How is the geomagnetic field formed

On the outside of the Earth, magnetic inductance lines come out of the geomagnetic north pole and enter the earth at the geomagnetic south pole. Therefore, as depicted in the diagram, the earth is round, and the magnetic inductance lines must be drawn elliptically, and the radius of curvature of the two is different.

The two men are located in the northern hemisphere, about Beijing, with the top of their heads, the north on the left, and the south on the right.

The earth's magnetic field is the result of the moving electric field in the liquid iron core, similar to the bar magnet, divided into north and south poles, the magnetic field lines from north to south, but the earth's core is molten, so the earth's magnetic field is induced by the circulating current of the core, the earth's magnetic field is weakening, and it is possible to flip.

Where does our protective magnetosphere come from? Let's take a look at the Earth's magnetic field and how it interacts with the Sun.

Before we can understand how the geomagnetic field works, we first need to have a basic understanding of magnetism. A magnetic field is formed when an electric charge passes through a magnetic material like iron.

The direction of the magnetic field lines represented by iron filings sprinkled on paper above the bar magnet.

Wikipedia. Any magnetized material is bipolar, which means it has a north pole and a south pole, with magnetic field lines running from north to south. The magnetic field lines at the north pole return to the south pole, creating an external magnetic field outside the material, which affects other objects that are too close together.

You may be familiar with bar magnets, which are very similar in nature to the geomagnetic field. Imagine a giant bar magnet passing through the Earth's core, from one pole to the other, and you'll see something like this. However, the Earth's core is molten, so our geomagnetic field is caused by circulating currents at the Earth's core.

One consequence of this is that the geomagnetic field occasionally reverses. It is believed that the geomagnetic inversion occurs on average once every 200,000 years.

To make a further analogy between a bar magnet and the Earth, coincidentally, the south pole of the geomagnetic field is located exactly at the geographic North Pole, and the North Pole is located at the geographic South Pole. When someone mentions "magnetic north," they are actually referring to the south pole of the earth.

The geomagnetic field consists of two parts: the basic magnetic field and the variable magnetic field. The basic magnetic field is the main part of the geomagnetic field, which originates from the interior of the solid earth, is relatively stable, and belongs to the part of the static magnetic field. The variable magnetic field includes various short-term changes in the geomagnetic field, which mainly originate from the outside of the solid earth and is relatively weak.

The magnetic field of earth change can be divided into two types: calm change and disturbance change.

Marching and sailing use the action of the geomagnetic field on the compass to orient themselves. One can also look for mineral deposits based on the characteristics of the geomagnetic field distributed on the ground. Changes in the geomagnetic field can affect the propagation of radio waves.

When the local magnetic field is strongly disturbed by sunspot activity, long-distance communication will be seriously affected or even interrupted. In the absence of a geomagnetic field, a strong stream of charged particles (commonly known as the solar wind) emitted from the sun would not be deflected by the geomagnetic field and would hit the Earth. Under the bombardment of such energetic particles, the composition of the Earth's atmosphere may not be what it is now, and life will not be able to exist.

Therefore, the "umbrella" of the geomagnetic field is very important to us.