Abstract
An examination is made of J. S. Chatterjee's recent suggestion that the earth's magnetic field has been gradually built up by magnetic storms which induce unidirectional current in the highly conducting core because the semiconducting mantle acts as a rectifier. It is shown that, even if rectification of current in the mantle does occur, it is most unlikely that magnetic storms or other transient variations have any lasting effect on the earth's main field. Some comments are made on Chatterjee's arguments and on a note by T. Rikitake.
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