Bottom-up control of geomagnetic secular variation by the Earth’s inner core

Julien Aubert (), Christopher C. Finlay and Alexandre Fournier
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Julien Aubert: Dynamique des Fluides Géologiques, Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, F-75005 Paris, France
Christopher C. Finlay: National Space Institute, Technical University of Denmark, Elektrovej, 2800 Kongens Lyngby, Denmark
Alexandre Fournier: Géomagnétisme, Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, F-75005 Paris, France

Nature, 2013, vol. 502, issue 7470, 219-223

Abstract: The pattern of geomagnetic secular variation observed on the Earth’s surface is shown to be reproduced by two mechanisms relying on the inner core; this bottom-up heterogeneous driving of outer-core convection dominates top-down driving from mantle thermal heterogeneities.

Date: 2013
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DOI: 10.1038/nature12574

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