The Earth’s magnetic fields helps create a shield that protects us from the continuous onslaught of highly charged space particles and radiation, which are dangerous to creatures living on the Earth’s surface.
So it’s natural that some people would get quite concerned over any news of a weakening or shifting of the magnetic fields.
Over the last several years there have been studies that suggest Earth’s magnetic field has been weakening at a rate around 10 times faster than originally thought or approximately 5 percent of its strength every decade.
Some scientists argue that the weakening of Earth’s magnetic fields is due to an upcoming flip in polarity.
In other words, the magnetic North Pole would become the South Pole and vice versa.
Earth’s magnetic fields have flipped seveal times throughout its 4.5 billion year history.
A study conducted in 2014 by an international team of scientists found that planet Earth is on the verge of magnetic field reversal. They said the last time this happened was about 786,000 years ago, taking about 100 years to do so — a relatively short time.
Scientists say, on average, the reversal of Earth’s magnetic fields take place roughly every 250,000 years, although the periods between periods field flips can vary.
Usually the magnetic fields remain steady and at the same intensity for thousands or millions of years, but for reasons that scientists can’t explain, the field weakens and then flips direction over a period of about a couple thousand years.
Scientists believe that magnetic field reversals are driven by changes in the Earth’s iron/nickel core.
Now, calculations made in a new study led by mathematician Matthias Morzfeld at the University of Arizona, suggests “with high confidence,” that we can relax for 4,000 years, which is when Morzfeld’s team predicts the next magnetic flip will take place.
The study, published in the journal Physics of Earth and Planetary Interiors, drew upon paleomagnetic data recorded in rocks over the past 2 million years, as well as other sources, such as several centuries’ worth of measurements taken by ships.
With the data, Morzfield and his colleagues created a mathematical framework and computer models that precisely forecast all the magnetic field reversals over that 2-million-year period. Doing this, the researchers say, they were able to make accurate predictions of future reversals.
If we could be around in 4,000 years when the predicted magnetic field reversal occurs, Morzfield expects we’d see the field become very weak.
“But nobody knows what would happen next. It’s possible that the field just changes shape and goes from the dipole [two poles] into the quadrupole [four pole] configuration, said Morzfield in a University of Arizona press release.
He also warned that the magnetic fields could completely collapse, which would be really bad, since our planet would be exposed to the things the fields currently protect us from.
“On the other hand, field reversals have happened, and life on Earth has survived,” said Morzfield.