Sun Halo

27 April 2018
Astronomy

   … This image was taken by Harlan Thomas of Bowness of a concentric sun halo. This is Bowness in the US as he claims he was working in the yard (garden in the UK). This is an odd-radius sun halo and they are caused by ice crystals in the shape of pyramids. Sunlight passing through these unusual crystals create rings with radii of 9, 18, 20, 23, 24, and 35 degrees. At least 2 or 3 of these are present in Harlan's photograph – see wwww.spaceweather.com April 28th 2018.

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