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The mechanism for the energy buildup driving solar eruptive events.

Knizhnik, K. J. and Antiochos, S. K. and DeVore, C. R. and Wyper, P. F. (2017) 'The mechanism for the energy buildup driving solar eruptive events.', The astrophysical journal letters., 851 (1). L17.

Abstract

The underlying origin of solar eruptive events (SEEs), ranging from giant coronal mass ejections to small coronal-hole jets, is that the lowest-lying magnetic flux in the Sun's corona undergoes continual buildup of stress and free energy. This magnetic stress has long been observed as the phenomenon of "filament channels:" strongly sheared magnetic field localized around photospheric polarity inversion lines. However, the mechanism for the stress buildup—the formation of filament channels—is still debated. We present magnetohydrodynamic simulations of a coronal volume that is driven by transient, cellular boundary flows designed to model the processes by which the photosphere drives the corona. The key feature of our simulations is that they accurately preserve magnetic helicity, the topological quantity that is conserved even in the presence of ubiquitous magnetic reconnection. Although small-scale random stress is injected everywhere at the photosphere, driving stochastic reconnection throughout the corona, the net result of the magnetic evolution is a coherent shearing of the lowest-lying field lines. This highly counterintuitive result—magnetic stress builds up locally rather than spreading out to attain a minimum energy state—explains the formation of filament channels and is the fundamental mechanism underlying SEEs. Furthermore, this process is likely to be relevant to other astrophysical and laboratory plasmas.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.3847/2041-8213/aa9e0a
Publisher statement:© 2017. The American Astronomical Society. All rights reserved
Date accepted:28 November 2017
Date deposited:02 January 2018
Date of first online publication:08 December 2017
Date first made open access:02 January 2018

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