Posted: Jun 6, 2013 3:34 PM by Meteorologist Mike Heard
Updated: Jun 6, 2013 3:42 PM
BUTTE - A sun halo could be seen over Butte this afternoon and Teri Kippen took the attached picture and emailed the photo to us at email@example.com.
A sun halo is a ring around the sun caused by sunlight passing through millions of tiny ice crystals from the high cirrus clouds above 20,000 feet within the Earth's atmosphere.
The crystals refract and reflect the sunlight projecting it elsewhere into the sky and if you are at just the right angle, 22 degree angle, a halo appears.
This phenomena can also occur around a full moon. This is a similar phenomena with rainbows, light reflecting through tiny water particles when the sun is at a low angle in the sky.