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A dynamic magnetic tension force as the cause of failed solar eruptions

Journal Article · · Nature (London)
DOI:https://doi.org/10.1038/nature16188· OSTI ID:1259404
 [1];  [2];  [3];  [2];  [2];  [1];  [4];  [4]
  1. Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences; Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences; Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Harbin Inst Technol Heilongjiang, PR (China)
  4. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)

Coronal mass ejections are solar eruptions driven by a sudden release of magnetic energy stored in the Sun's corona. In many cases, this magnetic energy is stored in long-lived, arched structures called magnetic flux ropes. When a flux rope destabilizes, it can either erupt and produce a coronal mass ejection or fail and collapse back towards the Sun. The prevailing belief is that the outcome of a given event is determined by a magnetohydrodynamic force imbalance called the torus instability. This belief is challenged, however, by observations indicating that torus-unstable flux ropes sometimes fail to erupt. This contradiction has not yet been resolved because of a lack of coronal magnetic field measurements and the limitations of idealized numerical modelling. In this paper, we report the results of a laboratory experiment that reveal a previously unknown eruption criterion below which torus-unstable flux ropes fail to erupt. We find that such 'failed torus' events occur when the guide magnetic field (that is, the ambient field that runs toroidally along the flux rope) is strong enough to prevent the flux rope from kinking. Under these conditions, the guide field interacts with electric currents in the flux rope to produce a dynamic toroidal field tension force that halts the eruption. Lastly, this magnetic tension force is missing from existing eruption models, which is why such models cannot explain or predict failed torus events.

Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
National Science Foundation/DoE Center for Magnetic Self-Organization (CMSO)
Grant/Contract Number:
AC02-09CH11466
OSTI ID:
1259404
Journal Information:
Nature (London), Journal Name: Nature (London) Journal Issue: 7583 Vol. 528; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (20)

Explosive Magnetotail Activity journal May 2019
Statistical Study of Magnetic Topology for Eruptive and Confined Solar Flares journal March 2018
Understanding the Twist Distribution Inside Magnetic Flux Ropes by Anatomizing an Interplanetary Magnetic Cloud: TWIST DISTRIBUTION IN AN INTERPLANETARY MC journal May 2018
Ideal MHD instabilities for coronal mass ejections: interacting current channels and particle acceleration journal November 2019
Understanding the dynamics and energetics of magnetic reconnection in a laboratory plasma: Review of recent progress on selected fronts journal May 2016
Laboratory study of low-β forces in arched, line-tied magnetic flux ropes journal November 2016
Sausage instabilities on top of kinking lengthening current-carrying magnetic flux tubes journal May 2017
Laboratory space physics: Investigating the physics of space plasmas in the laboratory journal May 2018
The emergence of magnetic flux and its role on the onset of solar dynamic events journal May 2019
Statistical Analysis of Torus and Kink Instabilities in Solar Eruptions journal September 2018
Magnetohydrodynamic Simulation of the X9.3 Flare on 2017 September 6: Evolving Magnetic Topology journal December 2018
The Role of a Tiny Brightening in a Huge Geoeffective Solar Eruption Leading to the St. Patrick’s Day Storm journal March 2019
Two-step Evolution of a Rising Flux Rope Resulting in a Confined Solar Flare journal June 2019
A Study of Pre-flare Solar Coronal Magnetic Fields: Magnetic Flux Ropes journal October 2019
Onset Mechanism of M6.5 Solar Flare Observed in Active Region 12371 journal December 2019
Why Do Torus-unstable Solar Filaments Experience Failed Eruptions? journal May 2019
Laboratory Space Physics: Investigating the Physics of Space Plasmas in the Laboratory text January 2018
The Role of a Tiny Brightening in a Huge Geo-effective Solar Eruption Leading to the St Patrick's Day Storm text January 2019
The emergence of magnetic flux and its role on the onset of solar dynamic events text January 2019
Why torus-unstable solar filaments experience failed eruption? text January 2019

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