EGU2020-19012
https://doi.org/10.5194/egusphere-egu2020-19012
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Simplified model for axial dipole moment of the geomagnetic field from Brownian fluctuations

Alberto Molina Cardín1,2, Luis Dinis Vizcaíno3, and María Luisa Osete López1,2
Alberto Molina Cardín et al.
  • 1Department of Physics of the Earth and Astrophysics, Complutense University of Madrid, Madrid, Spain.
  • 2Geosciences Institute IGEO (CSIC-UCM), Madrid, Spain.
  • 3Complex Systems Interdisciplinary Group (GISC), Madrid, Spain

The magnetic field of the Earth is generated in its core by the process called the geodynamo, which involves convection in the fluid and electrical conducting outer core. The evolution of this complex process is simulated by magnetohydrodynamic models, which provide the state of the core and the magnetic field at any point and any time of the simulation. Nevertheless, the complexity of these models implies a high computational cost. That is why conceptual simple models describing only the main mechanisms from a statistical perspective can also be useful.

In this work we present a conceptual model that reproduces the main features of the axial dipole moment (ADM) of the Earth magnetic field. It is based on the stochastic dynamics of two Brownian particles interacting with each other within a double-well potential. The obtained simulations are able to mimic the random temporal distribution of reversals and excursions and the asymmetric temporal evolution of ADM during reversals. The relation between the model features and the real mechanisms that lead to the observed behaviour is discussed.

How to cite: Molina Cardín, A., Dinis Vizcaíno, L., and Osete López, M. L.: Simplified model for axial dipole moment of the geomagnetic field from Brownian fluctuations, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-19012, https://doi.org/10.5194/egusphere-egu2020-19012, 2020

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