With the appearance of dusty days in Beijing, a blue sun appeared in the sky in Beijing. Many people are incredible, explaining why the sun in the sky turned blue. Next, let's take a look at how the blue sun in Beijing is formed, hoping to help you!
What is the symbol of the blue sun in Beijing? 1
1. What is the symbol of the blue sun in Beijing?
On March 15, dusty weather appeared in Beijing. Everyone should have seen many online maps. Some netizens found that the sun in the sky turned blue, just like the sun seen on Mars. Gou Lijun, a researcher at the National Astronomical Observatory, said that this is because the dust particles in Beijing's atmosphere have Michaelis scattering, rather than the familiar Rayleigh scattering.
What is the constellation of the blue sun in Beijing?
2. How is the blue sun in Beijing formed?
Gou Lijun, a researcher at the National Astronomical Observatory, said that this is because dust particles in Beijing's atmosphere experienced Mie scattering, rather than the familiar Rayleigh scattering.
Michaelis scattering occurs when the diameter of particles in the atmosphere is equal to the wavelength of radiation. This scattering is mainly caused by particles in the atmosphere, such as smoke, dust, water droplets and aerosols. The scattering intensity of Michaelis scattering is proportional to the square of frequency, and the scattering of light in the forward direction is stronger than that in the backward direction, and the directivity is more obvious.
When the diameter of particles in the atmosphere is equal to the wavelength of radiation, this kind of scattering is called Michaelis scattering. For example, the particle size of cloud is close to the wavelength of red light (393.96THz, 0.76 15um), so the radiation of cloud to red light is mainly rice scattering. Therefore, cloudy and humid weather has a greater impact on mie scattering.
The blue sun in Beijing this time is due to the triple scattering phenomenon, and the red light is absorbed and then reduced, so the sun you see is blue.
What is the symbol of the blue sun in Beijing?
3. What is the blue sun on Mars?
The color of light is related to the wavelength. There is nothing in space that interferes with sunlight, so the sunlight is white. On some planets, light will be absorbed, reflected, refracted and scattered by the atmosphere or various kinds of dust, which will lead to the removal of light in some specific wavelength range in the sun, thus leading to the change of light color, as if the sun had changed color.
On Mars, we can see the sun that seems to emit light blue light. This is because the atmosphere of Mars is thin, but about 96% of the atmosphere is carbon dioxide, which absorbs light with longer wavelength and leaves blue light with shorter wavelength. Moreover, after the sandstorm, there are still all kinds of tiny particles in the atmosphere of Mars. These particles are very small and have strong blue light scattering ability, and the scattering intensity is close to 10 times that of red light. So, the light we see at this time is blue, just like the sun is emitting blue light, and the sun has turned blue.
So what you often see on Mars is the blue sun.