How did the colorful auspicious clouds come into being? What other strange clouds are there in nature?

Colorful auspicious clouds are a typical "Japan-China" situation. Under suitable weather conditions, sunlight is diffracted by small ice crystals and raindrops between clouds, and then separated by a solar spectrometer, thus producing colorful brilliance, generally ultraviolet red. In the part near the sun, the colors are purple and blue, and in the part far away from the sun, the colors are red and orange.

The occurrence standard of colorful auspicious clouds is different from the induction of rainbows and solar halos, and it is a weather phenomenon caused by sunlight diffraction. Therefore, the emergence of "colorful auspicious clouds" must also tolerate certain standards:

A thin part of the edge of a thin cloud or a large cloud; The key to the cloud is composed of symmetrical small ice crystals and small raindrops. Generally, the key is high cumulus clouds or low-lying cirrocumulus. Sunny, good visibility. Only when the clear gap is close to or very small to the wavelength of visible light can significant diffraction be observed.

Clouds in the sky belong to "cumulus clouds", which are the focal length of internal ultraviolet red produced by "diffraction" after sunlight irradiation, also known as "Hua". When sunlight flutters according to a thin cloud containing water droplets, the water droplets diffract light in different directions, and the diffracted light interferes with each other, so that bright light can be seen at the junction of light waves, and the light source at the junction is dim. Different polychromatic lights have different diffraction angles. The bright area of one polychromatic light is displayed in the dark area of another polychromatic light, and the color sequence is gradually generated. The farther away from the sun, the lighter the color. Because clouds are scattered in irregular blocks, they cause irregular blocks of bright clouds.

Most rainbows are in the shape of the ultimate circle, but because rainbows often appear in the area of 40-42 internal angle between people and the sun, it is difficult for people to see the lower part at dawn, and most of them are semi-arc. With the emergence of high-definition aerial photography technology, now everyone can see an extremely magnificent circular rainbow from the sky; In addition, standing on the top of the mountain with a wide view, you can also see a round rainbow, such as the "Buddha's light shining" in the Jinding of Emei Mountain. Despite the rainbow, "colorful clouds" have little to do with the "good luck" that everyone hopes. This situation at least shows that the meteorological elements of the natural environment are very good and the air index is good.