Confined Disruption of a Three-dimensional Twisted Magnetic Flux Tube

Details Confined Disruption of a Three-dimensional Twisted Magnetic Flux Tube Confined Disruption of a Three-dimensional Twisted Magnetic Flux Tube

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...515l..81a&link_type=abstract

The Astrophysical Journal, Volume 515, Issue 2, pp. L81-L84.

Astronomy and Astrophysics

Astronomy

37

Magnetohydrodynamics: Mhd, Stars: Coronae, Stars: Flare, Stars: Magnetic Fields

Scientific paper

In this Letter, we study the evolution of a magnetic flux tube confined by an overlaying arcade, considering the gradual build up of the twist in the flux tube. During a first stage, the magnetic field evolves quasi-statically through a sequence of force-free equilibria, building up self-helicity (twist) in the flux rope. When a sufficient amount of twist is injected in the system, it cannot reach a neighboring equilibrium and experiences a major disruption in which the magnetic field of the flux tube reconnects with the overlaying arcade. After the relaxation is completed, the configuration remains globally closed and consists of two almost untwisted flux tubes and a closed overlaying arcade. The model might represent a basis for a unified theory of noneruptive and eruptive flares, in which twisted magnetic flux tubes play a crucial role.

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