Have you ever seen a Sundog? Here's why they form:
I am constantly scanning the sky. It’s just what I do. On my commute home from the University of Georgia yesterday, I saw something that always excites me. I quickly grabbed my phone, rolled down the window, and snapped the picture below. It is a Sundog. Sundogs have special meaning to me because I think they are very high on the “scientifically cool” index.
Sundogs form when light is refracted because of ice crystals in the sky. Though my picture above only shows one of them, there are often two of them . They are typically located 22 degrees to the right and/or left of the sun depending on how the ice crystals are distributed. The colors transition from red to blue . Sundogs are often called “mock suns.”Halos are rings of light that form around the moon or sun as light is refracted in ice crystals associated with a veil of cirrus-type clouds.
Sun dogs occur when the Sun or Moon shines through a thin cirrus cloud composed of hexagonal ice crystals falling with their principal axes vertical, as opposed to the halo phenomenon that occurs when the principal axes are randomly arranged in a plane perpendicular to the Sun’s or Moon’s rays. The red end of the spectrum, being bent the least, appears on the inside, with the blue, when visible, appearing on the outside. Sun dogs most commonly appear during the winter in the middle latitudes.
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