A geomagnetic reversal is a change in the orientation of Earth’s magnetic field such that the positions of magnetic north and magnetic south become interchanged. These events often involve an extended decline in field strength followed by a rapid recovery after the new orientation has been established. These events occur on a scale of tens of thousands of years or longer, with the latest one (the Brunhes–Matuyama reversal) occurring 780,000 years ago.
On average geomagnetic reversals occur about every 500,000 years so it would seem that a reversal is overdue. How long a reversal takes and whether a reversal can happen very rapidly is not known. That the earth’s geomagnetic field is due to the flow of liquid metals in the earth’s interior – the dynamo theory – is also very likely. The sun’s magnetic reversals seem to happen at every sunspot maximum with an average period of 11 years between reversals giving a 22 year magnetic cycle.
The movement of Earth's north magnetic pole across the Canadian arctic, 1831--2001. Credit: Geological Survey of Canada.
The position of the magnetic poles is also continuously changing with a current drift (increasing) of the magnetic North Pole from N. Canada towards Siberia at about 40km /year. But this movement may be in some cyclic fashion and is unlikely to be directly connected to the half-million year reversals. For the last 200 years the strength of the earth’s magnetic field has been decreasing and could be the precursor of the overdue reversal.
How the earth will behave during a magnetic reversal is a known unknown and provides the basis of much speculation and cataclysmic theories which cannot be tested. The cataclysmic pole shift hypothesis is one such theory which predicts that the earth’s rotation will reverse, the magnetic field will reverse and mankind will be obliterated – probably in 2012!!
But it is thought that reversals take a few thousand years to complete, and during that time–contrary to popular belief–the magnetic field does not vanish. Magnetic lines of force near Earth’s surface become twisted and tangled, and magnetic poles pop up in unaccustomed places. A south magnetic pole might emerge over Africa, for instance, or a north pole over Tahiti. Weird. But it’s still a planetary magnetic field, and it still protects us from space radiation and solar storms.
Terrence Aym suggests that we may be seeing the beginning of a reversal (and of course since this is overdue it may well occur at any time):
Forget about global warming—man-made or natural—what drives planetary weather patterns is the climate and what drives the climate is the sun’s magnetosphere and its electromagnetic interaction with a planet’s own magnetic field.
Artist's rendition of Earth's magnetosphere: NASA via Wikipedia
Magnetic polar shifts have occurred many times in Earth’s history. It’s happening again now to every planet in the solar system including Earth. The magnetic field drives weather to a significant degree and when that field starts migrating super storms start erupting.
The superstorms have arrived.
The Earth’s northern magnetic pole was moving towards Russia at a rate of about five miles annually. That progression to the East had been happening for decades.
Suddenly, in the past decade the rate sped up. Now the magnetic pole is shifting East at a rate of 40 miles annually, an increase of 800 percent. And it continues to accelerate.
Recently, as the magnetic field fluctuates, NASA has discovered “cracks” in it. This is worrisome as it significantly affects the ionosphere, troposphere wind patterns, and atmospheric moisture. All three things have an effect on the weather.
Worse, what shields the planet from cancer-causing radiation is the magnetic field. It acts as a shield deflecting harmful ultra-violet, X-rays and other life-threatening radiation from bathing the surface of the Earth. With the field weakening and cracks emerging, the death rate from cancer could skyrocket and mutations of DNA can become rampant.
Another federal agency, NOAA, issued a report caused a flurry of panic when they predicted that mammoth superstorms in the future could wipe out most of California. The NOAA scientists said it’s a plausible scenario and would be driven by an “atmospheric river” moving water at the same rate as 50 Mississippi rivers flowing into the Gulf of Mexico……
According to some geologists and scientists, we have left the last interglacial period behind us. Those periods are lengths of time—about 11,500 years—between major Ice Ages. One of the most stunning signs of the approaching Ice Age is what’s happened to the world’s precessional wobble. The Earth’s wobble has stopped. ..
….. So, the start of a new Ice Age is marked by a magnetic pole reversal, increased volcanic activity, larger and more frequent earthquakes, tsunamis, colder winters, superstorms and the halting of the Chandler wobble.
Unfortunately, all of those conditions are being met.
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