Has Magnetic Pole Reversals?

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. ... In the past 200 years, Earth's magnetic field has weakened about nine percent on a global average.

When was the last magnetic pole reversal?

Sometimes, for reasons scientists do not fully understand, the magnetic field becomes unstable and its north and south poles can flip. The last major reversal, though it was short-lived, happened around 42,000 years ago.

How often do magnetic pole reversals happen?

These reversals are random with no apparent periodicity to their occurrence. They can happen as often as every 10 thousand years or so and as infrequently as every 50 million years or more. The last reversal was about 780,000 years ago.