Three branches of dynamo action

In addition to the weak-dipolar state and to the fluctuating-multipolar state, widely discussed in the literature, a third regime has been identified in (Dormy 2016 J. Fluid. Mech. 789 500-13). It corresponds to a strong-dipolar branch which appears to approach, in a numerically affordable regime, t...

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Published inFluid dynamics research Vol. 50; no. 1; pp. 11415 - 11432
Main Authors Dormy, Emmanuel, Oruba, Ludivine, Petitdemange, Ludovic
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.02.2018
Subjects
Astrophysics
dynamo action
dynamo bifurcation
Earth Sciences
Geophysics
magnetostrophic balance
Physics
Sciences of the Universe
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Summary:In addition to the weak-dipolar state and to the fluctuating-multipolar state, widely discussed in the literature, a third regime has been identified in (Dormy 2016 J. Fluid. Mech. 789 500-13). It corresponds to a strong-dipolar branch which appears to approach, in a numerically affordable regime, the magnetostrophic limit relevant to the dynamics of the Earth's core. We discuss the transitions between these states and point to the relevance of this strong-dipolar state to Geodynamo modelling.
Bibliography:FDR-100212.R1
The Japan Society of Fluid Mechanics
ISSN:0169-5983
1873-7005
DOI:10.1088/1873-7005/aa769c