Iridescent Wave Structure

        Image Index  Geir Oye (site) saw this iridescent wave cloud from Ørsta, Norway on January 30, 2006. The cloud structure was long lived but only iridescent when close to the sun. Wave clouds with their continously forming and evaporating droplets are good sources of iridescence because the droplets have similar histories and thus their sizes are similar in any one part of the cloud. Image ©Geir Oye, shown with permission.