Strong- field dynamo models for the Geodynamo

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• Emmanuel Dormy (ENS Paris)
• Monday 06 February 2017, 16:00-17:00
• MR14, Centre for Mathematical Sciences, Wilberforce Road, Cambridge.

If you have a question about this talk, please contact Robert Teed.

Numerical models of the geodynamo are usually classified into two categories: dipolar modes, observed when the inertial term is small enough; and multipolar fluctuating dynamos, for stronger forcing. I have recently shown that a third dynamo branch corresponding to a dominant force balance between the Coriolis force and the Lorentz force can be produced numerically. This regime 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. I will discuss the relevance to this strong-dipolar state to Geodynamo modelling.

This talk is part of the DAMTP Astrophysics Seminars series.

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• MR14, Centre for Mathematical Sciences, Wilberforce Road, Cambridge
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