Paleomagnetism and the nature of the geodynamo

Details Paleomagnetism and the nature of the geodynamo Paleomagnetism and the nature of the geodynamo

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990sci...248..345m&link_type=abstract

Science (ISSN 0036-8075), vol. 248, April 20, 1990, p. 345-350. Research supported by NSF.

Mathematics

35

Dynamo Theory, Geomagnetism, Paleomagnetism, Planetary Evolution, Magnetic Field Configurations, Magnetic Field Inversions, Magnetic Induction, Mathematical Models

Scientific paper

It is shown how the results of the dynamo theory and the paleomagnetic data can be combined to provide realistic constraints on the nature of geodynamo. Examples are presented which illustrates the contribution that paleomagnetism is making to the understanding of the history and the origin of the earth magnetic field. Such application include investigations of the chronology of magnetic-field polarity reversals for times preceding 100 million years; of polarity transitions and polarity asymmetries; and of the occurrence of magnetic field excursions and secular variations. However, it is shown that, sometimes, interpretations of paleomagnetic data appear to fly in the face of conventional theory, indicating that some of the hypotheses might be inaccurate or in error.

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