Earth's magnetic poles change

Earth's core is too deep for scientists to directly measure its magnetic field. But to draw conclusions about changes in it can be, and by observation of the earth's field at the surface of the planet and in kosmose.Soglasno results of a new analysis of data in the core areas is to undergo rapid change in magnetic characteristics. According to the Geophysics Institute of Geophysics of Paris (Institut de Physique du Globe de Paris) Kull Arnaud (Arnaud Chulliat), the area may be responsible for the removal of the magnetic poles of the northern part of Canada.

North Magnetic Pole, which indicates a compass needle does not coincide with the geographic North Pole and is now close to Canadian Ellesmere Island. Although at the present time for the orientation is mainly used GPS, compass still find application in particular in underwater and underground research where there is no communication with the satellites. And travelers will not only rely on a single electronics: up to absolute reliability her away, and the charge of the battery has come to an end. Since the establishment of the origin of the magnetic pole in 1831, significant variations were observed before the start of the twentieth century. In 1904, the pole began to shift to the north-east at a speed of 15 km per year. By the end of 1980 the rate increased, and in 2007, scientists have gained new data — 55-60 km overcomes the pole every year, trying to Siberia.

Now, magnetic cards should be reviewed frequently to take into account when using the compass exact difference between magnetic north and the true. According to geologists, earth's magnetic field caused by the presence of iron in the core, surrounded by a spinning molten rock. It turns out "dynamo", generating a field. Because of its instability for researchers is not a surprise movement of the magnetic poles, although until the time of his arrival to the borders of Russia can not be determined — both speed and direction can still be changed. But experts do not consider the process of fast change of poles omen — the phenomenon that occurred in the last 780 thousand years ago. Over the past 330 million years, it happened 400 times and lasted for millennia.

Source: 3dnews

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