Doesn't it depend on what creates the magnetic field ?
The magnetic poles move all the time. According to the data, they keep moving further away from the geographic poles.
Let's say they were fixed and couldn't move. How would they suddenly 'change' polarity ? What would be the mechanism that would explain that ?
I read a while ago that the north magnetic pole has been moving more rapidly in recent decades. Could that be leading up to a flip? Someone suggested that they flip at roughly 60,000 intervals. Anyone know if this is right? Also, when was the last time they flipped? I think the author is confusing fallow fields with consequences that follow.