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On the Generation of Magnetic Fields in the Solar Nebula at the Location of the Present-Day Asteroid Belt

The nebular dynamo hypothesis was originally presented [I] to account for measured meteoritic magnetic remanence. Since then calculations carried out for the nebular dynamo [2,3,4] showed that dynamo regeneration is plausible everywhere in the nebula except possibly in the region between approximately 2 A.U. and 5 A.U, near the midplane, where the gas temperature is too low for thermal ionization to take place and the surface density is too high for cosmic rays to sufficiently ionize the equatorial regions of the nebula. Ironically, this region coincides with the asteroid belt from which meteorites are believed to originate. Recently, we have reexamined the operation of a dynamo process in the solar nebula a t the location of the asteroid belt.