What happens when the earth’s magnetic field flips?

What happens when the earth’s magnetic field flips?A paper published in the journal “Science” showed that the Earth’s most recent geomagnetic deflection occurred between 41,000 and 42,000 years ago. At that time, the strength of the Earth’s magnetic field was reduced to 6% of its current level, and the entire Earth was exposed to the erosion of solar wind and cosmic rays. under;