How did the blue sun appear in Beijing?

On March 15, the blue sun appeared outside the sky in Beijing, which aroused the amazement of many people around, because such a world was really rare, and it could be said that it was rare in ancient times. Many people are curious about this phenomenon and want to know why there is such a vision. Actually, the explanation is simple. It is because of the dusty weather in Beijing that day, because there are a lot of particles and dust in the air, and these particles have Michaelis scattering, so people will see the blue sun when they look at the sun.

Michaelis scattering: Because the particle size of dust is usually larger than the wavelength of visible light, the red-orange light with the closest wavelength is obviously scattered, and when looking back at the sun in the backlight, the red light is less and slightly blue.

This is actually a very normal scientific phenomenon. Due to the harsh conditions, people rarely see such a phenomenon in their lives. However, it can also be seen from this incident that dusty weather has a great influence on our lives, because people's travel and work have been greatly hindered in those days of dusty weather. In addition, Mongolia, the birthplace of sandstorms, also suffered huge economic losses. Many people lost their lives and disappeared in the sandstorm weather.

According to the data, the last sandstorm in Beijing occurred in 20 15. It can be said that there have been no sandstorms in these six years. This also shows that China's afforestation plan is effective and can effectively curb the occurrence of sandstorms, because afforestation can effectively stabilize sandstorms, intercept wind and reduce the intensity of strong winds. But for some special sandstorms, the effect is not particularly great. For example, the cause of this sandstorm is mainly caused by climate phenomena. In fact, in the face of natural disasters, the power of human beings will seem a little small, but now we have been doing our best to improve the natural ecological environment, and I believe that in the near future, the earth will be a very beautiful home.