High above the sun and the glowing halo that encircles it, a rainbow.
I'm not sure what this is in technical terms, but Atmospheric Optics mentions phenomena such as supralateral arcs, which I think would be about the same distance from the sun and solar halo as this.
Some of my images show this upper rainbow curving down; in some it's straight across; here, it curves slightly up -- a very subtle smile. (All photos: Regina, Saskatchewan, Canada.)
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| The mystery upper rainbow: a subtle smile. Photo © SB |
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Update: Les Cowley of Atmostpheric Optics has confirmed this is part of a circumzenithal arc. I'm excited about capturing the picture -- and about having seen it in the sky.
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