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Sun halo as seen on April 26, 2013

This image of a sun halo was captured by Bob Clark on April 26, 2013 in Lynnwood, Washington.

Solar halos

The phenomenon of seeing a ring around the sun, known as a solar halo, is caused by the presence of high cirrus clouds above your head, meaning they take place in the lower atmosphere and have nothing to do with the sun's activity, EarthSky says.