2012 Magnetic Pole Reversal

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Earth Wobbles linked to extinctions! LONDON, England (Reuters) -- Wobbles or variations in the Earth's orbit and tilt are associated with extinctions of rodent and mammalian species, Dutch scientists said on Wednesday. They studied rodent fossil records in central Spain dating back 22

million years and found that the rise and fall of mammal species was linked to changes in the Earth's behavior which caused cooling periods. "Extinctions in rodent species occur in pulses which are spaced by intervals controlled by astronomical variations and their effects on climate change," Dr Jan van Dam, of the Utrecht University in the Netherlands, said. The researchers found two cycles corresponding to the disappearance of rodent species. One lasts 2.4 million years and is linked to variations in the Earth's orbit. The other is a 1.2 million year cycle relating to shifts in the tilt on the Earth on its axis. Details...

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Magnet Pole Drifting The Earth's north magnetic pole is drifting away from North America so fast that it could end up in Siberia within 50 years, scientists have said. The shift could mean that Alaska will lose its northern lights, or auroras, which might then be more visible in areas of Siberia and Europe. The magnetic poles are different from geographic poles, the surface points marking the axis of Earth's rotation. Magnetic poles are known to migrate and, occasionally, swap places.

"This may be part of a normal oscillation and it will eventually migrate back toward Canada," Joseph Stoner, a palaeomagnetist at Oregon State University, told a meeting of the American Geophysical Union (AGU) in San Francisco. Wandering poles Previous studies have shown that the strength of the Earth's magnetic shield has decreased 10% over the past 150 years. During the same period, the north magnetic pole wandered about 1,100km (685 miles) into the Arctic, according to the new analysis. The rate of the magnetic pole's movement has increased in the last century compared with fairly steady movement in the previous four centuries, the Oregon researchers said. The Oregon team examined the sediment record from several Arctic lakes. Since the sediments record the Earth's magnetic field at the time, scientists used carbon dating to track changes in the magnetic field. They found that the north magnetic field shifted significantly in the last thousand years. It generally migrated between northern Canada and Siberia, but has occasionally moved in other directions. Rate of change At the present rate, the north magnetic pole could swing out of northern Canada into Siberia. If that happens, Alaska could lose its northern lights, or auroras, which occur when charged particles streaming away from the Sun collide with gases in the ionosphere, causing them to glow. The north magnetic pole was first discovered in 1831 and when it was revisited in 1904, explorers found it had moved by 50km (31 miles). For centuries, navigators using compasses had to learn to deal with the difference between magnetic and geographic north. A compass needle points to the north magnetic pole, not the geographic North Pole. 2012, Mayan Calender, Mayan Calendar, Pole Shift, Pole Reversal, Details...