What is the phenomenon of white sun?

The phenomenon of white sun in the sky is called solar halo. According to meteorologists, solar halo is an atmospheric optical phenomenon, which is formed by the refraction or reflection of ice crystals when sunlight passes through cirrostratus.

When light enters the ice crystals in cirrostratus, it is refracted twice and dispersed into light of various colors in different directions. When there is cirrostratus, there are countless ice crystals floating in the sky. Ice crystals in the same circle around the sun can refract the same color light into our eyes, forming a halo of internal infrared violet.

When there is a cirrostratus composed of ice crystals in the sky, one or more colored rings with the sun as the center and infrared violet inside often appear around the sun, and sometimes there are many colored or white spots and arcs, which are collectively called halos.

A harbinger of solar halo

The appearance of solar halo often indicates that the weather may change in a short time, but it is not absolute. There are small ice crystals in the sky, and sunlight will be refracted to form a solar halo. The formation of small ice crystals is because the rain in the sky meets low temperature, so there is a solar halo, which indicates that there is rain in the sky, so the solar halo has certain reference significance for weather changes.

Folk say that the sun is dizzy and it rains in the middle of the night, and the moon is dizzy at noon, and the sun is dizzy and the moon is dizzy again, which can be regarded as a precursor to the weather change, meaning that if there is a solar halo phenomenon, it may rain in the middle of the night, so the appearance of solar halo indicates that it may turn cloudy or rainy. If there is a halo, it means there may be wind at noon the next day. The ancients discovered this law long ago, so there is a proverb that it rains in the middle of the night when the sun is dizzy, and it is windy at noon when the moon is dizzy.