Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh42a..01l&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH42A-01
Physics
2723 Magnetic Reconnection (7526, 7835), 7526 Magnetic Reconnection (2723, 7835), 7835 Magnetic Reconnection (2723, 7526), 7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7845 Particle Acceleration
Scientific paper
With the progress of collisionless reconnection models a really burning question arises. Is the reconnection rate fast in collisionless environments and slow when collisions are important? The positive answer to that question means that all MHD simulations of collisional environments do not make sense, as high diffusivity of codes makes numerical reconnection fast. An alternative scheme of reconnection was proposed several years ago and it invokes field wandering induced by MHD turbulence. In the presence of collisionless effects or anomalous resistivity the scheme allows to address the second question above, as it solves the mass and flux outflow constraint without imposing the necessity of having a global X-point. However, our study has shown that the effect of the small- scale magnetic field structure on the rate of magnetic reconnection may be even more profound. The turbulence may affect the rate of reconnection by reducing the transverse scale for the reconnection flow and by allowing many independent reconnection events to occur simultaneously. A non-trivial prediction of the model is that, in the presence of turbulence, the reconnection may be fast even for normal Ohmic resistivity. I shall show our first results on turbulent reconnection, discuss the dependence of the reconnection on the level turbulence, injection scale of turbulence in the system and the dimensionality of the simulations. I shall show that the reconnection is fast, i.e. does not depend on resistivity only in 3D simulations.
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