Reconciling solar and stellar magnetic cycles with nonlinear dynamo simulations
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...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2017-07, Vol.357 (6347), p.185-187 |
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| container_title | Science (American Association for the Advancement of Science) |
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| creator | Strugarek, A. Beaudoin, P. Charbonneau, P. Brun, A. S. do Nascimento, J.-D. |
| description | 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. |
| doi_str_mv | 10.1126/science.aal3999 |
| format | Article |
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| source | American Association for the Advancement of Science; Jstor Complete Legacy |
| subjects | Astrophysics Convection Coriolis force Fluid dynamics Fluid flow Luminosity Magnetic fields Magnetohydrodynamic simulation Magnetohydrodynamic turbulence Physics Simulation Solar magnetic field Stars Stellar activity Stellar magnetic fields Stellar rotation Sun Sunspot cycle |
| title | Reconciling solar and stellar magnetic cycles with nonlinear dynamo simulations |
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