Two-scale structure of the electron dissipation region during collisionless magnetic reconnection

Details Two-scale structure of the electron dissipation region during collisionless magnetic reconnection Two-scale structure of the electron dissipation region during collisionless magnetic reconnection

2007-04-06

arxiv.org/abs/0704.0818v1

Physics

Plasma Physics

Submitted to Physical Review Letters, 4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.155002

Particle in cell (PIC) simulations of collisionless magnetic reconnection are presented that demonstrate that the electron dissipation region develops a distinct two-scale structure along the outflow direction. The length of the electron current layer is found to decrease with decreasing electron mass, approaching the ion inertial length for a proton-electron plasma. A surprise, however, is that the electrons form a high-velocity outflow jet that remains decoupled from the magnetic field and extends large distances downstream from the x-line. The rate of reconnection remains fast in very large systems, independent of boundary conditions and the mass of electrons.

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