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Titolo: Confined disruption of a three-dimensional twisted magnetic flux tube
Autore: Amari, T; Luciani, JF;
- Indirizzi:
- CEA Saclay, Serv Astrophys, DAPNIA,URA 2052, DSM,Ctr Nalt Rech Sci, F-91191 CEA Saclay Gif Sur Yvette France F-91191 DSM,Ctr Nalt Rech Sci, F-91191 Ecole Polytech, CNRS, Ctr Phys Theor, F-91128 Palaiseau, France Ecole Polytech Palaiseau France F-91128 Theor, F-91128 Palaiseau, France
- Titolo Testata:
- ASTROPHYSICAL JOURNAL
fascicolo: 2,
volume: 515,
anno: 1999,
parte:, 2
pagine: L81 - L84
- SICI:
- 0004-637X(19990420)515:2<L81:CDOATT>2.0.ZU;2-9
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- TIED CORONAL LOOPS; KINK INSTABILITY; LINEAR-STABILITY; FIELD; EVOLUTION; ENERGY;
- Keywords:
- MHD; stars : coronae; stars : flare; stars : magnetic fields;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 23
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Amari, T CEA Saclay, Serv Astrophys, DAPNIA,URA 2052, DSM,Ctr Nalt Rech Sci, F-91191 CEA Saclay Gif Sur Yvette France F-91191 Nalt Rech Sci, F-91191
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- Citazione:
- T. Amari e J.F. Luciani, "Confined disruption of a three-dimensional twisted magnetic flux tube", ASTROPHYS J, 515(2), 1999, pp. L81-L84
Abstract
In this Letter, we study the evolution of a magnetic flux tube confined byan overlaying arcade, considering the gradual build up of the twist in theflux 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 anda closed overlaying arcade. The model might represent a basis for a unified theory of noneruptive and eruptive flares, in which twisted magnetic fluxtubes play a crucial role.
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Documento generato il 25/05/13 alle ore 05:47:04