For a time, there were different opinions. This incident quickly triggered a heated discussion on social media and rushed to hot search.
Is the legendary UFO coming?
Sorry, I was on duty yesterday. I accidentally typed the wrong code, and there was a bug in the world
This is the red background of Altman's transformation when he was a child
……
Netizens have launched their rich imagination. But what the hell is going on? Why does the sky show different colors? How did the sunset glow come from? I'll take you to understand these problems today.
Why does the sky show different colors?
Many light phenomena in the atmosphere, such as orange red in the morning and evening clouds, blue in the sky and white in the clouds, are caused by the reflection, refraction and scattering of light after entering the atmosphere. The change of sky color is closely related to two physical principles, namely Rayleigh scattering and meter scattering.
Rayleigh scattering, also known as "molecular scattering", was discovered by British physicist Rayleigh in 1900. The particle size is much smaller than the wavelength of incident light, and the scattered light intensity in each direction is different.
Meter scattering, also known as "coarse particle scattering" and "large particle scattering", was first proposed by German physicist Gustav meter in 1908. When the particle size is close to or greater than the wavelength of the incident light, the scattered light intensity is asymmetric in all directions, and most of the incident light is scattered along the forward direction.
It can be seen that the particle sizes faced by the two kinds of scattering are different. Rayleigh scattering is molecular level, while meter scattering is "coarse particle" and "large particle".
What's the matter with the red light in Zhoushan?
According to Zhoushan media reports, the red light in Zhoushan is related to an ocean going ship fishing northern Pacific saury docked at the wharf of zhouyu company at that time. The red light is the light of the ship.
So why does this red light make the sky red?
On the evening of May 7, there were many clouds in Zhoushan, with heavy fog and even drizzle in some places. The air was full of water droplets, fog droplets and aerosols. When the red light emitted by the fishing boat irradiated these "large particles", meter scattering occurred. Because the wavelength and particle diameter of the red light were just the same, the red light scattered and refracted many times in the atmosphere, and because the scattered light intensity was asymmetric in all directions, The whole sky was filled with red light.
Is the sky full of red light common in Zhoushan?
This phenomenon is not common. As mentioned above, the meteorological conditions are the necessary conditions for the red light phenomenon in the sky, and there are often no such suitable meteorological conditions. In other words, it is a rare coincidence that the diameter of "large particles" in the atmosphere is equal to the wavelength of red light.
What's the matter with the red sky of dawn and sunset?
Xia is divided into morning glow and sunset glow. It is generated when sunlight passes through the thick atmosphere and is scattered by a large number of air molecules. The more impurities such as dust and water vapor in the air, the more obvious the color is.
When there is no cloud cover, the sun shines directly on the ground. Sunlight consists of ultraviolet, infrared and visible light, accounting for 5%, 43% and 52% respectively. Visible light is divided into seven kinds of light: red, orange, yellow, green, green, blue and purple, with wavelengths ranging from large to small.
After sunlight enters the atmosphere, it will encounter clouds, where there are "large particles" such as water droplets and aerosols, and meter scattering will occur. The light of green, blue and purple with short wavelength in the solar spectrum is most likely to be scattered by "large particles", while the light of red, orange and yellow with long wavelength has strong light transmission ability, and will be scattered in the clouds. At this time, we can see the orange red of the morning and evening glow.
The morning glow and sunset glow are not a single orange red. Due to the different diameters of water droplets and raindrops in the clouds, the glow will show red, orange, orange red, yellow, pink and other colors.