During polarity flips it can be anywhere but you have to really well define your terms as to what you count as a pole. I don’t think the exact mechanics of the

During polarity flips it can be anywhere but you have to really well define your terms as to what you count as a pole. I don’t think the exact mechanics of the magnetic field are super certain, but the general idea is that the rotation sort of pins the poles nearish to the axis but there’s been some significant variation historically.