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Solar Physics

, 294:14 | Cite as

Large-scale Model of the Axisymmetric Dynamo with Feedback Effects

  • Laura SraibmanEmail author
  • Fernando Minotti
Article
  • 42 Downloads

Abstract

A dynamo model is presented, based on a previously introduced kinematic model, in which the effect of the magnetic field on the mass flow through the Lorentz force is included. Given the base mass flow corresponding to the case with no magnetic field, and assuming that the modification of this flow through the Lorentz force can be treated as a perturbation, a complete model of the large-scale magnetic field dynamics can be obtained. The input needed consists of the large-scale meridional and zonal flows, the small-scale magnetic diffusivity, and a constant parameter entering the expression of the \(\alpha \)-effect. When applied to a Sun-like star, the model shows realistic dynamics of the magnetic field, including cycle duration, consistent field amplitudes with the correct parity, progression of the zonal magnetic field toward the equator, and motion toward the poles of the radial field at high latitudes. In addition, the radial and zonal components show a correct phase relation, and at the surface level, the magnetic helicity is predominantly negative in the northern hemisphere and positive in the southern hemisphere.

Keywords

Solar cycle, models Magnetic fields, models 

Notes

Acknowledgements

We acknowledge the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and the University of Buenos Aires for institutional support.

Disclosure of Potential Conflicts of Interest

The authors declare that they have no conflicts of interest.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Facultad de Ciencias Exactas y Naturales, Departamento de FísicaUniversidad de Buenos AiresBuenos AiresArgentina
  2. 2.Instituto de Física del Plasma (INFIP)CONICET-Universidad de Buenos AiresBuenos AiresArgentina

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