Colorful Halo, Arc
Taken by Burney Baron on June 17, 2019 @ Penn Yan, NY
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  Camera Used: Canon Canon EOS 7D Mark II
Exposure Time: 1/500
Aperture: Unavailable
ISO: 200
Date Taken: 2019:06:18 00:26:34
  
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Details:
We had a sunny day with high wispy cirrus. The sun had a well defined and colorful 22 degree halo. A bright and colorful band appeared below the halo, somewhat diffuse but easy to see. I'm not sure if it was a segment of an arc associated with the halo, or a more local effect from a thin cloud. The band stayed in the same altitude for over a half hour, lengthening and shortening a bit over that period.
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That colorful band is another halo form which has its origin in another run of sunlite rays in the cloud ice crystals than of that 22degs halo. The 22degs halo is generated by 60degs refracting angles, and the colored band which is the so-called circumhorizontal arc, is generated by 90 degs refracting angles - and therefore is at larger distance from the sun. This arc can only be seen when sun is very high in the sky. Its more frequently seen opponent is called the circumzenithal arc which is high in the sky at the same distance from the sun as the circumhorizontal arc, and appears only when sun elevation is low.
Posted by pphv 2019-06-18 03:12:50
 
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