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Geophys. J. Int. (2010) doi: 10.1111/j.1365-246X.2010.04842.x GJIGeomagnetism,rockmagnetismandpalaeomagnetism
 

Summary: Geophys. J. Int. (2010) doi: 10.1111/j.1365-246X.2010.04842.x
GJIGeomagnetism,rockmagnetismandpalaeomagnetism
Steady and fluctuating inner core rotation in numerical
geodynamo models
Julien Aubert1
and Mathieu Dumberry2
1Dynamique des Fluides G´eologiques, Institut de Physique du Globe de Paris, Universit´e Paris-Diderot, INSU/CNRS, 1, rue Jussieu, 75238,
Paris Cedex 05, France. E-mail: aubert@ipgp.fr
2Department of Physics, University of Alberta, Edmonton, AB, T6G 2G7, Canada
Accepted 2010 October 5. Received 2010 September 6; in original form 2010 June 4
S U M M A R Y
We present a systematic survey of numerical geodynamo simulations where the inner core
is allowed to differentially rotate in the longitudinal direction with respect to the mantle.
We focus on the long-term behaviour of inner core rotation, on timescales much longer than
the overturn time of the fluid outer core, including the steady component of rotation. The
inner core is subject to viscous and magnetic torques exerted by the fluid outer core, and a
gravitational restoring torque exerted by the mantle. We show that the rate of steady inner core
rotation is limited by the differential rotation between spherical surfaces that the convective
dynamics can sustain across the fluid outer core. We further show that this differential rotation
is determined by a torque balance between the resistive Lorentz force and the Coriolis force on

  

Source: Aubert, Julien - Institut de Physique du Globe de Paris

 

Collections: Geosciences