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Hemispherical dynamos generated by convection in rotating spherical shells

Grote1, Busse

  • 1Institute of Physics, University of Bayreuth, D-95440 Bayreuth, Germany.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|November 23, 2000
PubMed
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Convection-driven dynamos create magnetic fields in one hemisphere of a rotating shell. These fields exhibit chaotic behavior but show cyclical polarity reversals, potentially linked to solar activity.

Area of Science:

  • Geophysics
  • Astrophysics
  • Fluid Dynamics

Background:

  • Understanding the generation and behavior of planetary and stellar magnetic fields is crucial.
  • Convection-driven dynamos are a key mechanism for generating self-sustaining magnetic fields.

Purpose of the Study:

  • To investigate dynamo action in a rotating spherical shell under specific conditions.
  • To characterize the spatial distribution and temporal evolution of generated magnetic fields.

Main Methods:

  • Numerical simulations of magnetohydrodynamics in a rotating spherical shell.
  • Utilizing high Taylor numbers (10^8) and Prandtl numbers (1).

Main Results:

  • Observed magnetic field confinement to either the northern or southern hemisphere.

Related Experiment Videos

  • Chaotic temporal dynamics with discernible latitudinal waves.
  • Cyclical magnetic field polarity reversals identified.

    • Conclusions:

    • Convection-driven dynamos can produce hemispheric magnetic fields.
    • The observed dynamics suggest a potential link to solar magnetic phenomena.
    • Latitudinal waves play a role in the cyclical polarity changes.