21.12.2012. Earths magnetic field. Disappear or not?

07.12.2012

 

The change of the magnetic poles is a holder of the alleged reasons for the end of the world, which is expected to December 21, 2012 the first year. Science today is powerless to give a precise answer, as far as possible a sharp reversal, however, scientists continue to explore this natural phenomenon.


French researchers from the University of Paris VII Denis Diderot name found that the change of the magnetic poles may occur at any time. According to them, predict the polarity reversal is possible only in 10-20 years. A more long-term and accurate prediction is impossible.

The inversion of the magnetic poles of the Earth, which have repeatedly occurred in the past, followed by a brief disappearance of the magnetosphere. For the Earth's biosphere that means thinning of the ozone layer and the disappearance of protection from the solar wind and cosmic radiation. If the "reversal" will end soon, life on our planet may survive, but if the land will be left without a magnetic field for several years, it would mean the death of all living things, writes sunhome.ru

Now the magnetic field of the earth is falling. Over the past 22 years, Earth's magnetic field was weaker by 1.7%, and in some parts of the Atlantic Ocean, it has weakened by 10%, and in some regions a little stronger.

The shift of the magnetic poles of the Earth was recorded in 1885. Since then, the south magnetic pole shifted by 900 kilometers in the Indian Ocean and the North Magnetic Pole — in the direction of the East Siberian magnetic anomaly. The drift velocity pole now stands at about 60 kilometers per year, which has never previously been observed.

Earth's magnetic poles


Magnetic Pole — notional point on the earth's surface in which the magnetic field of the earth directed strictly an angle of 90 ° to the surface.

North Magnetic Pole


Moving north magnetic pole of the Earth since the beginning of the XVII century.

The location of the north magnetic pole does not coincide with the geographic north pole. From about the beginning of the XVII century the pole is located under the pack ice at the borders of the current Canadian Arctic. This leads to the fact that the compass needle points north not exactly, only approximately. Every day the terminal moves in an elliptical path, and moreover, moves north and north-west direction at a speed of about 10 km per year, so it any time and position are inaccurate. Since the second half of the twentieth century, the pole is moving quickly in the direction of Taimyr. In 2009, the rate of movement of the north magnetic pole was 64 kilometers per year.

As stated in 2005 in Ottawa, the Canadian head of Geomagnetic Laboratory of the Ministry of Natural Resources Larry Nyuitt, the north magnetic pole of the Earth, at least 400 years "owned" Canada, "left" to the country. Having the property of a magnetic pole shift, about the beginning of the seventeenth century, which was located under the pack ice in the Canadian Arctic boundaries today, gone beyond the 200-mile zone of Canada.

South magnetic pole


The location of the south magnetic pole does not coincide with the geographic south pole. Currently, he is on the edge of Antarctica.

Polarity


Traditionally, the end of the magnet, indicating the direction to the north is called the north pole of the magnet, and the opposite end — the south. It is known, however, that like poles repel, rather than attract. This implies that the geographic north magnetic pole pointed to the north (blue) part of the compass, from the physical point of view is the south pole. As noted above, the difference between the geographic north pole and the magnetic north pole of the Earth is negligible. Therefore, with a certain error can be argued that the blue part of the compass arrow pointing north (meaning the geographical north magnetic pole and the north pole of the Earth).

Geomagnetic Pole


Geomagnetic pole is the point where the axis of the magnetic dipole (which is the main component of the expansion of the magnetic field of the Earth multipole) intersects the surface of the Earth. Since the magnetic dipole is only an approximate model of the magnetic field of the Earth, the geomagnetic poles are slightly different in its location from the true magnetic poles where the magnetic inclination is 90 °.

In 1831, the British polar explorer John Ross in the Canadian archipelago was discovered the magnetic north — an area where a magnetic needle in a vertical position or inclination is 90 °. In 1841, James Ross (nephew of John Ross) has reached the south magnetic pole of the Earth, located in Antarctica.

Author: John John the


Like this post? Please share to your friends: