Behavior of the geodynamo during reversal - A phenomenological model

Details Behavior of the geodynamo during reversal - A phenomenological model Behavior of the geodynamo during reversal - A phenomenological model

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..44....7h&link_type=abstract

Earth and Planetary Science Letters, vol. 44, no. 1, July 1979, p. 7-17. Research supported by the University of Minnesota and

Computer Science

19

Dynamo Theory, Geomagnetism, Magnetic Field Inversions, Phenomenology, Graphs (Charts), Magnetic Dipoles, Northern Hemisphere, Paleomagnetism, Polarity, Time Dependence

Scientific paper

A model is presented which interprets observed transitional behavior of the geomagnetic field to be reflective of a reversal process which begins in a localized region of the core. Azimuthal as well as latitudinal extension (or 'flooding') of reversed flux is then assumed to continue until the entire magnetic source region has been affected. Comparison with the paleomagnetic records corresponding to the Matuyama-Brunhes transition presently available from five site localities scattered about the northern hemisphere indicates that the model can successfully simulate global time-dependent variation in the reversing geomagnetic vector field. For low- and mid-latitude sites, predicted behavior during transitions is found to be compatible with that outlined earlier for the case of axisymmetric flooding. The model also successfully accounts for the high degree of dispersion among paths of the virtual geomagnetic pole (VGP) associated with Icelandic data. Comparison of VGP paths corresponding to four Cenozoic transitions recorded in the western United States suggests that there may exist a small number of discrete sites in the core at which reversals originate. It is not as yet clear whether these findings lend support to any particular kinematic or hydromagnetic model of the geodynamo.

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