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Numerical simulations of separatrix instabilities in collisionless magnetic reconnection
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: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 19, no 4, 042110- p.Article in journal (Refereed) Published
Abstract [en]

Electron scale dynamics of magnetic reconnection separatrix jets is studied in this paper. Instabilities developing in directions both parallel and perpendicular to the magnetic field are investigated. Implicit particle-in-cell simulations with realistic electron-to-ion mass ratio are complemented by a set of small scale high resolution runs having the separatrix force balance as the initial condition. A special numerical procedure is developed to introduce the force balance into the small scale runs. Simulations show the development of streaming instabilities and consequent formation of electron holes in the parallel direction. A new electron jet instability develops in the perpendicular direction. The instability is closely related to the electron MHD Kelvin-Helmholtz mode and is destabilized by a flow, perpendicular to magnetic field at the separatrix. Tearing instability of the separatrix electron jet is modulated strongly by the electron MHD Kelvin-Helmholtz mode.

Place, publisher, year, edition, pages
2012. Vol. 19, no 4, 042110- p.
Keyword [en]
Collisionless, Electron hole, Force balances, High resolution, Initial conditions, Jet instability, Kelvin-Helmholtz modes, Magnetic reconnections, Mass ratio, Numerical procedures, Particle-in-cell simulations, Separatrix, Small scale, Tearing instability, Magnetic fields, Magnetohydrodynamics, Sailing vessels, Electrons
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-98456DOI: 10.1063/1.3698621ISI: 000309592100010Scopus ID: 2-s2.0-84860456858OAI: oai:DiVA.org:kth-98456DiVA: diva2:537250
Funder
EU, European Research Council, 263340
Note

QC 20120626

Available from: 2012-06-26 Created: 2012-06-26 Last updated: 2017-12-07Bibliographically approved

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Markidis, Stefano

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