Geomagnetic field reversals, obs and model

Talk: A Brownian model for the temporal asymmetry of the Earth's magnetic field reversals


The geodynamo, the process that produces and controls the evolution of the Earth’s magnetic field, is still not fully understood. Despite the success of current numerical geodynamo models in reproducing some geomagnetic observations, their high complexity and computational requirements hinder their use for certain studies. In this talk I will present a simple model based on random fluctuations that is able to reproduce the temporal asymmetry of the dipolar strength of the field observed during polarity reversals. This behavior arises due to the existence of two parts of the model that are at different temperatures, imposing a preferred direction of energy transfer and an arrow of time, and we propose that a similar mechanism could give rise to the temporal asymmetry of the geodynamo.

Gulliver Seminar, ESPCI (Paris)

Authors: A. Molina Cardin, L. Dinis , M.L. Osete