Magnetic field evolution in solar-type stars

Author:

Brandenburg AxelORCID

Abstract

AbstractWe discuss selected aspects regarding the magnetic field evolution of solar-type stars. Most of the stars with activity cycles are in the range where the normalized chromospheric Calcium emission increases linearly with the inverse Rossby number. For Rossby numbers below about a quarter of the solar value, the activity saturates and no cycles have been found. For Rossby numbers above the solar value, again no activity cycles have been found, but now the activity goes up again for a major fraction of the stars. Rapidly rotating stars show nonaxisymmetric large-scale magnetic fields, but there is disagreement between models and observations regarding the actual value of the Rossby number where this happens. We also discuss the prospects of detecting the sign of magnetic helicity using various linear polarization techniques both at the stellar surface using the parity-odd contribution to linear polarization and above the surface using Faraday rotation.

Publisher

Cambridge University Press (CUP)

Subject

Astronomy and Astrophysics,Space and Planetary Science

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Batchelor, Saffman, and Kazantsev spectra in galactic small-scale dynamos;Monthly Notices of the Royal Astronomical Society;2022-11-28

2. Ill-posedness of the mean-field dynamo equations with a linear electromotive force;Physica D: Nonlinear Phenomena;2022-02

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