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Magnetic flux ropes: Fundamental structures for eruptive phenomena

Published online by Cambridge University Press:  01 September 2008

Tahar Amari  and
Jean-Jacques Aly
Tahar Amari
Affiliation:
CNRS, Centre de Physique Théorique de l'Ecole Polytechnique, F-91128 Palaiseau Cedex, France email: amari@cpht.polytechnique.fr
Jean-Jacques Aly
Affiliation:
AIM - Unité Mixte de Recherche CEA - CNRS - Université Paris VII - UMR n0 7158, Centre d'Etudes de Saclay, F-91191 Gif sur Yvette Cedex, France
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Abstract

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We consider some general aspects of twisted magnetic flux ropes (TFR), which are thought to play a fundamental role in the structure and dynamics of large scale eruptive events. We first discuss the possibility to show the presence of a TFR in a pre-eruptive configuration by using a model along with observational informations provided by a vector magnetograph. Then we present, in the framework of a generic model in which the coronal field is driven into an evolution by changes imposed at the photospheric level, several mechanisms which may lead to the formation and the disruption of a TFR, including the development of a MHD instability, and we discuss the issues of the energy and helicity contents of an erupting configuration. Finally we report some results of a recent and more ambitious approach to the physics of TFRs in which one tries to describe in a consistent way their rising through the convection zone, their emergence through the photosphere, and their subsequent evolution in the corona.

Keywords

Flux ropesEruptive eventsMHD
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S257: Universal Heliophysical Processes , September 2008 , pp. 211 - 222
Copyright
Copyright © International Astronomical Union 2009

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