Transition fields during geomagnetic reversals and their geodynamic significance.

Details Transition fields during geomagnetic reversals and their geodynamic significance. Transition fields during geomagnetic reversals and their geodynamic significance.

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997rspta.355.1713h&link_type=abstract

Philos. Trans. R. Soc. Lond. A, Math. Phys. Eng. Sci., Vol. 355, No. 1730, p. 1713 - 1742

Physics

4

Geomagnetic Field: Reversals

Scientific paper

The paths of virtual geomagnetic poles (VGPs), which are north magnetic poles conventionally calculated from the axial dipole formula, describing the transitional fields during Cenozoic polarity reversals, are presented. They provide evidence that, at least on a number of occasions, the transitional field recorded by sediments is predominantly dipolar. The VGP paths are mostly confined to two longitudinal sectors which are 180° apart. A much smaller number of records show that for certain reversals, a path midway between the two preferred paths is favoured. Two hypotheses to explain these observations have been put forward. The first hypothesis notes that the preferred paths correlate roughly with two seismic tomography anomalies in the lower mantle that have been interpreted as lateral temperature anomalies associated with mantle convection. It is then suggested that the diffusion of these thermal anomalies somehow controls the core dynamo and its mode of reversal. The alternate view simply accepts the concept that the dynamo reverses by dipole rotation and that the D″layer is hemispherically asymmetric chemically. The data presented on transitional polar paths should provide a test between the two theories.

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