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Over the last 200 years, it’s been slowly weakening and shifting its magnetic north pole (where a compass points, not to be confused with the geographic north pole) from the Canadian Arctic...
These small-scale deviations in the magnetic field can actually lead to changes in the large-scale field over time and potentially even a complete reversal of the polarity of the dipole field, where the north becomes south and vice versa.
Can the South Pole Anomaly provide a clue to what might happen during a geomagnetic reversal? The SAA is concerning because the weakened magnetic field makes life difficult for satellites.
During a pole reversal, Earth’s magnetic north and south poles swap locations. While that may sound like a big deal, pole reversals are common in Earth’s geologic history. Paleomagnetic records tell us Earth’s magnetic poles have reversed 183 times in the last 83 million years, and at least several hundred times in the past 160 million years.
Earth's magnetic north and south poles switch at irregular intervals at an average of every 200,000 years or so, and the event could have a dramatic effect on the environment and technology.
They also found that the north magnetic pole is especially turbulent and unpredictable. If the magnetic blocks become strong enough to sufficiently weaken the dipole, the poles will...
Though the Earth’s magnetic field is very similar to that of a bar magnet, with a north and south pole, it is not as stable because it is generated by complex processes inside the Earth. These cause the magnetic poles to wander. Historically, the North Pole has moved at about 15 kilometres per year.
NCEI scientists with the Cooperative Institute for Research in Environmental Sciences (CIRES) at the University of Colorado Boulder calculated the movement of both the North and South Magnetic Poles from 1590 to 2025 using two models: gufm1 and IGRF.
Could we be on the brink of a geomagnetic reversal, in which the magnetic north and south poles swap places? Earth’s magnetic field is generated by the convection of molten iron in the planet’s core, around 1,800 miles beneath our feet.
It is what is called a dipole field--with a north and south pole. But occasionally this dipole field switches polarity--north and south reverse--and this process seems to take a few thousand...