The field can even change polarity completely, with the magnetic north and south poles switching places. Now Gauthier Hulot from the Institute of Earth Sciences in Paris and his colleagues think they have spotted early signs of another reversal. THE doomsday planet Nibiru, or Planet X, will reverse the Earthâs magnetic poles and ravage the planet beyond recognition when it passes in the near future, a â¦ Research into these magnetic reversal events has come through analysis and measurement of the magnetic fields of rock that are located on the surface and within Earth's crust. A geomagnetic pole reversal is the shifting of the magnetic north pole to the magnetic south pole and vice versa. Scientists who track the history of the planet have identified 74 of these events by studying core samples. Between South America and southern Africa, there is an enigmatic magnetic region called the South Atlantic Anomaly, where the field is a lot weaker than we would expect. So if it happened, the protection method would probably be to wear a big floppy hat.â The movement of the Earth's magnetic poles are shown in this animation at 10-year intervals from 1970 to 2020. A reversal happens over hundreds or thousands of years, and it is not exactly a clean backflip. A pole reversal, when the earthâs north and south magnetic poles start to swap places, reversing the worldâs magnetic polarity, has happened before. The full magnetic polarity reversal â that is, the final and very rapid flip to what the field is today â happened toward the end of the most recent interval of low field strength. Pole Reversal evidence is clearly shown in NOAAâs new data from the National Geophysical Data Center, named âEMAG2â Earth Magnetic Anomaly Grid (2-arc-minute resolution). Changes in direction of the magnetic field of the Earth and evidence to support it. Discover how and why Earth's magnetic poles reverse positions and what the next reversal might mean for life on Earth. This is called a reversal and last happened 780,000 years ago. You may wonder how scientists are estimating the changes in the magnetic field, which happened a million years ago. They do not appear to cause disruptions to life on the earth, but if the next occurs soon, it would â¦ Magnetic Field Reversal. Since geomagnetic reversal takes a number of thousands of years, they could well adapt to the changing magnetic environment or develop different methods of navigation. This catastrophic pole shift would neutralise our protection against sunâs radiation, the Earthâs magnetic field, for around 200 years. The magnetic field reversal (pole reversal) is estimated to be happening a few times every million years. % Magnetic fields morph and push and pull at one another, with multiple poles emerging at odd latitudes throughout the process. Magnetic reversals have happened hundreds of times. The last reversal happened about 780,000 years ago, over a period of several thousand years. There are many theories as to the frequency of the shifts in magnetic poles which range anywhere from 10,000 years to almost 800,000 years. Scientists estimate reversals have happened at least hundreds of times over the past three billion years.