Fast reconnection rate in electron-positron plasma based on group velocity cones of inertial Alfven wavesNagendra Singh
Department of Electrical and Computer Engineering, University of Alabama - Huntsville, AL 35899, USA
received 21 May 2009; accepted in final form 15 June 2009; published July 2009
published online 9 July 2009
Some recent simulations employing large size of the simulated plasma show that the reconnection structures in electron-positron plasmas have small flare angles. The apex of the wedge formed by the flaring is at the evolving diffusion centers. We find that reported half-cone angles () of the wedges and the reconnection rates (R) obey the relation R ~ . We suggest here that the flaring is caused by the radiation of inertial Alfven waves (IAWs) from a diffusion region (DR); these waves propagate in the outer region of the current sheet (CS) where plasma is < 1. Since the wave propagation is controlled by the group velocity, the flaring half-angles are the group velocity cone angles of the IAWs. Based on the dispersive relation for IAWs, we calculate the group velocity cone angles and resulting reconnection rates. The rates and the angles are compared with those found in simulations.
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96.60.Iv - Solar physics: Magnetic reconnection.
52.35.Vd - Waves, oscillations, and instabilities in plasmas and intense beams: Magnetic reconnection.
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