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Sun halo as seen on May 14, 2013

This image of a sun halo was captured by Steve Scanlon on May 14, 2013 in Tinton Falls, New Jersey.

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.