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Earth’s north magnetic pole drifting swiftly

Earth’s north magnetic pole is drifting away from North America and toward Siberia at such a clip that Alaska might lose its spectacular Northern Lights in the next 50 years, scientists said Thursday. The shift could mean Alaska may no longer see the sky lights known as auroras, which might then be more visible in more southerly areas of Siberia and Europe.

The magnetic poles are part of the magnetic field generated by liquid iron in Earth’s core and are different from the geographic poles, the surface points marking the axis of the planet’s rotation.

Scientists have long known that magnetic poles migrate and in rare cases, swap places. Exactly why this happens is a mystery.

Previous studies have shown that the strength of the Earth’s magnetic shield has decreased 10 percent over the past 150 years. During the same period, the north magnetic pole wandered about 685 miles out into the Arctic, according to a new analysis by Stoner.

The rate of the magnetic pole’s movement has increased in the last century compared to fairly steady movement in the previous four centuries, the Oregon researchers said.

The north magnetic pole was first discovered in 1831 and when it was revisited in 1904, explorers found that the pole had moved 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. For example, a compass reading of north in Oregon is about 17 degrees east of geographic north.

posted by: kyawoo at 11:20 | link | comments |
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