First, I learn about sundogs which appear @ 22 degrees above the horizon, which I do see from to time, though for all the years that I have been aiming my face towards the sky it's only been the last 4 or 5 years that I have seen these appear.
Circumhorizon arc, as reported on SpaceWeather.com, are also called summer arc's and fire rainbows, "appear only when the sun is more than 58-degrees above the horizon--in short, during the hottest part of long summer days." My photo was taken June 28th and I think we hit 75-80 that day in Appleton.
Not to be confused with Circumzenithal arcs which appear @32 degrees above the horizon. From what I can see the zenithal is an an actual arc, but the horizon is more smudgy. Check out the different photos from spaceweather site; simply gorgeous.This source shows what the difference is between the two types, plus what is and is not a rainbow.
3 comments:
Great post! I've come to look forward to your updates. Cheers!
I'm glad you like my photo, but please give my website credit if you would like to use this picture. Thank you.
Paul
http://cometman.com/Arcs/Circumhorizon-Arcs.html
just to follow up, I had updated the links to properly reflect paul's site. My memory fails me, but the photo I think was from the spaceweather site. I always try to cite original source, so this was a little embarrassing.
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