Here is a fascinating and compelling theory about how the geomagnetic field is generated. This distinguished scientist, J.Marvin Herndon has spent many years developing and exploring the theory. If he is right, then it is one of the greatest discoveries in geo-science. If he is wrong, then it shows how a theory can be almost perfect and yet be wrong. Either way, this is a very interesting idea, and process of theory developement.
According to Herndon, Helium 3 is emitted by volcanoes as predicted by his theory. However, Anti-neutrinos, a by-product of fission and reactors were detected in Japan, but not in Italy, not at a flux level, or density that would correspond with a fission reactor (at the center of the earth).
(c) Paul C Adams 2014