Re: OT: explain this

On Jan 6, 12:47 am, dewachen1...@xxxxxxxxx wrote:
On Jan 5, 10:55 am, doug <hogrid...@xxxxxxxxxxx> wrote:

OK: all you global warming nuts explain this.  Its cold here I could
use a little global warming about now.

http://www.dailytech.com/Article.aspx?newsid=13834

Here is the real cause of globe warming.

The North Pole is on the move. Scientists have found large holes
appearing in the Earth's magnetic field, suggesting the north and
south poles are preparing to reverse positions in a magnetic flip.

A period of chaos could be imminent when compasses no longer point
north, migrating animals head in the wrong direction and satellites
are burnt up by solar radiation.

The holes lie over the south Atlantic and the Arctic. The changes were
revealed after detailed data from the Danish Orsted satellite was
analysed. Results were compared with data from earlier satellites.

The speed of the change has surprised scientists. Nils Olsen, of the
Centre for Planetary Science in Denmark, one of several centres
analysing the data, said the Earth's core appeared to be undergoing
dramatic changes. He added: "This could be the state in which the
Earth's geodynamo operates before reversing."

The geodynamo is the way the magnetic field is generated: by currents
of molten iron flowing around a solid core. Sometimes giant vortices
form in the liquid metal and they can change or even reverse the
magnetic fields above them. Olsen's team believes vortices have formed
beneath the North Pole and south Atlantic. If they become powerful
enough they could reverse all the other currents, causing the north
and south poles to switch places.

Andy Jackson, a specialist in geomagnetism at Leeds University, said a
change was long overdue: "Such flips normally happen every 500,000
years, but it has been 750,000 years since the last one."
The change could affect humans and wildlife.
The magnetosphere gives vital protection against searing solar
radiation that would otherwise sterilise Earth.

Although the magnetic field would probably not disappear altogether,
it may weaken while the poles switch. The resulting surge in radiation
could cause cancers, reduce crops and confuse migrating animals,
including whales and pigeons.

From the Sunday Times

I don't understand how the flipping of the magnetic poles would
contribute to global warming, which I thought was due to an excess of
greenhouse gasses.

I am very familiar with pole flipping - as an undergrad physics major
I took a geophysics class. We wrote computer models to analyze the
magnetic domains from deep sea core samples. Magma produced at the mid-
oceanic ridges capture the orientation of the earth's magnetic field
as they are cooled. As you take samples across the ocean away from the
ridges you can read the history of the orientation of the earth's
magnetic field. Cool stuff.

John L.
.

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