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North Magnetic Pole Moving Due to Core Flux

 
Tols
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01/15/2010 10:29 AM
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North Magnetic Pole Moving Due to Core Flux
North Magnetic Pole Moving Due to Core Flux

[link to news.nationalgeographic.com]


National Geographic Daily News
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Blue lines show Earth's northern magnetic field and the magnetic north pole in an artist's rendering.

Picture courtesy Stefan Maus, NOAA NGDC
Richard A. Lovett in San Francisco

for National Geographic News

December 24, 2009

Earth's north magnetic pole is racing toward Russia at almost 40 miles (64 kilometers) a year due to magnetic changes in the planet's core, new research says.

The core is too deep for scientists to directly detect its magnetic field. But researchers can infer the field's movements by tracking how Earth's magnetic field has been changing at the surface and in space.

Now, newly analyzed data suggest that there's a region of rapidly changing magnetism on the core's surface, possibly being created by a mysterious "plume" of magnetism arising from deeper in the core.

And it's this region that could be pulling the magnetic pole away from its long-time location in northern Canada, said Arnaud Chulliat, a geophysicist at the Institut de Physique du Globe de Paris in France.

Finding North

Magnetic north, which is the place where compass needles actually point, is near but not exactly in the same place as the geographic North Pole. Right now, magnetic north is close to Canada's Ellesmere Island.

Navigators have used magnetic north for centuries to orient themselves when they're far from recognizable landmarks.

Although global positioning systems have largely replaced such traditional techniques, many people still find compasses useful for getting around underwater and underground where GPS satellites can't communicate.

The magnetic north pole had moved little from the time scientists first located it in 1831. Then in 1904, the pole began shifting northeastward at a steady pace of about 9 miles (15 kilometers) a year.

In 1989 it sped up again, and in 2007 scientists confirmed that the pole is now galloping toward Siberia at 34 to 37 miles (55 to 60 kilometers) a year.

A rapidly shifting magnetic pole means that magnetic-field maps need to be updated more often to allow compass users to make the crucial adjustment from magnetic north to true North.

Wandering Pole

Geologists think Earth has a magnetic field because the core is made up of a solid iron center surrounded by rapidly spinning liquid metal. This creates a "dynamo" that drives our magnetic field.

(Get more facts about Earth's insides.)

Scientists had long suspected that, since the molten core is constantly moving, changes in its magnetism might be affecting the surface location of magnetic north.

Although the new research seems to back up this idea, Chulliat is not ready to say whether magnetic north will eventually cross into Russia.

"It's too difficult to forecast," Chulliat said.

Also, nobody knows when another change in the core might pop up elsewhere, sending magnetic north wandering in a new direction.

Chulliat presented his work this week at a meeting of the American Geophysical Union in San Francisco.

RELATED

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American Geophysical UnionInstitut de Physique du Globe de Paris
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Tols (OP)

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01/15/2010 10:29 AM
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Re: North Magnetic Pole Moving Due to Core Flux
Do not know if this was posted before, if so my apologies :)
"If Tyranny and Oppression come to this land, it will be in the guise of fighting a foreign enemy"- James Madison

"Joining the military does not mean that you will be defending the country. The purpose of the U.S. military should be to defend the United States. Period. Yet, one of the greatest myths ever invented is that the current U.S. military somehow defends our freedoms. First of all, our freedoms are not in danger of being taken away by foreign countries; if they are taken away it will be by our own government. It is not a country making war on us that we need to fear, it is our government making war on the Bill of Rights. And second, how is stationing troops in 150 different regions of the world on hundreds of U.S. military bases defending our freedoms? It is not the purpose of the U.S. military to change regimes, secure the borders of other countries, or spread democracy at gunpoint. The Department of Defense should first and foremost be the Department of Homeland Security."--Laurence Vance--
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01/15/2010 10:38 AM
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Re: North Magnetic Pole Moving Due to Core Flux
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