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Erschienen in:
2007 | OriginalPaper | Buchkapitel
How MHD Transformed the Theory of Geomagnetism
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The main magnetic field on the Earth is generated by, and has been maintained throughout Earth’s history by, a fluid dynamo operating in the Earth’s electrically conducting core. The author gives his personal view of how understanding of this ‘geodynamo’ grew during his lifetime, and he includes recollections of some of the scientists involved. The remarkable evolution of the subject from simple applications of electromagnetic theory to today’s sophisticated magnetohydrodynamic theory is outlined. The importance of Coriolis forces in core MHD is not fully appreciated even today, but it transforms MHD into an essentially different subject that is briefly reviewed here. Proposals are made to give it its own special name.