Influence of Magnetic Helicity in MHD
Simon Candelaresi, Fabio Del Sordo, Axel Brandenburg
TL;DR
This paper investigates how magnetic helicity influences the decay of magnetic fields in MHD, emphasizing that helicity content, rather than linking, governs the evolution of magnetic structures.
Contribution
It demonstrates that magnetic helicity, not the linking of flux tubes, is the key factor affecting magnetic field decay in MHD configurations.
Findings
Magnetic helicity content determines magnetic field decay.
Linked flux tubes do not necessarily decay faster.
Helicity constraints influence magnetic field evolution.
Abstract
Observations have shown that the Sun's magnetic field has helical structures. The helicity content in magnetic field configurations is a crucial constraint on the dynamical evolution of the system. Since helicity is connected with the number of links we investigate configurations with interlocked magnetic flux rings and one with unlinked rings. It turns out that it is not the linking of the tubes which affects the magnetic field decay, but the content of magnetic helicity.
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