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The Puzzling Dynamos of Stars: Recent Progress With Global Numerical Simulations

Published online by Cambridge University Press:  12 September 2017

Antoine Strugarek ,
Patrice Beaudoin ,
Paul Charbonneau  and
Allan S. Brun
Antoine Strugarek
Affiliation:
Laboratoire AIM Paris-Saclay, CEA/Irfu Université Paris-Diderot CNRS/INSU, F- 91191Gif-sur-Yvette email: antoine.strugarek@cea.fr Département de physique, Université de Montréal, C.P. 6128 Succ.Centre-Ville, Montréal, QC H3C-3J7, Canada
Patrice Beaudoin
Affiliation:
Département de physique, Université de Montréal, C.P. 6128 Succ.Centre-Ville, Montréal, QC H3C-3J7, Canada
Paul Charbonneau
Affiliation:
Département de physique, Université de Montréal, C.P. 6128 Succ.Centre-Ville, Montréal, QC H3C-3J7, Canada
Allan S. Brun
Affiliation:
Laboratoire AIM Paris-Saclay, CEA/Irfu Université Paris-Diderot CNRS/INSU, F- 91191Gif-sur-Yvette email: antoine.strugarek@cea.fr
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Abstract

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The origin of magnetic cycles in the Sun and other cool stars is one of the great theoretical challenge in stellar astrophysics that still resists our understanding. Ab-initio numerical simulations are today required to explore the extreme turbulent regime in which stars operate and sustain their large-scale, cyclic magnetic field. We report in this work on recent progresses made with high performance numerical simulations of global turbulent convective envelopes. We rapidly review previous prominent results from numerical simulations, and present for the first time a series of turbulent, global simulations producing regular magnetic cycles whose period varies systematically with the convective envelope parameters (rotation rate, convective luminosity). We find that the fundamentally non-linear character of the dynamo simulated in this work leads the magnetic cycle period to be inversely proportional to the Rossby number. These results promote an original interpretation of stellar magnetic cycles, and could help reconcile the cyclic behaviour of the Sun and other solar-type stars.

Keywords

Sun: magnetic fieldsSun: interiorstars: magnetic fields(magnetohydrodynamics:) MHD
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S328: Living Around Active Stars , October 2016 , pp. 1 - 11
Copyright
Copyright © International Astronomical Union 2017 

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