The sky becomes strange green, is it the end?

Written by Su Chengyu

Previously, a strong storm swept the city of Nanda, the United States, and the city of Susklez, the sky became strange doomsday green.

Many people take the "green" sky photos to the Internet. People who don't know think that the end is here.

Why is there a green sky?

The reason why the sky is color is because the sky is not completely "pure", and many tiny dust, ice crystals, and water droplets float in the air. Because of the existence of these "impurities", the sunlight penetrates the atmosphere and ejaculates to the ground, and it will be scattered by "impurities".

If the sky is clear, there are not many particles in the atmosphere (the wavelength of the gas molecular diameter is far less than the light, and the Ruili scattering appears), which is relatively pure, which is conducive to the scattered scatter of the short wave light. Therefore The atmosphere scattered and scattered on the background of the sky. Because the human eyes are not very sensitive to purple light, the sky looks blue.

If there is no atmosphere in the sky and no these "impurities", there will be no scattering. Then during the day, you can see the sun's background except that you can see the sun's sun.

Compared to common blue sky, green sky is much more rare. Of course, it was also caused by scattering, but at the time, the weather was before the storm came. The medium of scattering was different from the small impurities of the blue sky.

The droplets and ice grains in the storm are extremely dense, which is almost connected. Blu -ray and some green light, the light waves are relatively short, the penetration force is poor, and it is prone to scattering. At this time, the water drops and ice droplets in the storm are blue, as shown below:

And at this time, the sun must be just west, and the setting sun on the horizon is not blocked by the clouds. The yellow of the sunset, the blue of the water drops and the ice drops of the sunset make the sky look green.

"Green Sky" is naturally not a good sign. After all, there are a lot of water droplets and ice grains in it, which means that heavy rain or hail weather is coming.

This is reminiscent of the blood -red sky that appeared in Zhoushan in May this year. At about 8 pm on May 7, many people photographed the magical scene of the sky in Zhoushan, Zhejiang.

At that time, there were divergent opinions, but in the final analysis, it could still be explained by light scattered. At that time, Zhoushan had foggy weather, and the air was full of water droplets.

At this time, the ocean boat that was parked in Zhoushan was a ocean ship fishing north. In order to capture autumn saury, the red "fish lantern" would be used.

The stronger the light source, it is easier to capture a large amount of saury, so the fishing boat emits strong and bright red light. And because this is a ocean ship, it is about to go out of the sea. Before that, the testing equipment was tested, including the red light collection fish lamp.

Just that day, the fog was just a ocean boat that was about to go out of the sea. The red light shot in the fog composed of water droplets, scattered the concentrated light source, and turned the sky into blood red.

Within a few days, Blood -red sky also appeared in Fuzhou. On the same day, there were ocean fishing boats and heavy fog.

In fact, whether it is the doomsday green sky of Solst, or the blood -red sky of Zhoushan, it can be explained by the environment of optical principles. But it is still difficult to stop everyone's various gods ...

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Does not represent the position of the Institute of Physics of the Chinese Academy of Sciences

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Original title: "The sky in the United States is strange green, is it the end of the end?"

Source: Take the science home

Edit: Lezi Superman

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