RSS

The change magnetic poles of the earth

30 Nov

magnetic polesGerman scientists found that the Earth’s magnetic field is developed with incredibly fast since modern humans first mastered Europe, reversing the poles of its less than a thousand years, news agencies reported, with reference to the German Research Center for Geo sciences.

Previously it was thought that the Earth’s magnetic poles switch places every few hundred thousand years. However, German scientists have refuted this theory. According to an expert on geomagnetism of the German Research Centre of Geosciences Norbert Novatsuk, now the magnetic poles change places only 41 thousand years ago – soon after modern humans came to Europe – and turned around again in less than a thousand years after that.




Reversal of the magnetic poles is of great importance, especially in today’s world, as a consequence of significant weakening of the magnetic field of the planet, which protects people and ground-based communications from the damaging effects of space radiation.

A group of researchers from Florida International University (Florida International University) under the direction of Brad Clement (Brad Clement) analyzed the changes in the magnetic field of the Earth that have occurred throughout its history. It is known that the magnetic field is changed from time to time, and sometimes the magnetic poles of the planet suddenly and quickly reversed.

These great events especially interested scientists, especially since in general – in the mechanism of generation of the Earth magnetic field and in the patterns of his behavior to science are still many blind spots. For example, over the past 15 million years had four pole shift every 1 million years or one reverse on average for every 250 thousand years. However, according to Clement, the last such coup was 790 thousand years ago. We can assume that we are on the eve of the next grand change that somewhat delayed.

But this is not necessarily so. Reversal is not strictly periodic. We do not know whether they are natural and necessary. However, there are some interesting signs of impending change. Thus, the magnetic field of the planet has dropped substantially over the past two decades, and over the last 150 years, the reduction was 10%.

But it is a weakening of the field, according to scientists, is preceded by a change of the poles. The only consolation is that this change occurs rapidly only by geological standards – it takes thousands of years. In general, both in humans and animals have time to adjust to the new direction of the magnetic field.

NORTH-SOUTH WILL
Reason to shudder (knowing people, of course) gave little information published in the scientific journal Geophysical Research Letters. A group of French researchers led by the University of Khulo Gauthier Denis Diderot in Paris, which has long been studying the anomalies of the magnetic field of the Earth, said: There is no way to predict exactly when the planet’s magnetic poles change places and there will be a so-called inversion. That is, in the literal sense of the North Pole will be, and vice versa. A computer model based on the current data, showed that for convincing their predictions – the data – is not enough. Need to gather additionally 20 years. This is the best. As a result, French scientists made a disappointing conclusion: inversion can occur. Anytime. Maybe a thousand or so years, as predicted by some of their colleagues. Maybe in two years, how hard predicting others. The words two years is just disturbing. After all, come 2012. The one on which the Maya appointed end. Through his prophetic calendar. On Earth, perhaps, there is not already a person who would not hear of it. Although experts have repeatedly explained that the Maya did not mean disastrous catastrophe, but only the end of a period of time, bad sadomasochism, as they say, remains.

Geomagnetic Leapfrog
Waiting inversion, or reverse, as it is called, at first glance gives fantastic. However, many scientists consider it a real phenomenon. And believe that it has often happened in the history of our planet. Alleged change of poles literally imprinted in ancient rocks. And the lava deposits. The bottom line is that both rock and lava are able to remember the magnitude and direction of the geomagnetic field, which existed at the time of their formation. By studying the different breeds of all ages, scientists who believe in the inversion, created the so-called magneto-chronological scale. And determine in what geological era of the ancient geomagnetic field direction coincides with the modern. And when it was his opposite. If we believe the scale, over a period of 600 million years the Earth has fallen nearly a thousand inversions. And the last – 780 thousand years ago. Clear periodicity in the reversal is not seen. Sometimes, the next coming in a million years after the previous one. And it happened that in 50 thousand years. In other words, the next geomagnetic mess really can happen anytime.

There is no current
One would think, well, what’s so wrong with the inversion. What will be on the North Pole look no blue tip of the compass, and red. In fact, the phenomenon would not be worth the attention and, if there was instantaneous: time – and the poles are reversed. And the field immediately gained former strength. But this guarantee of geophysics not give. On the contrary, are frightening: reversal can be delayed. While it may be a time when the value of the field will fall almost to zero. And it turns off. But turn it over? And how quickly? The reason for the uncertainty is that scientists are still bad are the processes that generate the geomagnetic field. It is believed that the Earth, having a molten iron core, works like a giant dynamo. Nucleus rotates and generates an electric current. This simplified – in theory – form. A real – solid puzzle. – We do not have enough computer memory and processing power to consider all the details of the process – is justified by Gary Glattsmeyer, a specialist in computational physics from the University of California. To clarify the situation at the University of Maryland’s even going to make a model of our planet – the ball with a diameter of 3 meters from the core of 14 tons of molten sodium. Will spin it and see how the field appears and disappears. – We’re going to check in real experiments, the current computer models – the researchers say.

As on Mars. But much faster
Disappearance of the field will automatically lose the Earth’s magnetosphere – the natural barriers that stand in the way of the solar wind and cosmic rays. Life can not long withstand, and the both. By our standards, witnessing the death may be representatives of this generation. If you do not come up like a protective shell, as in one of the film series Highlander. Some scientists believe that the magnetic crash that occurred about a billion years ago, faded Mars. His field, which was just off and on is not on. As a result, it was not just Martians, but also the atmosphere – it blew. However, the Earth faces a much more rapid end. Theoretically, of course. More specifically, once the two ends. One disaster foretold the American Academy of Sciences, which is expected in 2012 a powerful solar flare that can damage power lines throughout the world. But not as deadly as in the movie The Omen, which burned all living things. But can be deadly even the most powerful flash if the planet’s magnetosphere disappears. And defenseless land falls under the plasma emission and the hard radiation of the sun. Once again, remember the phrase two years with regard to polarity reversal, we impose the prophecy of American academics and horrible.

Symptoms Compass scored arrow in Siberia
Scientists who follow the earth’s magnetic field, say: the approaching inversion indicate growing anomaly. First, the geomagnetic field from year to year is weakening. This is a clear sign. Second, the field distort. North Magnetic Pole in 1904 withdrew from their homes. And now moving from the area of ​​Canadian Ellesmere Island to Russia. In Siberia. Is accelerated: starts with 15 miles per year, and has already reached 60. Third, the data from satellites show: homogeneity in the magnetic field of the planet is becoming more and they are larger. Finally, frequent earthquakes – in a very short burst of Haiti, Chile and Turkey. Some scientists have linked increased activity in the bowels of the changes in the Earth’s rotation. But these changes can not affect the operation of the planetary dynamo. Or, conversely, does it generate a tectonic shift.

 
Leave a comment

Posted by on November 30, 2012 in Earth

 

Tags: , , ,

Leave a Reply

Your email address will not be published. Required fields are marked *