The reason why the sky is red at dusk

Question 1: Why is the sky yellow-red at dawn or dusk? In the morning and evening, colorful clouds often appear on the horizon around sunrise and sunset. The formation of morning glow and sunset glow is due to the scattering effect of air on light. 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 source of scattered light. 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 bright sky is always blue, and the light above the horizon is only yellow, orange, and red light with longer wavelengths. After these light rays are scattered by impurities such as air molecules and water vapor, the sky there takes on brilliant

colors.

As the saying goes, the morning glow will stay with you, but the sunset glow will travel a thousand miles. This means that the bright red glow in the morning means there are already a lot of water droplets in the atmosphere, indicating that the weather will turn rainy. If there is a fiery red or golden sunset glow, it means that there are no clouds in the west, and the sunlight can penetrate to form the sunset glow.

Therefore, it indicates that the weather will become sunny.

Question 2: What does it mean when the sky turns pink at dusk? At sunrise and dusk, the clouds on the horizon will appear red. This is because the seven-color light of the sun has different refractive index in the earth's atmosphere.

Purple, blue, and cyan light have a high refractive index and are refracted very close to each other, so people will not see it.

Red light has a small refractive index and can be refracted very far away, so clouds look red.

Common people call them "Huoshaoyun".

The colorful clouds at dusk are called "sunset glow", and the colorful clouds before sunrise are called "morning glow":

Question 3: Why is the sky pink? I once saw the sky turn pink in Zhanjiang. What happened?

Question 4: Why is the cloudless sky blue? Why does the sun appear red in the morning and dusk? Unknown question