Please use this identifier to cite or link to this item: http://arks.princeton.edu/ark:/88435/dsp0176537458f
 Title: Laboratory study of the failed torus mechanism in arched, line-tied, magnetic flux ropes Contributors: Alt, AndrewJi, HantaoYoo, JongsooBose, SayakGoodman, AaronYamada, MasaakiU. S. Department of Energy contract number DE-AC02-09CH11466U. S. Department of Energy contract number DE-SC0019049NASA grant number 80HQTR17T0005 Keywords: Laboratory plasmaFlux ropeCoronal mass ejectionLaboratory AstrophysicsMHDMRX Issue Date: 2023 Publisher: Princeton Plasma Physics Laboratory, Princeton University Citation: A. Alt, H. Ji, J. Yoo, S. Bose, A. Goodman, and M. Yamada, 2023, Laboratory study of the failed torus mechanism in arched, line-tied, magnetic flux ropes, Princeton Plasma Physics Laboratory, Princeton University DataSpace Related Publication: Physics of plasmas Abstract: Coronal mass ejections (CMEs) are some of the most energetic and violent events in our solar system. The prediction and understanding of CMEs is of particular importance due to the impact that they can have on Earth-based satellite systems, and in extreme cases, ground-based electronics. CMEs often occur when long-lived magnetic flux ropes (MFRs) anchored to the solar surface destabilize and erupt away from the Sun. One potential cause for these eruptions is an ideal magnetohydrodynamic (MHD) instability such as the kink or torus instability. Previous experiments on the Magnetic Reconnection eXperiment (MRX) revealed a class of MFRs that were torus-unstable but kink-stable, which failed to erupt. These “failed-tori” went through a process similar to Taylor relaxation where the toroidal current was redistributed before the eruption ultimately failed. We have investigated this behavior through additional diagnostics that measure the current distribution at the foot points and the energy distribution before and after an event. These measurements indicate that ideal MHD effects are sufficient to explain the energy distribution changes during failed torus events. This excludes Taylor relaxation as a possible mechanism of current redistribution during an event. A new model that only requires non-ideal effects in a thin layer above the electrodes is presented to explain the observed phenomena. This work broadens our understanding of the stability of MFRs and the mechanism behind the failed torus through the improved prediction of the torus instability and through new diagnostics to measure the energy inventory and current profile at the foot points. URI: http://arks.princeton.edu/ark:/88435/dsp0176537458f Appears in Collections: Plasma Science & Technology

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