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Magnetic field evolution in solar-type stars

Published online by Cambridge University Press:  24 September 2020

Axel Brandenburg Open the ORCID record for Axel Brandenburg [Opens in a new window]
Axel Brandenburg*
Affiliation:
Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden Department of Astronomy, Stockholm University, SE-10691 Stockholm, Sweden JILA and Laboratory for Atmospheric and Space Physics, Univ. Colorado, Boulder, USA McWilliams Center for Cosmology, Carnegie Mellon University, Pittsburgh, PA 15213, USA Faculty of Natural Sciences and Medicine, Ilia State University, 0194 Tbilisi, Georgia email: brandenb@nordita.org
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Abstract

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We 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.

Keywords

(magnetohydrodynamics:) MHDturbulencetechniques: polarimetricSun: magnetic fieldsstars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 169 - 180
Copyright
© International Astronomical Union 2020

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