Fast MHD Magnetic Reconnection on Macroscopic Scales: Turbulent Regime Based on Plasma Self-Feeding

Details Fast MHD Magnetic Reconnection on Macroscopic Scales: Turbulent Regime Based on Plasma Self-Feeding Fast MHD Magnetic Reconnection on Macroscopic Scales: Turbulent Regime Based on Plasma Self-Feeding

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm21b..03l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM21B-03

Physics

2723 Magnetic Reconnection (7526, 7835), 7509 Corona, 7526 Magnetic Reconnection (2723, 7835), 7835 Magnetic Reconnection (2723, 7526)

Scientific paper

We find that on the same given macroscopic system described with a visco-resistive MHD (without any Hall or extended MHD terms) approach, magnetic reconnection can progress in two entirely different ways. The first is the well-known laminar Sweet-Parker process. But a second, completely different and chaotic reconnection process is possible. This regime presents properties of immediate observational and experimental relevance [1]: i) it is much faster, developing on scales of the order of the Alfvén time rather than the usual diffusive time of resistive processes, and ii) the areas of reconnection become distributed chaotically over a macroscopic area of the system. The onset of this fast chaotic reconnection process is the formation of closed circulation patterns where the jet going out of the reconnection region turns around and forces its way back in, carrying along copious amounts of magnetic flux and allowing fast macroscopic reconnection. [1] G. Lapenta, Self-Feeding Turbulent Magnetic Reconnection on Macroscopic Scales, Physical Review Letters, 100, 235001, 2008.

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