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Astro Bob

Coney Dogs Meet Sun Dogs In A Fantastic Halo Display

31 Oct 2019, 16:53 UTC
Coney Dogs Meet Sun Dogs In A Fantastic Halo Display
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A relatively rare 120° parhelion glows within the parhelic circle over downtown Duluth, Minn. earlier this week. Both form when sunlight passes in different ways through minute ice crystals in hazy high clouds called cirrostratus. Any time you see bright sun dogs (described below), turn around and look for the parhelic circle and the 120° parhelia. Bob King
We had just finished our coney dogs at a local restaurant and were talking in the parking lot. I happened to look up, something I happen to do a lot. Hazy clouds smeared the sun into a brilliant, featureless glow accompanied by a pair of bright sun dogs two fists to either side. Sun dogs or mock suns aren’t too unusual and often accompany a big ring around the sun called a halo. They’re caused by sunlight streaming through tiny, six-sided plate-like ice crystals floating with their broad sides parallel to the ground. A sunbeam enters one side of a crystal, gets bent or refracted, and exits the opposite side at a 60° angle.
Two sun dogs shine on either side of the sun on Tuesday afternoon Oct. 26. A faint halo is also visible topped by a bright upper tangent arc ...

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