Everyone knows geomagnetism, where is the direction of geomagnetism?

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 magnetic north pole is near the geographic south pole; The geomagnetic south pole is near the geographic North Pole, but it does not coincide.

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.

The origin of the Earth's magnetic field

The hypotheses about the origin of the geomagnetic field can be divided into two categories: the first type of hypothesis is based on existing physical theories; The second type of hypothesis takes a unique approach, arguing that for a cosmic object such as the earth, there are special laws that are different from the existing known theories.

The first type of hypotheses include the rotational charge hypothesis, the geomagnetic field hypothesis with the earth's core as a precondition, the drift current hypothesis, the thermal effect hypothesis, and the Hall effect hypothesis.

1) There is the rotational charge hypothesis that there is an equal amount of opposite-sex charge on the earth, one distributed in the interior of the earth and the other distributed on the surface of the earth, and the charge rotates with the earth, thus creating a magnetic field.

2) The geomagnetic field hypothesis, which presupposes the earth's core, holds that the formation of electric current in the earth's core should occur by induction when the metal material in the earth's core moves vortex in the magnetic field. At the same time, the field in the form of the electric current itself is a continuous regenerative magnetic field, as in the case of a generator.

The direction of the geomagnetic field is from south to north. The Earth's magnetic field is the magnetic field distributed in the space around the Earth. The dipole type approximates placing a magnet rod in the center of the earth, with the north n pole of the geomagnetic field near the geographic south pole and the south s pole of the geomagnetic field near the geographic north pole.

The magnetic pole does not exactly coincide with the geographical pole, and there is a magnetic declination. The distribution of magnetic field lines is characterized by the fact that the direction of the magnetic field near the equator is horizontal, and the near poles are perpendicular to the earth's surface. The magnetic field is weakest at the equator and the strongest at the poles.

The magnetic field on the earth's surface changes over time due to various factors.

Overview

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 from the sun, usually called the solar wind, would not be deflected by the geomagnetic field, but would shoot directly at 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. So the geomagnetic field is a very important umbrella for us.

This problem can only be solved by drawing, and the curve with the arrow in the figure below is the magnetic line of the geomagnetic field. 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, like the orange bridge drawn in the picture, the earth is round, and the magnetic inductance line must be drawn as an ellipse, 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 figure below is an analysis of the magnetic field where the two are located

b is the magnetic induction intensity of the person's position, tangent to the magnetic inductance line, can be decomposed into b1 and b2, as can be seen from the figure, b1 to the north, b2 downward.

So the geomagnetic field is diagonally downward in the Northern Hemisphere. In the same way, the geomagnetic field is northward and upward in the Southern Hemisphere.

And the angles in the diagram are very small in practice.

On the outside of the Earth, the direction of the geomagnetic field is from south to north. Near the Earth's axis, it is directed from north to south.

The direction of the geomagnetic field on the earth's surface is directed north by the south sail crack, which is slightly different from the meridian and the feast. In the interior of the Earth, the direction of the geomagnetic field is closed from north to south. There is also a certain deviation from the axis of rotation.