Eruptive Instability of the Magnetic-Flux Rope: Gravitational Force and Mass-Unloading

Based on the Kuperus–Raadu filament model, we analyze the vertical stability of a magnetic-flux rope as a whole, taking into account the gravitational force and mass-unloading. We use the small-perturbation method to determine conditions of the eruptive instability caused by vertical displacements....

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Bibliographic Details
Published in:Solar physics 2019-03, Vol.294 (3), p.1-10, Article 35
Main Authors: Tsap, Y. T., Filippov, B. P., Kopylova, Y. G.
Format: Article
Language:English
Subjects:
Astrophysics and Astroparticles
Atmospheric Sciences
Destabilization
Equilibrium
Fluctuations
Gravitation
Instability
Magnetic fields
Magnetic flux
Observatories
Perturbation methods
Physics
Physics and Astronomy
Solar physics
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Stability
Stability analysis
Sun
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Summary:Based on the Kuperus–Raadu filament model, we analyze the vertical stability of a magnetic-flux rope as a whole, taking into account the gravitational force and mass-unloading. We use the small-perturbation method to determine conditions of the eruptive instability caused by vertical displacements. It has been shown that the upper limit of the magnetic-field decay index describing the flux-rope stability increases with an increase of its mass. The decrease of the flux-rope mass leads to activation and subsequent eruption of the filament. Possible mechanisms of the solar-filament destabilization are discussed.
ISSN:0038-0938
1573-093X
DOI:10.1007/s11207-019-1423-9