UFO believers took a strong interest in this strange cloud formation when it appeared over Moscow in 2009.
But meteorologists identified the ring of light as an optical effect caused by sunlight hitting what is known as a hole punch cloud. These appear as a circular or oval hole in a thin layer of air containing supercooled water droplets. When a section of the layer is disturbed, such as by wind or a jet plane passing through it, the droplets can freeze instantly or evaporate, leaving behind a hole.
But meteorologists identified the ring of light as an optical effect caused by sunlight hitting what is known as a hole punch cloud. These appear as a circular or oval hole in a thin layer of air containing supercooled water droplets. When a section of the layer is disturbed, such as by wind or a jet plane passing through it, the droplets can freeze instantly or evaporate, leaving behind a hole.
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