Magnetic effects on fields morphologies and reversals in geodynamo simulations

  title={Magnetic effects on fields morphologies and reversals in geodynamo simulations},
  author={M'elissa D. Menu and Ludovic Petitdemange and S{\'e}bastien Galtier},
  journal={Physics of the Earth and Planetary Interiors},

Geomagnetic semblance and dipolar–multipolar transition in top-heavy double-diffusive geodynamo models

Convection in the liquid outer core of the Earth is driven by thermal and chemical perturbations. The main purpose of this study is to examine the impact of double-diffusive convection on magnetic



Dipole Collapse and Dynamo Waves in Global Direct Numerical Simulations

Magnetic fields of low-mass stars and planets are thought to originate from self-excited dynamo action in their convective interiors. Observations reveal a variety of field topologies ranging from

Systematic parameter study of dynamo bifurcations in geodynamo simulations

The influence of magnetic fields in planetary dynamo models

Strong-field spherical dynamos

  • E. Dormy
  • Physics
    Journal of Fluid Mechanics
  • 2016
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.

Turbulent geodynamo simulations: a leap towards Earth's core

We present an attempt to reach realistic turbulent regime in direct numerical simulations of the geodynamo. We rely on a sequence of three convection-driven simulations in a rapidly rotating

Approaching a realistic force balance in geodynamo simulations

This work shows that the state-of-the-art simulations with a viscosity that is lower than in most simulations, but still much larger than in Earth’s core, can approach a realistic force balance, and shows, by a direct analysis of the relevant forces, that a MAC balance can be achieved when the viscosities are reduced to values close to the current practical limit.

Force balance in numerical geodynamo simulations: a systematic study

Dynamo action in the Earth’s outer core is expected to be controlled by a balance between pressure, Coriolis, buoyancy and Lorentz forces, with marginal contributions from inertia and viscous

Scaling properties of convection-driven dynamos in rotating spherical shells and application to planetary magnetic fields

SUMMARY We study numerically an extensive set of dynamo models in rotating spherical shells, varying all relevant control parameters by at least two orders of magnitude. Convection is driven by a

Strong field, scale separated, ultra low viscosity dynamos

The mechanism by which the Earth's magnetic field is generated is thought to be thermal convection in the metallic liquid iron core. Computational considerations previously restricted most numerical