Circumhorizon arc and 22 degree halo
Taken by Martin Viala on June 26, 2018 @
Ottawa, Ontario, Canada
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Details:
The sky was very bright and hazy that day. As usual when I go outside I took a quick look around the sun to see if there was any interesting atmospheric optic phenomenon. I quickly identified a 22 degree halo around the sun, and my attention got caught by this coloured horizontal arc sitting below. I identified it as a circumhorizon arc. However the absence of other arcs related to plate oriented ice crystals (sundogs, parhelic circle, etc.) made me think it could also be a rare infralateral arc. The Halosim software simulation of the display was not very conclusive to differentiate the two halo due to their resemblance and the buildings obstructing the view.
At first the arc was not very saturated in colour. As time went on it became brighter, I then took a picture at 12:33 when the sun was at 67.2 degree elevation. It was quite a rare, interesting sight.
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