What causes the magnetic fields to reverse?
To answer this one, we must rely on the theory of relativity. Electrons on the surface of the earth have no relative velocity to a man on the surface of the earth as the earth rotates. The normal field is due to electrons and as they move outward the normal field will decrease and if they move inward then the normal field will increase because of relativity. Therefore the reversal of earths magnetic field will be controlled by the inward or outward motion of the spherical shell of electron. At the present time this shell of electrons are moving outward. 5. When will the magnetic field reverse from normal to reverse? It is believed by the author that a reversal is immanent because of magnetic mapping done in 1980 and again in 2000. There was a significant increase in the reverse field in the year 2000 over the year 1980; also the normal field is decreasing. The change will be gradual and will depend on the interior heat of the earth; we should expect an increase in global warming for th
