A rare “winter rainbow” was seen in the Moscow region
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Residents of the Moscow region saw a halo effect in the sky, also known as a “winter rainbow”
Residents of the Moscow region observed an optical phenomenon known as the halo effect and sometimes also called the “winter rainbow” or “three suns.”
During frosts, cirrus clouds with ice particles form in the high layers of the troposphere, in which sunlight is refracted. As a result, a mesmerizing circle of light can be observed around the star from the ground, which is called a “halo”.
This optical phenomenon is most often seen around the Sun, although it can also be created by moonlight, and sometimes around street lamps, although it appears differently in this case. A halo formed by sunlight sometimes resembles a rainbow as the light reflected and refracted by ice crystals is split into a spectrum. Most often, a halo appears as a 22-degree circle with colors ranging from red to yellow, but sometimes it appears in other forms, including an “inverted rainbow” and a blurry white spot in front of the star.
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