Solar dynamo cycle variations with a rotational period

Abstract

Using the non-linear mean-field dynamo models we calculate the magnetic cycle parameters, like the dynamo cycle period, the amplitude of the total magnetic energy, and the Poynting flux luminosity from the surface for the solar analogs with rotation periods of range from 1 to 30 days. We do simulations both for the kinematic and non-kinematic dynamo models. The kinematic dynamo models, which take into account the non-linear $\alpha$-effect and the loss of the magnetic flux due to magnetic buoyancy, show a decrease of the magnetic cycle with the decrease of the stellar rotation period. The stars with a rotational period of less than 10 days show the non-stationary long-term variations of the magnetic activity. The non-kinematic dynamo models take into account the magnetic field feedback on the large-scale flow and heat transport inside the convection zone. They show the non-monotonic variation of the dynamo period with the rotation rate. The models for the rotational periods fewer than 10 days show the non-stationary evolution with a slight increase in the primary dynamo period with the increase of the rotation rate. The non-kinematic models show the growth of the dynamo generated magnetic flux with the increase of the rotation rate. There is a dynamo saturation for the star rotating with a period of two days and less. The saturation of the magnetic activity parameters is accompanied by depression of the differential rotation.

19 pages, 18 figures, accepted in MNRAS

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Cited by in corpus (10)

• Powering Stellar Magnetism: Energy Transfers in Cyclic Dynamos of Sun-like Stars
• Turbulent processes and mean-field dynamo
• Effects of Emerging Bipolar Magnetic Regions in Mean-field Dynamo Model of Solar Cycles 23 and 24
• On the origin of the dichotomy of stellar activity cycles
• Impact of anti-solar differential rotation in mean-field solar-type dynamos -- Exploring possible magnetic cycles in slowly rotating stars
• On effects of surface bipolar magnetic regions on the convection zone dynamo
• The Dependence of Stellar Activity Cycles on Effective Temperature
• Solar and stellar flares: frequency, active regions and stellar dynamo
• Spatio-temporal non-localities in a solar-like mean-field dynamo
• Investigating global convective dynamos with mean-field models: full spectrum of turbulent effects required