3D Magnetic reconnection: evolution of x-lines.

Details 3D Magnetic reconnection: evolution of x-lines. 3D Magnetic reconnection: evolution of x-lines.

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm53b0410d&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM53B-0410

Mathematics

Logic

7827 Kinetic And Mhd Theory, 7835 Magnetic Reconnection, 7843 Numerical Simulation Studies

Scientific paper

In 3D reconnecting systems, the presence and evolution of x-points and x-lines play a crucial role in determining the topological transitions of the magnetic field [1]. Recently the attention has turned towards understanding the evolution of an initial perturbation in 3D where a current sheet is compressed in a localized region. Reconnection develops in the compressed region, forming an x-line. Subsequently, the x-line extends showing an anisotropic behaviour. Based on Hall-MHD theory, the electrons accelerated in the reconnection region and still tied to the field lines, bend the field lines in the current aligned direction leading to a domino effect that propagates the x-line in the electron direction (i.e. against the current) [2]. In contrast with the electron-dominated scenario, in presence of thicker sheet and for ion dominated current sheet, the process of x-line extension is observed to propagate in the opposite direction, following the ion motion. We will present a number of kinetic, hybrid, Hall-less hybrid and Hall-MHD simulations to clarify the issue and to determine the relative importance of the two effects. [1] Lau and Finn, Ap.J., 350, 672 (1990). [2] Huba and Rudakov, PoP, 9, 4435 (2002); Shay et al, GRL, 30, 1345 (2003)

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