Toroidal flux oscillation as possible cause of geomagnetic excursions and reversals

Details Toroidal flux oscillation as possible cause of geomagnetic excursions and reversals Toroidal flux oscillation as possible cause of geomagnetic excursions and reversals

2009-04-06

arxiv.org/abs/0904.1031v1

Physics of the Earth and Planetary Interiors, 168, (3-4), 237-243, 2008

Physics

Fluid Dynamics

Published in PEPI

Scientific paper

10.1016/j.pepi.2008.06.007

It is proposed that convection driven dynamos operating in planetary cores could be oscillatory even when the oscillations are not directly noticeable from the outside. Examples of dynamo simulations are pointed out that exhibit oscillations in the structure of the azimuthally averaged toroidal magnetic flux while the mean poloidal field shows only variations in its amplitude. In the case of the geomagnetic field, global excursions may be associated with these oscillations. Long period dynamo simulations indicate that the oscillations may cause reversals once in a while. No special attempt has been made to use most realistic parameter values. Nevertheless some similarities between the simulations and the paleomagnetic record can be pointed out.

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