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Collisionless magnetic reconnection in a plasmoid chain
KTH, School of Computer Science and Communication (CSC), Centres, Centre for High Performance Computing, PDC.ORCID iD: 0000-0003-0639-0639
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2012 (English)In: Nonlinear processes in geophysics, ISSN 1023-5809, E-ISSN 1607-7946, Vol. 19, no 1, 145-153 p.Article in journal (Refereed) Published
Abstract [en]

The kinetic features of plasmoid chain formation and evolution are investigated by two dimensional Particlein-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.

Place, publisher, year, edition, pages
2012. Vol. 19, no 1, 145-153 p.
National Category
Geochemistry Geophysics
URN: urn:nbn:se:kth:diva-92073DOI: 10.5194/npg-19-145-2012ISI: 000300884000012ScopusID: 2-s2.0-84866927086OAI: diva2:512024
QC 20120326Available from: 2012-03-26 Created: 2012-03-26 Last updated: 2012-03-26Bibliographically approved

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Markidis, Stefano
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