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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union

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Nonlin. Processes Geophys., 19, 145-153, 2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
27 Feb 2012
Collisionless magnetic reconnection in a plasmoid chain
S. Markidis1,2, P. Henri1, G. Lapenta1, A. Divin1, M. V. Goldman3, D. Newman3, and S. Eriksson4 1Centrum voor Plasma-Astrofysica, Departement Wiskunde, Katholieke Universiteit Leuven, Belgium
2PDC Center for High Performance Computing, KTH Royal Institute of Technology, Stockholm, Sweden
3Department of Physics and CIPS, University of Colorado, Boulder, Colorado 80309, USA
4Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80309, USA
Abstract. The kinetic features of plasmoid chain formation and evolution are investigated by two dimensional Particle-in-Cell simulations. Magnetic reconnection is initiated in multiple X points by the tearing instability. Plasmoids form and grow in size by continuously coalescing. Each chain plasmoid exhibits a strong out-of plane core magnetic field and an out-of-plane electron current that drives the coalescing process. The disappearance of the X points in the coalescence process are due to anti-reconnection, a magnetic reconnection where the plasma inflow and outflow are reversed with respect to the original reconnection flow pattern. Anti-reconnection is characterized by the Hall magnetic field quadrupole signature. Two new kinetic features, not reported by previous studies of plasmoid chain evolution, are here revealed. First, intense electric fields develop in-plane normally to the separatrices and drive the ion dynamics in the plasmoids. Second, several bipolar electric field structures are localized in proximity of the plasmoid chain. The analysis of the electron distribution function and phase space reveals the presence of counter-streaming electron beams, unstable to the two stream instability, and phase space electron holes along the reconnection separatrices.

Citation: Markidis, S., Henri, P., Lapenta, G., Divin, A., Goldman, M. V., Newman, D., and Eriksson, S.: Collisionless magnetic reconnection in a plasmoid chain, Nonlin. Processes Geophys., 19, 145-153,, 2012.
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