The formation of sunset glow is due to the scattering of light by air. When sunlight enters the atmosphere, it is scattered when it encounters atmospheric molecules and particles suspended in the atmosphere. These atmospheric molecules and particles themselves do not emit light, but because they scatter sunlight, each atmospheric molecule forms a scattered light source.

According to Rayleigh's law of scattering, light in the solar spectrum with shorter wavelengths such as purple, blue, and cyan is the easiest to scatter, while light with longer wavelengths such as red, orange, and yellow is transmitted Very capable. Therefore, we see that the clear sky is always blue, and the light above the horizon is only yellow, orange, and red light with longer wavelengths. After these rays are scattered by impurities such as air molecules and water vapor, the sky there takes on brilliant colors. Huoshaoyun is the red cloud that appears at sunrise or sunset. Sunset clouds are mostly caused by light cumulus clouds. Light cumulus clouds do not cause precipitation, and generally indicate that the weather will continue to be sunny in a certain range in the next few days, which is conducive to travel. ?

Huoshao clouds are low clouds and are one of the phenomena of atmospheric changes. It often appears in the summer, especially around sunset after a thunderstorm, in the western part of the sky. Due to the strong evaporation on the ground, the updraft in the atmosphere has a greater effect, making the shape of the fire cloud ever-changing. The color of Huoshaoyun is generally bright red. The appearance of fire clouds heralds the coming of a period of warm weather, abundant rainfall, and luxuriant biological growth.

The bright red alpenglow appears before and after sunrise, indicating that there is a lot of water vapor in the atmosphere, and clouds have begun to invade the area from the west, indicating that the weather is about to turn rainy. Colorful clouds. A light phenomenon similar to a rainbow that occurs in the morning and evening. It is not as regular as a rainbow, but as random as spilled paint. It's like an abstract painting, with a hazy beauty. Generally called "Zhaoxia" in the morning, the clouds themselves are dim in color and huge in shape, but the sky shows an elegant rose color. ?