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Reconciling solar and stellar magnetic cycles with nonlinear dynamo simulations

A. Strugarek 1, 2, * P. Beaudoin 1 P. Charbonneau 1 A. S. Brun 2 J.-D. Do Nascimento 3, 4
* Corresponding author
1 Département de Physique [Montréal]
2 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
3 Departamento de Fisica Teorica e Experimental
4 CfA - Harvard-Smithsonian Center for Astrophysics
Abstract : The magnetic fields of solar-type stars are observed to cycle over decadal periods—11 years in the case of the Sun. The fields originate in the turbulent convective layers of stars and have a complex dependency upon stellar rotation rate. We have performed a set of turbulent global simulations that exhibit magnetic cycles varying systematically with stellar rotation and luminosity. We find that the magnetic cycle period is inversely proportional to the Rossby number, which quantifies the influence of rotation on turbulent convection. The trend relies on a fundamentally nonlinear dynamo process and is compatible with the Sun’s cycle and those of other solar-type stars.
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https://hal-cea.archives-ouvertes.fr/cea-01588365
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Submitted on : Friday, September 15, 2017 - 3:16:21 PM
Last modification on : Tuesday, December 8, 2020 - 10:09:36 AM

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A. Strugarek, P. Beaudoin, P. Charbonneau, A. S. Brun, J.-D. Do Nascimento. Reconciling solar and stellar magnetic cycles with nonlinear dynamo simulations. Science, American Association for the Advancement of Science, 2017, 357 (6347), pp.185 - 187. ⟨10.1126/science.aal3999⟩. ⟨cea-01588365⟩

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