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Current build-up in emerging serpentine flux tubes View all abstracts by submitter

Etienne Pariat   Submitted: 2009-07-06 09:52

The increase of magnetic flux in the solar atmosphere during active-region formation involves the transport of the magnetic field from the solar convection zone through the lowest layers of the solar atmosphere, through which the plasma beta changes from >1 to <1 with altitude. The crossing of this magnetic transition zone requires the magnetic field to adopt a serpentine shape also known as the ''sea-serpent'' topology. In the frame of the resistive flux-emergence model, the rising of the magnetic flux is believed to be dynamically driven by a succession of magnetic reconnections which are commonly observed in emerging flux regions as Ellerman bombs. Using a data-driven, three-dimensional (3D) magnetohydrodynamic numerical simulation of flux emergence occurring in active region 10191 on November 16-17, 2002, we study the development of 3D electric current sheets. We show that these currents build-up along the 3D serpentine magnetic-field structure as a result of photospheric diverging horizontal line-tied motions that emulate the observed photospheric evolution. We observe that reconnection can not only develop following a ''pinching'' evolution of the serpentine field line, as usually assumed in 2D geometry, but can also result from 3D shearing deformation of the magnetic structure. In addition, we report for the first time on the observation in the UV domain with the Transition Region and Coronal Explorer (TRACE) of extremely transient loop-like features, appearing within the emerging flux domain, which link several Ellermam bombs with one another. We argue that these loop transients can be explained as a consequence of the currents that build up along the serpentine magnetic field.

Authors: E. Pariat, S. Masson, G. Aulanier
Projects: TRACE

Publication Status: ApJ (in press)
Last Modified: 2009-07-09 08:13
Go to main E-Print page  3D Coronal Structures and Magnetic Field during a Total Solar Eclipse 29. March 2006.  Coronal mass ejections and space weather  Edit Entry  Download Preprint  Delete Entry 

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