Reversals of the Earth's field (4 queries) . ... The Sun's magnetic poles . ... Magnetic field lines . ... Also, if you look up "Exploration of the Earth's Magnetosphere" you will see that the reason the Earth has a magnetic field is not any polarization, but electric currents flowing in the Earth's core. ... I hope you are aware that this is only one part in a much larger exposition, the Exploration of the Earth's Magnetosphere, dealing with the Earth's magnetic environment, with its home page at . ...