Quasi-static and dynamic magnetic tension forces in arched,
line-tied magnetic flux ropes
Authors: C. E. Myers, M. Yamada, H. Ji, J.
Yoo, J. Jara-Almonte, and W. Fox
Abstract: Solar eruptions are often driven by
magnetohydrodynamic instabilities such as the torus and kink
instabilities that act on line-tied magnetic flux ropes.
Recent laboratory experiments designed to study these eruptive
instabilities have demonstrated the key role of both dynamic
[Myers et al., Nature 528, 526 (2015)] and quasi-static [Myers et
al., Phys. Plasmas, submitted (2016)] magnetic tension forces in
contributing to the equilibrium and stability of line-tied
magnetic flux ropes. In this paper, we synthesize these laboratory
results and explore the relationship between the dynamic and
quasi-static tension forces. While the quasi-static tension force
is found to contribute to the flux rope equilibrium in a number of
regimes, the dynamic tension force is significant mostly in the
so-called failed torus regime where magnetic self-organization
events prevent the flux rope from erupting.
Submitted to: Plasma Physics and Controlled Fusion
Download PPPL-5313 (pdf
3.4 MB 12 pp)
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