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Paper: The Magnetic Topology of a Twisted Force-Free Configuration in an Active Region
Volume: 184, Third Advances in Solar Physics Euroconference: Magnetic Fields and Oscillations
Page: 76
Authors: Titov, V. S.; Démoulin, P.
Abstract: It is widely accepted now that flare-like phenomena in active regions are due to magnetic reconnection process in configurations having a topological complexity. Observations demonstrate that such configurations are often characterized by a twisted structure. It is modeled here by a force-free flux tube, whose curved arc-like body is in equilibrium with an external potential magnetic field. We study how the topological structure of this configuration evolves with emerging of the flux tube from below the photosphere until it achieves a nonequilibrium point, where the eruption of the flux tube must occur. At some moment of the emergence process there appears a generalized separator field line, which is determined without null points and along which two separatrix surfaces intersect. Both the separator and these surfaces are topological features, where the magnetic connectivity suffers a jump, which may cause the formation of strong current sheets there. The obtained results give a good insight into the mechanism of solar flares with a twisted magnetic field structure.
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