National Institutes of Natural Science, National Institute for Fusion Science
Department of Helical Plasma Research, Fundamental Physics Simulation Research Division

Magnetic Reconnection

Dynamics of Collisionless Reconnection in Three-dimensional Open System

We have developed electromagnetic particle simulation method for three-dimensional open system and study the triggering mecha-nism of collisionless reconnection and its dynamical behavior. Figure shows that two magnetic islands are formed as a result of magnetic reconnection and move in the downstream while being kinked.

H. Ohtani, S. Ishiguro, R. Horiuchi, Y. Hayashi and N. Horiuchi, Development of Electromagnetic Particle Simulation Code in an Open System, Lecture Notes in Computer Science in print.
R. Horiuchi, H. Ohtani and A. Ishizawa, Towards cross-hierarchy simulation of collisionless driven reconnection in an open system, J. Plsama Phys. Volume 72 (2006) 953
H. Ohtani, R. Horiuchi and A. Ishizawa, Three Dimensional Particle Simulation on Structure Formation and Plasma Instabilities in Collisionless Driven Reconnection, J. Plasma Phys., Volume 72 (2006) 929
R. Horiuchi and T. Sato, Three-dimensional particle simulation of plasma instabilities and collisionless reconnection in a current sheet, Physics of Plasmas Volume 6 (1999) 4565

Triggering Mechanism of Collisionless Reconnection

Two-dimensional particle simulation studies have revealed that there are two causes lead-ing to the excitation of collisionless reconnec-tion, i.e., anomalous resistivity generated by drift-kink instability, and pressure tensor effect originating from complex particle motion. Figure shows the current density profile when collisionless reconnection fully develops.

A. Ishizawa and R. Horiuchi, Suppression of Hall term effects by gyroviscous cancellation in steady collisionless magnetic reconnection, Physical Review Letters, Vol. 95, (2005), 045003
A. Ishizawa, R. Horiuchi, and H. Ohtani, Two-scale structure of the current layer controlled by meandering motion during steady-state collisionless driven reconnection, Physics of Plasmas, Vol. 11, (2004), 3579
W. Pei, R. Horiuchi and T. Sato, Ion Dynamics in Steady Collisionless Driven Reconnection, Phys. Rev. Lett., Volume 87 (2001), 235003
W. Pei, R. Horiuchi and T. Sato, Long Time Scale Evolution of Collisionless Driven Reconnection in a Two-Dimensional Open System, Phys. Plasmas, Volume 8 (2001), 3251,

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