A new study indicates that there is a possible connection between the Earth's inner core and a magnetic reversal.
The magnetic field reverses direction every few thousand years. If it happened now, we would be exposed to solar winds capable of knocking out global
communications and power grids.
Peter Olson and Renaud Deguen of Johns Hopkins University in Baltimore, Maryland, used numerical modelling to
establish that the axis of Earth's magnetic field lies in the growing hemisphere. While one side of Earth's
solid inner core grows slightly, the other half melts, the scientists concluded in their research paper.
Now the researchers speculate that there are signs that the next magnetic pole reversal may be underway.
The rapid movements of the field's axis to the east in the last few hundred years could be a precursor
to the north and south poles trading places, the researchers suggest.
Rapid Decrease of the Dipole Moment (Credit: P.Olson/JHU)
"What we found that is interesting in our models is a correlation between these transient [shifts] and reversals [of Earth's magnetic field]," says Olson.
"We kind of speculate there is that connection but the chaos in the core is going to prevent us from making accurate predictions for a long time."
Bruce Buffett of the University of California, Berkeley, says the authors present an intriguing proof of concept with their model.
"They are suggesting very cautiously that maybe this rapid change is somehow suggestive of us going into a reversal event," he says.
"You could imagine if the field were to collapse it would have disastrous consequences for communication systems and power grids."
How Much Should We Fear Incoming Solar Activity?
According to NASA, it is a mistake to assume that a pole reversal would momentarily leave Earth without the magnetic field that protects us from
solar flares and coronal mass ejections from the sun. But, while Earth's magnetic field can indeed weaken and strengthen over time, there is no
indication that it has ever disappeared completely.
A weaker field would certainly lead to a small increase in
solar radiation on Earth - as well as a beautiful display of aurora at lower latitudes -- but nothing deadly. Moreover, even with a
weakened magnetic field, Earth's thick atmosphere also offers protection against the sun's incoming particles.
Movement of Earth's North Magnetic Pole Accelerating Rapidly
After some 400 years of relative stability, Earth's North Magnetic Pole has moved nearly 1,100 kilometers out into the Arctic Ocean during the last
century and at its present rate could move from northern Canada to Siberia within the next half-century.
Northern Lights as seen from space. Image credit: NASA
If that happens, Alaska may be in danger of losing one of its most stunning natural phenomena - the Northern Lights.
However, rapid movement of the magnetic pole doesn't necessarily mean that our planet is going through a large-scale change that would result in the reversal
of the Earth's magnetic field. It may also be part of a normal oscillation. Calculations of the North Magnetic Pole's location from historical records goes
back only about 400 years, while polar observations trace back to John Ross in 1838 at the west coast of Boothia Peninsula.
No Reason To Panic
Earth's magnetic field has flipped its polarity many times over the millennia and reversals are the rule, not the exception.
A schematic diagram of Earth's interior and the movement of magnetic north from 1900 to 1996. The outer core is the source of the geomagnetic field.
Graphic Credit: Dixon Rohr
A magnetic pole reversal does not happen overnight.
Earth has settled in the last 20 million years into a pattern of a pole reversal about every 200,000 to 300,000 years, although it has been more than twice that
long since the last reversal. A reversal happens over hundreds or thousands of year, and not over night.
This means a magnetic pole reversal is not a sign of doomsday.
MessageToEagle.com based on information provided by NASA, New Scientist
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