«Winter Rainbow». A halo effect appeared in the sky above Moscow

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MOSCOW, January 2 An optical phenomenon around the Sun, called the halo effect, appeared on the afternoon of January 2 in the sky over the Moscow region, where the thermometer reading dropped to minus 19 degrees, the correspondent reports.
The halo effect, also called the “three suns,” is a secondary glow around the sun, usually in the shape of a circle or arc. Scientists distinguish between different types of such glows, but they are all caused by ice crystals in cirrus clouds in the upper troposphere at an altitude of five to ten kilometers.
The light reflected and refracted by ice crystals is often decomposed into a spectrum, which makes the halo look like a rainbow.