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Strong- field dynamo models for the Geodynamo

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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 Astro Mondays series.

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