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A&A 444, 961976 (2005) DOI: 10.1051/0004-6361:20053600

Summary: A&A 444, 961­976 (2005)
DOI: 10.1051/0004-6361:20053600
c ESO 2005
Current sheet formation in quasi-separatrix layers
and hyperbolic flux tubes
G. Aulanier, E. Pariat, and P. Démoulin
Observatoire de Paris, LESIA, 92195 Meudon Cedex, France
e-mail: guillaume.aulanier@obspm.fr
Received 9 June 2005 / Accepted 26 July 2005
In 3D magnetic field configurations, quasi-separatrix layers (QSLs) are defined as volumes in which field lines locally display strong gradients
of connectivity. Considering QSLs both as the preferential locations for current sheet development and magnetic reconnection, in general,
and as a natural model for solar flares and coronal heating, in particular, has been strongly debated issues over the past decade. In this paper,
we perform zero- resistive MHD simulations of the development of electric currents in smooth magnetic configurations which are, strictly
speaking, bipolar though they are formed by four flux concentrations, and whose potential fields contain QSLs. The configurations are driven by
smooth and large-scale sub-Alfvénic footpoint motions. Extended electric currents form naturally in the configurations, which evolve through a
sequence of quasi non-linear force-free equilibria. Narrow current layers also develop. They spontaneously form at small scales all around the


Source: Aulanier, Guillaume - Observatoire de Paris


Collections: Physics