Volume 87, Number 1, July 2009
Article Number 19001
Number of page(s) 5
Section Geophysics, Astronomy and Astrophysics
Published online 09 July 2009
EPL, 87 (2009) 19001
DOI: 10.1209/0295-5075/87/19001

Fast reconnection rate in electron-positron plasma based on group velocity cones of inertial Alfven waves

Nagendra 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 ($\theta $) of the wedges and the reconnection rates (R) obey the relation R ~ $\theta $. 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 $\beta $ 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.

94.30.cp - Physics of the magnetosphere: Magnetic reconnection.
96.60.Iv - Solar physics: Magnetic reconnection.
52.35.Vd - Waves, oscillations, and instabilities in plasmas and intense beams: Magnetic reconnection.

© EPLA 2009