Why Zhoushan has a "bloody sky"

Why is there a "bloody sky" in Zhoushan? The "Zhoushan Sky" hot search triggered a hot discussion among netizens. It is reported that at around 8 pm on the 7th, many netizens photographed a strange sky in Zhoushan, and a short red sky appeared in the sky. Why is there a "bloody sky" in Zhoushan?

Why did "bloody sky" appear in Zhoushan1May 8th? A Weibo entry of "Zhoushan sky" rushed to the hot search: at 8 pm on the 7th, a rare red sky appeared in Zhoushan. User message: "Long time no see! Have a vision! " "Take a photo of your ID card!" "God, the natural landscape is so beautiful!" ……

Many inquiries confirmed that there was a red light in the direction of Putuo Pingyangpu. So where did this red light come from? What happened in Zhoushan that night?

According to the position analysis of the red light, it is found that the position is just at the dock of Zhouyu Company. The relevant person in charge of the company said that a number of ocean-going fishing boats were parked on the dock at that time. The ship is equipped with red light for fishing saury. Red light has the longest wavelength and strong penetrating power in visible light, so this phenomenon of red light all over the sky appears.

According to the analysis of Weibo netizen's "backbone in Shanghai SH", this is just a weather phenomenon, which can be explained by "Rayleigh scattering". "Last night, a large number of fine particles were gathered in the clouds near Zhoushan, of which particles with a diameter of about 0.7 microns accounted for the vast majority, and their diameter was similar to the red wavelength of the sun. After the breakup, the sky turned red. "

The netizen also mentioned, "According to Zhoushan, there was a fishing boat near the harbor at that time, and the red light happened to be on board, which aggravated the Rayleigh scattering effect."

According to experts from the space physics research team of China Geo University (Wuhan), according to the observation records of solar and geomagnetic activities, the geomagnetic activities were generally calm on May 7, and there was no obvious abnormality in solar activities, which basically ruled out the possibility that the sky turned red due to geomagnetic and solar activities.

The expert also said that the meteorological conditions in Zhoushan on that day were cloudy to rainy, foggy and the humidity in the lower atmosphere was high. "Because the lights of ocean-going fishing boats are red, the red light has a long wavelength and strong penetration. At the same time, under the scattering effect of droplets in the atmosphere, red light will be scattered to a far range, so it presents an abnormal red light phenomenon. "

"At that time, the sky in Zhoushan was cloudy and the water vapor was sufficient." The relevant person in charge of the local meteorological observatory told the reporter that the place where the red sky appeared was near the fishing boat, which may be caused by particles in the atmosphere scattering the light emitted by the fishing boat. The light source is unlikely to be the sun.

Therefore, the red light in the sky is not a special vision, but the ship light is scattered by water vapor in the air.

Why Zhoushan has a "bloody sky" On May 8, a hot search for "Zhoushan Sky" triggered a hot discussion among netizens.

It is reported that around 8 o'clock last night, many netizens photographed strange sky phenomena in Zhoushan, and there was a short red light in the sky. Is this the legendary UFO coming?

According to the analysis of Weibo Red V "the backbone in Shanghai SH", this is just a weather phenomenon, which can be explained by "Rayleigh scattering". "Last night, a large number of fine particles were gathered in the clouds near Zhoushan, of which particles with a diameter of about 0.7 microns accounted for the vast majority, and their diameter was similar to the red wavelength of the sun. After the breakup, the sky turned red. "

However, the well-known popular science blogger "China Meteorological Enthusiast" holds different opinions: "The air quality in Zhoushan was good last night, but it was foggy, and the lights from the ship were all red under the action of sea fog; When the lights on the ship were turned off, the red light disappeared. This can also explain why the red light appears at night and disappears quickly. "

Today, the staff of Zhoushan Meteorological Bureau responded that the redness of the sky belongs to the refraction and scattering of light. The weather was good that day, and there was more water in the atmosphere to form aerosol. The light source was the ship lights in the harbor.

After further analysis by Zhoushan media, it was found that the red light appeared at the dock of Zhouyu Company, and as can be seen from the ship news website, an ocean-going ship was stopping at the dock to catch saury in the North Pacific Ocean. Then the deputy general manager of Zhou Yu Company responded that the red light was the light of the company's saury boat.

The mystery is solved! The red light in the sky is not a special vision, but the light of fishing boats is refracted and scattered by water vapor in the air. ...

The sunset red we see on weekdays is also due to scattering.

The earth is surrounded by a thick atmosphere, and there are many particles in the atmosphere. When sunlight meets particles and molecules in the atmosphere, the direction of some rays will change, and they will be emitted in all directions, while the original direction of solar rays and energy will be weakened. This phenomenon is light scattering phenomenon, also known as Rayleigh scattering.

According to the explanation of Rayleigh scattering, the sky itself is not luminous. The color of the sky we see is actually that gas molecules in the atmosphere scatter sunlight into our eyes.

Rayleigh scattering research shows that the scattering intensity is inversely proportional to the fourth power of wavelength, that is, the shorter the wavelength, the easier it is to scatter. To put it more bluntly, when light travels through the atmosphere to the ground, blue-violet light is more easily scattered by atmospheric molecules because of its short wavelength, so from the ground, the whole sky appears blue.

Some friends may ask, why not purple? Although the wavelength of violet light is shorter than blue light, the sky finally looks blue, because the proportion of blue light in sunlight spectrum is higher than violet light, and human eyes are sensitive to blue light.

But why is the evening sunset red? Because at sunset, the sun is close to the horizon, and the atmosphere that sunlight needs to pass through is several times thicker than that at noon, according to the principle of "Rayleigh scattering", blue light with short wavelength is almost scattered, while red light has the longest wavelength and the longest propagation distance, so the final main color will be red light.

The sunset in the evening, like the red moon, is the result of Rayleigh scattering in the atmosphere.

More interestingly, if you fly from the ground to space by spaceship, the sky will become thinner with the atmosphere, and the scattering phenomenon will become less and less, and gradually turn from blue to black.

Why is there a "bloody sky" in Zhoushan? On the evening of May 7, a rare "vision" suddenly appeared over the sea area of Putuo District, Zhoushan, Zhejiang Province, and the whole sky was dyed blood red. After the local netizens photographed the scene in front of them and sent it online, it quickly caused a heated discussion, because such a phenomenon is really rare.

Many netizens expressed disbelief after seeing the video, and even began to use "metaphysics" to explain what happened in front of them, thinking that this might be a sign before the natural disaster came.

Seeing the comments of netizens, Dachuan also began to doubt whether such a "vision" was really related to the disaster.

However, as a popular science person, it is necessary for Dachuan to take all his friends and rationally analyze the reasons for this "vision" from a scientific point of view.

1770 abnormal blood-red sky

Seeing the "vision" in Zhoushan, Zhejiang, Dachuan couldn't help but think of the blood-red sky event that happened at 1770.

The time goes back to 1770, that is, 35 years of Qianlong. According to historical records, "the night of July 28th was red and the sky was cloudy in the north".

It is reported that the sky turned into a blood-red "scene" at that time, which lasted for 9 days.

During this period, people become nervous and think that this is a sign of natural disasters. As for the cause of the "vision", it once became a mystery that puzzled the world.

Not only our country at that time, but also our neighboring countries, such as Japan and South Korea, also encountered such a vision, and all of them were recorded in historical materials.

1770 causes of "abnormal sky"

247 years after this event, that is, 20 17 years, Japanese scientists sorted out hundreds of historical materials and combined with the analysis of European astronomical observation records, and finally found the' root cause' of the "anomaly".

It turns out that in 1770, the sunspot area increased sharply, and a strong solar storm hit the middle and low latitudes of the earth.

During this period, when the high-energy particles released by the solar storm reach the earth, they will collide violently with the gas in the atmosphere, and they will emit different colors of aurora during the collision. For example, when oxygen is hit by high-energy particles, it will emit red, yellow and green light. You can compare this with the aurora appearing in the polar regions.

aurora

However, because the solar storm at that time was too strong, high-energy particles went deep into the oxygen-rich position in the atmosphere, so that people living in the middle and low latitudes could see the red aurora with their own eyes.

Although the scope of the "vision" in Zhoushan, Zhejiang Province is much smaller than that recorded in the historical materials of that year, the scene is very consistent with the statement that "the red gas is far north" recorded in the historical materials.

So, is the cause of this "vision" also related to the solar storm?

Cause analysis of Zhoushan's "anomaly"

Although the solar storm is the possible cause of the red aurora, experts from China Geo University denied the cause shortly after the "abnormal phenomenon" appeared in Zhoushan, Zhejiang. Because according to experts' research and analysis of solar and geomagnetic activities, the solar activity was not strong on May 7, and the geomagnetic activity tended to be stable. In this way, from the cause analysis, there is no possibility of aurora formation at all.

Then, in that case, what is the reason for the formation of Zhoushan's "vision"?

1

Speaking of it, after excluding the influencing factors of solar storms, the most likely reason falls on "light pollution".

Because the specific location of the incident is over the sea area of Putuo District, Zhoushan, Zhejiang Province, the atmospheric humidity is high, and the night coincides with the yellow warning of fog. Some ocean-going fishing boats operating near the sea area often turn on the red "fog lights" in this weather condition, because the red light has a longer wavelength and stronger penetration in the spectrum, so the red "fog lights" are more easily noticed by others. But it is precisely because of this feature of ocean-going fishing boat "fog light" that Zhoushan "vision" finally appeared.

2

Simply put, the reason of Zhoushan's "vision" is actually the most common phenomenon of light refraction and scattering in life.

The red light emitted by the fog lamp will be refracted and scattered by the aerosol formed by water molecules in the fog. When a large amount of red light is refracted and scattered into the air, a blood-red sky will eventually appear over Zhoushan.