Determine the time the magnetic field once reverses

About 41,000 years ago, the Earth's magnetic field was once completely reversed, and if there was a compass at the time, the needle would point south, not north.

Helmholtz Center Potsdam experts - German Geoscience Research Center GFZ - said the most impressive point of the strange phenomenon is the speed of reversal.

The previous magnetic field has been completely reversed - (Photo: GFZ)

Experts Norbert Nowaczyk said that the polarity situation only lasted 440 years, and the magnetic field at that time was not as strong as the current one.

In addition, the polarity process takes place in a 250-year period. In terms of geological time frame, it is very fast, according to R & D.

According to calculations, most of the polar phase reversals of the Earth's magnetic field usually take between 1,000 and 10,000 years.

In the extreme island time 41,000 years ago, the geography field was so weak that it could only maintain about 5% of its current strength.

As a result, the Earth almost lost its entire shield against the continuous bombardment of cosmic radiation, leading to the situation that organisms on Earth were exposed to toxic radiation.