EGU25-14023, updated on 15 Mar 2025
https://doi.org/10.5194/egusphere-egu25-14023
EGU General Assembly 2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Oral | Tuesday, 29 Apr, 08:35–08:55 (CEST)
 
Room K1
Magnetic field generation by a Basal Magma Ocean
Nathanael Schaeffer1, Jonathan Aurnou2, and Stéphane Labrosse3
Nathanael Schaeffer et al.
  • 1Université Grenoble Alpes, CNRS, ISTerre, Grenoble, France
  • 2Earth, Planetary and Space Sciences, University of California, Los Angeles, USA
  • 3ENS de Lyon, Lyon, France

A Magma Ocean at the base of Earth's mantle (BMO), if stirred by sufficiently vigorous convection, may have a sufficient electrical conductivity to sustain a magnetic field.
However, this possibility rests on several results that are based on knowledge obtained mostly from numerical simulations of Earth-core dynamos, which arguably operate in a different regime -- both in terms of geometry (a thick spherical shell) and dynamical balance.
With the help of dedicated numerical simulations in a thin spherical shell geometry, we study how such magnetic fields would look like (intensity, geometry) and what are the required conditions for an Earth-like magnetic field to be produced by a BMO.

How to cite: Schaeffer, N., Aurnou, J., and Labrosse, S.: Magnetic field generation by a Basal Magma Ocean, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-14023, https://doi.org/10.5194/egusphere-egu25-14023, 2025.