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Z .Physics of the Earth and Planetary Interiors 112 1999 159170 Can heterogeneous coremantle electromagnetic coupling control

Summary: Z .Physics of the Earth and Planetary Interiors 112 1999 159­170
Can heterogeneous core­mantle electromagnetic coupling control
geomagnetic reversals?
Daniel Brito)
, Jonathan Aurnou, Peter Olson
Johns Hopkins UniÕersity Baltimore, MD 21218-2681, USA
Received 12 June 1998; received in revised form 3 November 1998; accepted 4 November 1998
An analytical model is developed for the electromagnetic torques exerted on the mantle by the poloidal magnetic field of
the core interacting with a laterally heterogeneous conducting layer at the base of the mantle. Torques due to changes in both
orientation and intensity of a dipolar poloidal field are included. Contrary to earlier suggestions, our calculations predict that
the trajectory of the magnetic pole during a polarity reversal is not strongly affected by heterogeneity in mantle electrical
conductivity. q 1999 Elsevier Science B.V. All rights reserved.
Keywords: Geomagnetic field; Polarity Reversals; Core­mantle coupling; Electromagnetic torques; D
1. Introduction
The behavior of the geomagnetic field during
polarity reversals is critical for understanding the
geodynamo and the coupling between the core and


Source: Aurnou, Jonathan - Department of Earth and Space Sciences, University of California at Los Angeles
Brito, Daniel - Laboratoire de Géophysique Interne et Tectonophysique, Observatoire de Grenoble, Université Joseph Fourier


Collections: Geosciences