Home » Zhoushan sky turns blood red? Is it a sunset or a “vision in the sky”? The truth is… – Scientific Exploration – cnBeta.COM

Zhoushan sky turns blood red? Is it a sunset or a “vision in the sky”? The truth is… – Scientific Exploration – cnBeta.COM

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Zhoushan sky turns blood red? Is it a sunset or a “vision in the sky”? The truth is… – Scientific Exploration – cnBeta.COM

I believe that many people have been swiped by several groups of “hot” pictures and videos in the past two days. At around 8:00 p.m. on May 7, many netizens photographed the magical scene of red light in the sky in Zhoushan, Zhejiang.

For a time, there were different opinions, and the incident quickly caused heated discussions on social media and rushed to the hot search.

Is the legendary UFO coming?

Sorry, I was on duty yesterday, and I accidentally typed the wrong code, and there was a bug in this world

This is the red background of the Ultraman transformation when I was a child

……

Netizens have unleashed their rich imaginations. But what exactly is going on here? Why does the sky appear different colors? How did the sunset come about? Today I will take you to understand these questions.

Why does the sky appear different colors?

Many light phenomena in the atmosphere, such as the morning glow and sunset glow appearing orange-red, such as the sky is blue, and the clouds are white, etc., are caused by the reflection, refraction, and scattering of light after entering the atmosphere. And the change of sky color has a lot to do with 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 the incident light, and the scattered light intensity is different in each direction.

Mie scattering, also known as “coarse particle scattering” and “large particle scattering”, was first proposed by German physicist Gustav M in 1908. When the particle size is close to or larger 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.

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It can be seen that the particle sizes faced by the two types of scattering are different. Rayleigh scattering is at the molecular level, while Mie scattering is “coarse” and “large”.

What happened to the red light in the sky in Zhoushan?

According to Zhoushan media reports, the red light that appeared in Zhoushan was related to an ocean-going ship fishing for saury at the pier of Zhouyu Company at that time, and the red light was the light of the ship.

So why does this red light make the sky red too?

On the evening of May 7, there were many cloud systems 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 from fishing boats irradiated these “big particles” When the particles are scattered, meter scattering occurs. Since the wavelength of the red light is exactly the same as the particle diameter, the red light is scattered and refracted many times in the atmosphere, and because the scattered light intensity is asymmetric in all directions, the entire sky is filled with light. red light.

Is the red light in the sky in Zhoushan common?

This phenomenon is not common. As mentioned above, the meteorological conditions are the necessary conditions for the phenomenon of red light in the sky, but there are many times there is no such suitable meteorological conditions. That said, it’s a rare coincidence that the “big particles” in the atmosphere have a diameter comparable to the wavelength of red light.

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What’s up with the red sky at 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.

When there is no cloud cover, the sun hits the ground directly. Sunlight is composed of ultraviolet, infrared and visible light, accounting for 5%, 43%, and 52%, respectively. Visible light is divided into seven types of light: red, orange, yellow, green, cyan, blue, and purple, with wavelengths from large to small.

After the sunlight enters the atmosphere, it encounters clouds, and there are “large particles” such as water droplets and aerosols in the clouds, which will cause meter scattering. The light of green, blue, purple and other colors with shorter wavelengths in the solar spectrum is most likely to be “big particles”. The particles” scatter out, while the longer wavelengths of red, orange, yellow and other colors have strong transmittance and will scatter in the cloud. At this time, we saw the orange-red of the morning and sunset.

The morning glow and the sunset glow are not a single orange-red. Due to the different diameters of water droplets and raindrops in the clouds, the glow will appear in red, orange, orange-red, yellow, pink and other colors.

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