An inclined α2ω dynamo

  1. D. E. Smylie and
  2. Raymond Hide
  1. Anthony M. K. Szeto

Published Online: 29 MAR 2013

DOI: 10.1029/GM046p0121

Structure and Dynamics of Earth's Deep Interior

Structure and Dynamics of Earth's Deep Interior

How to Cite

Szeto, A. M. K. (1988) An inclined α2ω dynamo, in Structure and Dynamics of Earth's Deep Interior (eds D. E. Smylie and R. Hide), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM046p0121

Author Information

  1. Department of Earth and Atmospheric Science, York University, North York, Canada M3J 1P3

Publication History

  1. Published Online: 29 MAR 2013
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9780875904504

Online ISBN: 9781118666562



  • Earth—Core—Congresses;
  • Geodynamics—Congresses


A model of the Earth's deep interior has previously been proposed (Szeto & Smylie 1984a,b) where the inner core is inclined to the rest of the Earth. That model is a mechanical one involving no MHD dynamo action. For it to be valid the fluid core must be capable of producing, or maintaining against ohmic decay, a magnetic field which is inclined to the rotation axis of the bulk of the Earth. In this paper we develop a numerical scheme for a kinematic dynamo incorporating two boundaries around the fluid core (namely the core-mantle and inner core-cuter core interfaces), differential rotation at both boundaries, and the α effect. Assumption of a spatially constant α allows a straight forward analysis in terms of spherical Bessel functions, resulting in an eigenvalue problem for the critical magnetic Reynolds number. This work represents the first effort in constructing an α2ω dynamo in a “realistic' geometry, which is an extension of a recent calculation by St Pierre (1987).