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Titolo: Hidden problems of thin-flux-tube approximation
Autore: Zhugzhda, YD; Goossens, M;
- Indirizzi:
- Katholieke Univ Leuven, Ctr Plasma Astrophys, B-3001 Heverlee, Belgium Katholieke Univ Leuven Heverlee Belgium B-3001 B-3001 Heverlee, Belgium IZMIRAN, Troitsk 142092, Moscow Region, Russia IZMIRAN Troitsk Moscow Region Russia 142092 142092, Moscow Region, Russia
- Titolo Testata:
- ASTRONOMY & ASTROPHYSICS
fascicolo: 1,
volume: 377,
anno: 2001,
pagine: 330 - 342
- SICI:
- 1432-0746(200110)377:1<330:HPOTA>2.0.ZU;2-6
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- SOLITARY WAVES; ROBERTS EQUATION; SOLAR ATMOSPHERE; ROTATING FLUIDS; PROPAGATION;
- Keywords:
- agnetohydrodynamics (MHD); waves; Sun : corona; oscillations;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 21
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Zhugzhda, YD Katholieke Univ Leuven, Ctr Plasma Astrophys, B-3001 Heverlee, Belgium Katholieke Univ Leuven Heverlee Belgium B-3001 lee, Belgium
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- Citazione:
- Y.D. Zhugzhda e M. Goossens, "Hidden problems of thin-flux-tube approximation", ASTRON ASTR, 377(1), 2001, pp. 330-342
Abstract
This paper scrutinizes the validity of the thin-flux-tube approximation for magnetic flux tubes embedded in a surrounding magnetic plasma. It is shown that the thin-flux-tube approximation gives an accurate description of surface waves for C-T(2)>C-Ae(2), body waves for C-Te(2)>C-T(2) and surface leaky waves for C-Te(2)<C-T(2)<C-Ae(2). The Leibovich-Roberts equation for nonlinear surface waves in a flux tube embedded in a field free plasma is generalized to a flux tube immersed in a magnetic plasma. The generalized Leibovich-Roberts (GLR) equation describes the propagation of nonlinear slow surface, body and surface leaky waves in tubes. The shortcomings of the GLR equation are discussed. The Korteweg-de Vries equation (KdV) is generalizedfor surface waves. The advantage of the second order thin-flux-tube approximation is shown. Two scenarios for the heating of coronal loops are discussed. It is emphasized, that the application of the thin-flux-tube approximation to thin tubes of non-zero diameter has to take into account possible wave emission by the tube and shock front formation for amplitudes in excessof some critical value.
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Documento generato il 19/06/13 alle ore 08:42:09