What does the appearance of the aurora portend? What is the reason for the appearance of the aurora

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.

Auroras mostly occur near the north and south poles, but rarely 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.

Foreshadowing the appearance of miracles.

Auroras are a phenomenon produced by the interaction of a stream of high-energy charged particles from the Sun with the Earth's magnetosphere. When these charged particles enter the polar regions of the Earth's magnetic field, they collide with the gas molecules in the Earth's atmosphere and excite light. These rays take on a variety of different colors and shapes under the action of the earth's magnetic field, forming the beautiful aurora.

Intense activity on the sun, such as limb solar storms and coronal mass ejections, will release a large number of charged particles into the solar system, some of which will be bound by the earth's magnetic field to form radiation belts around the earth, and the other part will flow along the magnetic field lines in the direction of the earth's magnetic poles, when these charged particles flow through the atmosphere, they will collide with gas molecules, excite various colors of light, and form auroras.

Since the position of the Earth's magnetic poles is not fixed, but constantly changing, the appearance of auroras is also irregular, but when the solar activity is intense, the frequency and intensity of the aurora will increase. The aurora is a mysterious and beautiful natural phenomenon that brings endless imagination and interest in exploration.

Auroras occur due to the sun's stream of charged particles (solar wind) entering the earth's magnetic field, and the brilliant and beautiful brilliance appears at night in the high altitude near the north and south poles of the earth.

It is known as the Southern Lights at the South Pole and the Northern Lights at the North Pole. Earth's aurora is 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 Earth's magnetosphere or the Sun. Auroras often appear in the sky above the geomagnetic pole at latitude, generally in the form of bands, arcs, curtains, and radials, and these shapes are sometimes stable and sometimes change continuously.

There are three conditions for the production of auroras: large laughing gas, magnetic fields, and high-energy charged particles. All three are indispensable.

Aurora is a process of mass discharge around the Earth. Charged particles from the Sun reach the vicinity of the Earth, and the Earth's magnetic field forces a portion of them to concentrate along the field lines to the north and south poles. When entering the upper atmosphere of the polar regions, it collides with and excites atoms and molecules in the atmosphere to produce light and form auroras.

The main colors of the aurora are:

1. Red: At the highest altitude, the wheel shortage is dominated by atomic oxygen, and the excited atomic oxygen (O) transition often emits light with a wavelength of 630 nanometers (red); Due to the low concentration of atomic oxygen and the low sensitivity of the human eye to light at this wavelength, it is easy to see the aurora of this color at night only when the solar activity is very strong.

2. Green: At low altitudes, particles collide frequently, which inhibits the process of red light, and green light (nanometers) is the main one. The excited molecule nitrogen (N2) transmits energy to the oxygen atom (O) through a collision, which then radiates light at a green wavelength.

3. Pink or yellow: It is made by mixing the process of green light and red light in a certain proportion and working together.

4. Blue: At lower altitudes, molecular nitrogen and molecular nitrogen ions dominate some aurora processes, among which the emission of light (blue) with a wavelength of 428 nanometers is the main one.

Scientifically speaking, the aurora occurs all year round, but it is difficult to see with the naked eye in the summer or during the day.

According to the data, the aurora appears in two halos around 67 degrees north and 67 degrees south, and Fairbanks in Alaska is the best place to see it from a global perspective. Known as the capital of the Northern Lights, the Northern Lights appear on more than 2 days a year.

Depending on the geographical distribution of countries around the world, the Northern Lights can be seen in Iceland, Finland, Sweden, Norway, Canada, Alaska and Argentina.

Mohe is the best city in China to see the aurora, and it is easy to see the aurora in about nine days before and after the summer solstice every year.

What is AuroraAurora is a brilliant and colorful luminescent phenomenon that occurs when the sun's stream of charged particles (solar wind) enters the earth's magnetic field, and the brilliant and beautiful light appears at night in the high altitude near the north and south poles of the earth. Auroras are the most beautiful and incredible natural phenomena that people can see, and they are the only solar-terrestrial space phenomenon that can be seen with the naked eye on the ground during solar storms. The more spectacular the aurora, the more intense the solar eruption.

The cause of the auroraA large number of charged particles erupt from the sun and blow into interplanetary space at a speed of several hundred kilometers per second, forming the solar wind. Particles that reach near the Earth constantly hit the Earth's magnetic field and flow around the Earth. Under the blowing of the solar wind, the Earth's magnetic field is no longer symmetrical and has become somewhat streamlined.

Due to the interaction with the interplanetary magnetic field, a funnel region of magnetic field lines is formed outside the poles of the deformed Earth's magnetic field. When there is a disturbance in the magnetosphere, the charged particles of the magnetic tail are accelerated, move along the magnetic field lines, pour down the edge of the funnel like flowing water into the funnel area, and hit the gas molecules and atoms in the upper atmosphere, causing the latter to be excited, deexcited and glowing, so that this beautiful light is produced. When a solar storm occurs, the magnetospheric disturbance becomes intense, and a geomagnetic storm occurs.

At this point, a wider range of colors of monochromatic light is fired. These lights are mixed together to create a colorful, bizarre and spectacular aurora, like a colorful neon sign. To use a figurative analogy, it can be said that the aurora activity is like a live television picture of the earth's magnetosphere activity.

The Earth's magnetosphere is a huge television picture tube that concentrates the stream of solar wind particles that enter the upper atmosphere into a beam and focuses it on the Earth's polar regions. The sedimentation particles are the electron beam of the television, the earth's magnetic field is the electron beam-directed magnetic field, the atmosphere of the earth's polar regions is a fluorescent screen, and the aurora is the moving image on the television screen. When did the aurora appearAmong the regions where the aurora borealis are abundant, Northern Europe is the most eye-catching destination.

Northern Europe is located in the Arctic polar region, the aurora phenomenon has all year round, but the summer aurora can not be seen by the naked eye, every year from September to April of the following year, it is the high incidence period of the aurora, and it is also the most suitable period for the aurora. Northern Norway is the best place in the world for the Northern Lights in terms of geographical location, temperature comfort and probability of occurrence. In Mohe, China, the Northern Lights are most visible during the nine days around the summer solstice, although they may appear all year round.

Because there are often clear skies around the summer solstice, when there is no cloud barrier between the North Pole and the Mohe, people can see the magnificent Northern Lights. Generally speaking, the aurora is usually observed at night around the summer solstice every year, and even if the aurora appears during the day, it is not easy to see the aurora because the sunlight is bright during the day and the aurora is small.