. In addition to this corona, iridescence or irisation can be observed in the clouds further away from the Sun. In essence, iridescent clouds are detached corona and are similarly caused by diffraction of sunlight. The metallic like hues of these clouds are indicative of overlapping orders of colors. See also yesterday's Earth Science Picture of the Day.