Auroras often appear over the north and south poles of the earth, and what is the cause of the auror

Aurora is an atmospheric optical phenomenon. When sunspots and flares are violently active, the sun emits a large number of strong streams of charged particles, moving along the magnetic field lines of the geomagnetic field to the north and south poles, and it enters the upper layers of the earth's atmosphere at a very fast speed, and its energy is equivalent to the power of tens of thousands or hundreds of thousands of hydrogen bombs. Due to the high speed of charged particles, when they collide with atoms in the air, the electrons in the outer shell of the atoms gain energy.

When the energy gained by these electrons is released, it emits a visible beam of light, a fascinating color known as the aurora.

There are two large magnetic fields at the poles of the earth, and the flow of charged particles is affected by the earth's magnetic field, and the flight path will be deflected to the poles, and the particle flow formed in the polar regions is more than in the middle latitudes, and people can observe the aurora in the high latitudes There are more opportunities for people to observe the aurora. The one that appears in the North Pole is called the Northern Lights, and the one that appears in the South Pole is called the Southern Lights.

Auroras usually come in a variety of shapes, such as bands, arcs, curtains, or radials. Because the air contains hydrogen, oxygen, nitrogen, helium, neon, argon and other gases, under the action of charged particle streams, various gases emit different lights. For example, neon gas emits red light, argon gas emits blue light, ,......Therefore, the colors of the aurora are also colorful and varied.

Auroras tend to appear suddenly and disappear after a period of time.

In Sweden, Norway, the former Soviet Union and northern Canada, the aurora can be seen about 100 times a year, mostly in spring and autumn. In the Hudson Bay region of northern Canada, the Northern Lights are seen about 240 times a year. In the Mohe area of Heilongjiang Province, the northernmost part of China, people can often see the colorful Northern Lights.

The aurora is a natural phenomenon that occurs over the north and south poles, and the dazzling light bands are breathtakingly beautiful, so how did the aurora form? When it comes to the aurora, we have to start with the sun.

Answer]: C Modern science believes that aurora is a colorful luminescence phenomenon that often occurs in the atmosphere above the geomagnetic region near the geomagnetic region at high latitudes, and is produced by the excitation or ionization of molecules or atoms in the upper atmosphere by the sun's stream of energetic particles. There are three conditions for the aurora to occur:

Atmospheric age, magnetic field, solar wind. All three are indispensable. Only item C correctly explains the cause of the aurora call.

Therefore, C.

1. The polar forest light of the earth is a luminous phenomenon of atmospheric particles produced by the excitation (or ionization) of molecules or atoms in the upper atmosphere by a stream of high-energy charged particles (solar wind) from the sun.

2. Because the high-energy charged particles from the sun will be affected by the earth's magnetic field and concentrate in places with high magnetic field strength, and the earth's magnetic field is the strongest in the poles, and under the action of the earth's magnetic field, these high-energy particles turn to the polar region and excite gas molecules to emit light near the polar region, so the aurora is commonly found in high magnetic latitude regions. Auroras often occur in the range of about 25° to 30° from the magnetic pole, and this area is called the aurora zone.

3. Auroras do not only appear on Earth, but also on some other planets in the solar system with magnetic fields and atmospheric branches.

How the aurora is formed.

Auroras are caused by charged particles in the thin atmosphere at high altitude, and under the action of the flow of charged particles, the light emitted by various gases is also different, so there are various auroras of different shapes and colors, which are beautiful and spectacular.

The aurora that people see is mainly caused by electrons in the stream of charged particles. Moreover, the color and intensity of the aurora also depend on the energy and number of sedimenting particles. To use a figurative metaphor, it can be said that the aurora activity is like a live television screen of magnetospheric activity.

The sedimentation particles are the electron beam of the television, the earth's atmosphere is the television screen, and the earth's magnetic wheel is the electron beam-guided magnetic field. Scientists get a lot of information about the magnetosphere and electromagnetic activity in solar-terrestrial space from this large natural television. For example, polar spectroscopy analysis can be used to understand the sedimentation particle beam**, the type of particles, the magnitude of energy, the structure of the Earth's magnetic acre collapse, the interaction between the Earth's magnetic field and the planetary magnetic field, and the mode and extent of the impact of solar disturbance on the Earth.

Why do auroras appear at the poles of the Earth.

Auroras mostly occur near the north and south poles, but very few occur in the equatorial region, why is that? The reason is that the Earth resembles a giant magnet, and its magnetic poles are near the north and south poles. The compass we are familiar with is affected by the geomagnetic field, always pointing to the north-south direction, and the flow of charged particles from the sun is also affected by the geomagnetic field, and approaches the north and south poles of the geomagnetic field in a spiral motion.

So the aurora mostly appears in the sky near the north and south poles. What happens in the South Pole is called the Southern Lights, and what happens in the North Pole is called the Northern Lights. Our country is in the northern hemisphere, so in our country you can only see the Northern Lights.