Solstice 22°halo with a Pollen Corona inside?
Taken by Mike LeFevre on June 21, 2019 @ Clinton, Wisconsin
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  Camera Used: Apple iPhone 7
Exposure Time: 1/100000
Aperture: f/1.8
ISO: 32
Date Taken: 2019:06:21 13:05:50
  
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Details:
It was just after noon on the summer solstice, so the sun was about as high as we will see it in southern Wisconsin. There was a 22°halo, with an embedded smaller halo. I thought that maybe it was a pollen corona, but I didn't see any color, so, I'm not sure if that is what I saw. I took pictures with an iphone 7 with the exposure lowered slightly.
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That is not a pollen corona indeed, since such corona is much smaller and vividly coloured. The inner halo is a halo too but with a small radius of 9 degrees, less than half of that of the outer, common halo of 22 degrees. That small-radius halo has its origin in ice crystals with unusual refracting angles. The small halo should be slightly coloured too since it is caused by refracting, but often the colours are too faint to distinguish.
Posted by pphv 2019-06-22 01:44:42
 
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