Secular variation and the origin of geomagnetic field reversals

Details Secular variation and the origin of geomagnetic field reversals Secular variation and the origin of geomagnetic field reversals

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9311589m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Oct. 10, 1988, p. 11589-11597. NSF-supported research.

Physics

33

Geomagnetism, Magnetic Field Inversions, Polarity, Secular Variations, Dynamo Theory, Magnetic Dipoles, Quadrupoles, Reversing

Scientific paper

Although there has been growing interest in suggestions that geomagnetic reversals may be initiated by external sources, it is shown that the present evidence favors a mechanism of internal origin for at least the vast majority of reversals. Several lines of evidence indicate that the dipole and quadrupole dynamo families are decoupled most of the time, but are coupled across polarity transitions. This suggests a reversal model in which reversals are initited when the quadrupole family couples critically with the dipole family.

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