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The magnetic helicity density patterns from non-axisymmetric solar dynamo

Part of: PLA Topological Methods in MHD, Fluids, and Plasmas Focus on Plasma Astrophysics

Published online by Cambridge University Press:  04 February 2021

Valery V. Pipin Open the ORCID record for Valery V. Pipin [Opens in a new window]
Valery V. Pipin*
Affiliation:
Institute for Solar-Terrestrial Physics, PO Box 291, Lermontov St., 126a, Irkutsk664033, Russia
*
†Email address for correspondence: [email protected]
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Abstract

We study the helicity density patterns which can result from the emerging bipolar regions. Using the relevant dynamo model and the magnetic helicity conservation law we find that the helicity density patterns around the bipolar regions depend on the configuration of the ambient large-scale magnetic field, and in general they show a quadrupole distribution. The position of this pattern relative to the equator can depend on the tilt of the bipolar region. We compute the time–latitude diagrams of the helicity density evolution. The longitudinally averaged effect of the bipolar regions shows two bands of sign for the density distributions in each hemisphere. Similar helicity density patterns are provided by the helicity density flux from the emerging bipolar regions subjected to surface differential rotation.

Keywords

astrophysical plasmasplasma simulationspace plasma physics
Type
Research Article
Information
Journal of Plasma Physics , Volume 87 , Issue 1 , February 2021 , 775870101
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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