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Interpreting magnetic helicity flux in solar flux emergence

Prior, C; MacTaggart, D

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Authors

D MacTaggart



Abstract

Magnetic helicity flux gives information about the topology of a magnetic field passing through a boundary. In solar physics applications, this boundary is the photosphere and magnetic helicity flux has become an important quantity in analysing magnetic fields emerging into the solar atmosphere. In this work we investigate the evolution of magnetic helicity flux in magnetohydrodynamic (MHD) simulations of solar flux emergence. We consider emerging magnetic fields with different topologies and investigate how the magnetic helicity flux patterns correspond to the dynamics of emergence. To investigate how the helicity input is connected to the emergence process, we consider two forms of the helicity flux. The first is the standard form giving topological information weighted by magnetic flux. The second form represents the net winding and can be interpreted as the standard helicity flux less the magnetic flux. Both quantities provide important and distinct information about the structure of the emerging field and these quantities differ significantly for mixed sign helicity fields. A novel aspect of this study is that we account for the varying morphology of the photosphere due to the motion of the dense plasma lifted into the chromosphere. Our results will prove useful for the interpretation of magnetic helicity flux maps in solar observations.

Citation

Prior, C., & MacTaggart, D. (2019). Interpreting magnetic helicity flux in solar flux emergence. Journal of Plasma Physics, 85(2), Article 775850201. https://doi.org/10.1017/s0022377819000229

Journal Article Type Article
Acceptance Date Feb 6, 2019
Online Publication Date Mar 18, 2019
Publication Date Apr 30, 2019
Deposit Date Feb 21, 2019
Publicly Available Date Sep 19, 2019
Journal Journal of Plasma Physics
Print ISSN 0022-3778
Electronic ISSN 1469-7807
Publisher Cambridge University Press
Peer Reviewed Peer Reviewed
Volume 85
Issue 2
Article Number 775850201
DOI https://doi.org/10.1017/s0022377819000229

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Copyright Statement
This article has been published in a revised form in Journal of plasma physics https://doi.org/10.1017/S0022377819000229. This version is free to view and download for private research and study only. Not for re-distribution, re-sale or use in derivative works. © Cambridge University Press 2019.







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