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The origin and effect of hemispheric helicity imbalance in solar dynamo

Part of: PLA Topological Methods in MHD, Fluids, and Plasmas

Published online by Cambridge University Press:  05 June 2020

Shangbin Yang Open the ORCID record for Shangbin Yang [Opens in a new window] ,
V. V. Pipin ,
D. D. Sokoloff ,
K. M. Kuzanyan  and
Hongqi Zhang
Shangbin Yang*
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Rd., 100101Beijing, P. R. China University of Chinese Academy of Sciences, 100049Beijing, P. R. China Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing, P. R. China
V. V. Pipin
Affiliation:
Institute of Solar-Terrestrial Physics, Russian Academy of Sciences, Irkutsk, 664033, Russia
D. D. Sokoloff
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Rd., 100101Beijing, P. R. China Department of Physics, Moscow University, 119992Moscow, Russia IZMIRAN, 108840, Moscow, Russia
K. M. Kuzanyan
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Rd., 100101Beijing, P. R. China IZMIRAN, 108840, Moscow, Russia
Hongqi Zhang
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Rd., 100101Beijing, P. R. China
*
†Email address for correspondence: yangshb@nao.cas.cn
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Abstract

In this paper we study the effects of the net magnetic helicity density on the hemispheric symmetry of the dynamo generated large-scale magnetic field. Our study employs the axisymmetric dynamo model which takes into account the nonlinear effect of magnetic helicity conservation. We find that, on the surface, the net magnetic helicity follows the evolution of the parity of the large-scale magnetic field. Random fluctuations of the $\unicode[STIX]{x1D6FC}$-effect and the helicity fluxes can invert the causal relationship, i.e. the net magnetic helicity or the imbalance of magnetic helicity fluxes can drive the magnetic parity breaking. We also found that evolution of the net magnetic helicity of the small-scale fields follows the evolution of the net magnetic helicity of the large-scale fields with some time lag. We interpret this as an effect of the difference of the magnetic helicity fluxes out of the Sun from the large and small scales.

Keywords

astrophysical plasmas
Type
Research Article
Information
Journal of Plasma Physics , Volume 86 , Issue 3 , June 2020 , 775860302
Copyright
© Cambridge University Press 2020

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