Why do there are geomagnetic north and south poles on Earth?

It is produced by the flow of hot lava in the earth's crust, but scientists have determined that it will disappear in about 2,000 years, and then life on Earth will be exposed to cosmic rays.

In the movie "The Destruction of the Center of the Earth", it is said that the magnetic field generated by the earth, I don't remember clearly, it is due to the rotation of the material of the earth's core and mantle (it seems to be the mantle), you can go and watch it, this is not a movie, but it is quite good.

The geographic north pole is the geomagnetic south pole.

The earth is like a giant magnet that is magnetic and forms a permanent magnetic field around it. Because of the compass.

guide, and because the geomagnetic opposites attract, so it is actually the geographical North Pole. The north and south poles measured by the compass are called geographical north and south poles, and the small magnetic needle goes up north and down south, and the magnetic inductance line.

From its s pole in, the n pole out.

So in the interior of the earth there is actually the s pole above and the n pole below, which is called the geomagnetic north and south poles. So the south pole of geography is the north pole of geomagnetism, and the north pole of geography is the south pole of geomagnetism.

Causes and effects of geomagnetic pole deflection:

Geologists believe that the magnetic north pole shifts mainly by molten Earth's core, which contains liquid metals.

iron). Scientists first identified the location of the magnetic north pole in 1831, and since then they have struggled to keep up with the changing process of the magnetic pole.

Records show that the magnetic north pole barely changed in the first few decades. After 1904, however, it began to move northeastwards at a rate of about 15 kilometers per year. In 1989, the rate of transfer of the magnetic north pole increased significantly, and scientists speculate that it may be related to the mysterious magnetic "plume" deep in the earth.

The Earth's magnetic north pole is moving towards Russia at a speed unprecedented in human history, which poses a great threat to the safety of modern transport systems and the traditional navigation routes of migratory animals. Birds and migratory marine animals that fly south every winter.

It is subject to interference from changes in the magnetic poles. Whales and turtles.

Longevity animals may also have to "calibrate" their navigation systems in the future.

Not the same. The Earth's North Magnetic Pole (n-pole) is near the Earth's Geographic South Pole, and the Earth's South Magnetic Pole(s) is near the Earth's Geographic North Pole.

Because the geographical north and south poles are artificially defined, and the geomagnetic north and south poles are determined according to the direction of the magnetic inductance lines.

The magnetic inductance line inside the magnet points from S to N, and the earth is equivalent to a magnet, and it is found that the magnetic inductance line inside it is pointed from the geographic north pole to the geographic south pole, so the geographical north pole is near the geomagnetic south pole (S), and the geographic south pole is near the geomagnetic north pole (n).

In fact, this concept is easy to confuse and not easy to understand. It is said that in Europe and the United States, the geomagnetic north and south poles are consistent with the geographical north and south poles, and the geomagnetic north pole near the geographical north pole is the geomagnetic north pole. It's much easier to understand that way.

The direction of the geomagnetic field is from the north pole of the earth to the south pole of the earth. The earth itself is a huge magnet, and the magnetic field around the earth is called the geomagnetic field, the geomagnetic north pole is near the geographical south pole, and the geomagnetic south pole is near the geographic north pole, so the direction of the geomagnetic field is from the geomagnetic north pole to the geomagnetic south pole.

An overview of the geomagnetic field

Geomagnetic field refers to the natural magnetic phenomenon that exists in the interior of the earth. The Earth can be thought of as a magnetic dipole with one pole near the geographic north pole and the other near the geographic south pole. The imaginary linear magnetic axis through these two poles is tilted approximately the same degree as the Earth's axis of rotation.

The Earth's magnetic field extends tens of thousands of kilometers into space, forming the gravitational pull of the Earth's magnetosphere. The Earth's magnetosphere acts as a barrier to the Earth from charged particles carried by the solar wind. The Earth's magnetosphere is squeezed by the force of charged particles on the solar surface in the daytime region, and extends outward on the dorsal surface of the Earth's night region.

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.

The midpoint of the bar magnet is hung with a thin wire, and when it is stationary, its two ends point to the south and north of the earth, the one end pointing north is called the north pole or n pole, and the one end pointing south is the guide pole or s pole.

If you think of the Earth as a large magnet, the Earth's magnetic north pole is the guide pole, and the geomagnetic south pole is the north pole. Between magnets and magnets, the poles of the same name are repelled and the poles of the same name are attracted. So, the compass.

Repelled from the South Pole, the north arrow.

It is opposed to the North Pole, while the compass is attracted to the north needle of the Finger Orange.

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 structure of the earth is complex, and the polarity of its internal magnetic field is constantly changing, but, generally speaking, the location of the geomagnetic south pole near the north pole of the earth is due to the strong reversal of the earth's internal magnetic field, that is, the earth's internal magnetic field changes from the original north pole polarity to the south pole polarity. This anti-** was born at a certain time in the history of the earth, which may have been 2 million years ago or 100,000 years ago, and it is not completely certain. The Earth's magnetic poles have been reversed many times, each time at a different and uncertain time.

The geographic south pole is the magnetic north pole because opposites attract. The geomagnetic pole of the Northern Hemisphere is called the geomagnetic north pole (the physical magnetic field south pole) (the geomagnetic pole of the southern hemisphere is called the geomagnetic south pole) (the physical magnetic field north pole), and the coordinates of the geomagnetic north pole in 1996 are ,.

The earth is a sphere with uneven changes in magnetic field intensity, in the 20s of the 19th century, the famous German mathematician Gauss published a theory about the earth's magnetic field, the earth is regarded as a sphere with uniform magnetic field strength and the magnetic pole deduced by mathematics, called the earth's magnetic north and south poles, is a theoretical value used for theoretical analysis of the earth and its magnetic field changes in time and space, it is not consistent with the north and south poles of the earth, and there is 11 ° 30 in between'of the included angle.

The earth is a magnet.

What does it mean for the earth to be considered a magnet. There is often a misconception, and (Figure 1) provides an excellent example of this misunderstanding. Can you see what's wrong?

Starting with some definitions and conventions of physics is a good place to start. My middle school physics textbook says that if a bar magnet is suspended by a rope or mounted on a pivot, one will find that the bar magnets are roughly aligned in a north-south direction, and the same end of the bar magnet always points north.

For this reason, we call the end of the magnetic stripe toward the North Pole the n-pole and the end toward the South Pole the s-pole. This way we can mark the n pole or the s pole of all bar magnets.

So far so good. But this definition doesn't apply to the Earth itself, because we can't let the Earth hang up to see which direction its magnetic force is pointing. So we have to consider some of the properties of magnetism and see if we can come up with a consistent answer about the Earth.

Let's consider that the lines in Figure 1 are designated as "magnetic field lines". How do you understand these magnetic field lines? Consider Figure 2, which shows a lot of the classic magnetic test, where many small iron filings are scattered on a magnet rod on a piece of paper.

The small iron filings act like a small compass pointing at one pole of the magnet (see Figure 3). Chip lines show no direction. However, we need to further consider the performance of the bar magnet and its poles.

Physics textbooks generally describe it this way: "When they are moved freely by attaching magnetic rods or hanging them on shafts, we find that the two magnets are repelled by the same poles, yet the different poles are attracted to each other." "With a slender magnetizing needle, the magnetic properties between one or several magnets can be measured, as well as the forces between individual, nearly isolated poles.

This experiment was first done by the physicist Charles Coulomb (1736-1806), a Frenchman, and was completed in 1785. Coulomb first discovered that the repulsive force between the two n-poles is inversely proportional to the square of the distance between them. He also found that the force is directly proportional to the strength of the magnetic pole).

Here there is a relationship similar to the gravitational force between opposite poles in inverse proportion to the square of the distance, but in the opposite direction of the repulsive force.

So we can imagine placing a magnetic needle around the n pole of the magnetic rod and drawing the net force on the magnetic needle. This.

A concept of the magnetic field generated by the magnetic force acting in a magnetic rod is provided, similar to the electrostatic field around an electric field (Figure 4).

Now we are ready to consider the behavior of the compass in light of these concepts. From Figure 5 we can see what happens to the compass in a magnetic field. Its pointer is oriented in the direction of the magnetic pole of the magnetic rod, i.e., the direction of the magnetic force from the n pole of the magnet to its s pole.

So we have the answer to our original question: How do we see the Earth as a (bar) magnet? The answer is a counter-intuitive statement, it is a "magnet", the n pole with a magnetic field is at the south pole of geography, and the north pole of geography is the s pole of the magnetic field.

That is, n and s in Figures 1 and 3 should be reversed!

This result is a nightmare for most physics books.