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Distribution of Energy-release Events Due to Magnetic Braiding
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Distribution of Energy-release Events Due to Magnetic Braiding
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Journal Article
Distribution of Energy-release Events Due to Magnetic Braiding
2026
Overview
Energy conversion by reconnection-powered nanoflare heating is one of the leading explanations for the heating of the solar chromosphere and corona. The aim of this paper is to shed light on this mechanism by exploring the magnetic Reynolds-number dependence of the energy-conversion process. To do this we employ boundary-driven, magnetohydrodynamic, flux-braiding simulations at different magnetic Reynolds numbers (Rm) and explore in detail the properties of the individual magnetic energy-release events. The properties of the reconnecting current sheets that mediate the energy release are shown to depend on Rm. For increasing Rm, the current sheets become thinner, more intense, and more numerous. For sufficiently large Rm, the current sheets fragment along their length, leading to a sharp cutoff in the current-sheet length distribution. The cutoff is consistent with the threshold for nonlinear tearing/plasmoid instability. For increasing Rm the magnetic field lines become increasingly tangled, the mean and peak values of the magnetic-field strength increase, and the Poynting flux into the domain increases, implying that the heating rate also increases. The global reconnection rate is essentially independent of Rm. These results support the braiding mechanism as a viable way to effectively heat the internal portions of coherent flux tubes in the corona.
Publisher
IOP Publishing
Subject
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