Magnetic Reconnection by a Self-Retreating X-Line

Details Magnetic Reconnection by a Self-Retreating X-Line Magnetic Reconnection by a Self-Retreating X-Line

2008-08-15

arxiv.org/abs/0808.2179v2

Phys.Rev.Lett.101:205004,2008

Astronomy and Astrophysics

Astrophysics

4 pages; Phys. Rev. Lett., in press

Scientific paper

10.1103/PhysRevLett.101.205004

Particle-in-cell (PIC) simulations of collisionless magnetic reconnection are performed to study asymmetric reconnection in which an outflow is blocked by a hard wall while leaving sufficiently large room for the outflow of the opposite direction. This condition leads to a slow, roughly constant motion of the diffusion region away from the wall, the so-called `X-line retreat'. The typical retreat speed is ~0.1 times the Alfven speed. At the diffusion region, ion flow pattern shows strong asymmetry and the ion stagnation point and the X-line are not collocated. A surprise, however, is that the reconnection rate remains the same unaffected by the retreat motion.

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