In 2015, a solar storm cracked Earth’s magnetic field. The storm shrunk the magnetic field to about 1/3 its normal size and briefly caused a crack that let in a lot of cosmic radiation. Luckily, little damage was done because the field repaired itself within a few hours. Source
The more I learn about magnetism the less I understand it
Welcome to science.
That’s basically it though. There are three things physicists are at a loss to explain:
Water
Dark Matter/Energy
Magnets