Declination question, what is the magnetic declination angle?

Disagreeing with the upstairs, the difference in declination caused by latitude seems to be purely a geometric effect of the bending magnetic field. It would be more accurate to look at the stars as a whole.

Many stars have an approximate dipole magnetic field distribution, such as the Earth, the Sun, etc., and the polar direction of the magnetic field is similar to but different. This difference, or the angle between the geomagnetic axis and the axis of rotation, is called the magnetic declination.

The origin of the magnetic field of the stars is inconclusive, however, because the angular momentum is conserved, if there is an electric current inside, there will naturally be a magnetic field distribution close to the rotational polarity. However, according to the theory of magnetohydrodynamic generators, because the interior of a star is mostly fluid, its rotation is non-rigid, and the configuration of the magnetic field may evolve significantly, such as the polarity reversal of the solar magnetic field every 11 years, which has been confirmed for a long time. In addition, some observations and theories suggest that the Earth's magnetic field will also invert, which may have catastrophic consequences, but the period is measured in 10-1 million years.

These magnetic field evolutions are big problems in academic circles.

The north and south poles of the geomagnetic field are not consistent with the north and south poles of geography, so in most parts of the earth the north arrow does not point due north, but there is a certain deviation, which is the magnetic declination.

of each placeMagnetic declinationThe difference is that the magnetic declination at the geomagnetic pole is 90 degrees.

In general, the value of the magnetic declination is measured, and there is a core in the interior of the earth.

A huge magnetic field is formed, with its s pole near the Earth's North Pole and its N pole near the Earth's South Pole, and its magnetic axis is the same as the Earth's axis.

It is not coincidental, and there is an angle between the potatoes, which is called the magnetic declination. In layman's terms, the magnetic declination refers to the magnetic needle stationary time difference handstove, which refers to the virtual angle between the north and the real north.

Introduction to the magnetic declination of some cities in China:1. The magnetic declination angle of Guilin is 1°22'；

2. The magnetic declination angle of Guiyang is 1°17'

3. The magnetic declination angle of Chengdu is 1°16'；

4. The magnetic declination angle of Guangzhou is 1°09'；

5. The magnetic declination angle of Liuzhou is 1°08'；

6. Dongsha Islands.

The magnetic declination angle is 1°05'；

7. The magnetic declination angle of Kunming is 1°00'；

8. The magnetic declination angle of Nanning is 0°50'；

9. The magnetic declination angle of Zhanjiang is 0°44'；

10, Pingxiang.

The magnetic declination angle is 0°39'。

is the angle between the horizontal projection of the magnetic field strength vector and the direction of due north, that is, the angle between the magnetic meridian and the geographic meridian. If the direction of the magnetic field strength vector is biased to the east in the direction of due north, it is called east, and if it is biased to the west in the direction of due north, it is called west.

According to the regulations, the magnetic needle indicates that the magnetic declination angle is positive if the north pole n is deviated to the east, and the magnetic declination angle is negative if it deviates to the west. Magnetic declination'It refers to the angle between the north and the true north when the magnetic or rapid needle is stationary. The magnetic north is more right-sided than the true north, and the magnetic shirt cover is declinated; Magnetic north is more left than true north, minus the magnetic declination; In our country it is generally subtracted.

The magnetic declination was discovered by the Portuguese maritime explorer Francisco de Almeida at the end of the 16th century. He noticed that the compass pointer of the ship did not point to true north, but deviated from a certain angle of oblique deception, which was the magnetic declination.

Magnetic declination refers to the angle between the north and south poles and the magnetic poles of the earth's geography, also known as magnetic declination or magnetic inclination. The Earth's magnetic field is not perfectly aligned with the Earth's geographical north and south poles, but is slightly tilted at an angle, which is due to the difference between the Earth's internal magnetic field and the Earth's axis, hence the magnetic declination. The magnetic declination changes with time and place.

In the fields of navigation, flight, exploration, etc., the accurate measurement and application of magnetic declination is very important. Fu Sui.

The geomagnetic dip in the Yangtze River basin was later called magnetic declination. Shen Kuo wrote in the twenty-fourth volume of "Mengxi Bi Tan" that the magnetic needle can guide, "but it is often slightly easterly, not all south".

This is the world's earliest surviving record of magnetic declination. In the West, it was not until 1492 when Columbus crossed the Atlantic that the phenomenon of magnetic declination was discovered, more than 400 years later than Shen Kuo.

The magnetic declination angle refers to the angle between the north and the true north when the magnetic needle is stationary. The declination angle varies from place to place, and since the magnetic poles are also in motion, the declination angle of a certain location will change accordingly.

Under normal circumstances, the magnetic declination angle in China can reach 6 degrees, and the general situation is two or three degrees. In the area of 25 degrees east longitude, the magnetic declination angle is between one or two degrees; In areas above 25 degrees north latitude, the magnetic declination angle is greater than 2 degrees; If it is at low latitudes of west longitude, the magnetic declination angle is 5 degrees to 20 degrees; The west longitude is above 45 degrees, and the magnetic declination angle is 25 degrees to 50 degrees. There is no doubt that Shen Kuo's discovery and understanding of magnetic declination inspired future generations.

Magnetic declination refers to the angle between the Earth's magnetic pole and the axis of rotation.