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Role of Z-pinches in magnetic reconnection in space plasmas
KTH, School of Computer Science and Communication (CSC), High Performance Computing and Visualization (HPCViz).ORCID iD: 0000-0003-0639-0639
2015 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 81, no 1, 325810105Article in journal (Refereed) Published
Abstract [en]

A widely accepted scenario of magnetic reconnection in collisionless space plasmas is the breakage of magnetic field lines in X-points. In laboratory, reconnection is commonly studied in pinches, current channels embedded into twisted magnetic fields. No model of magnetic reconnection in space plasmas considers both nullpoints and pinches as peers. We have performed a particle-in-cell simulation of magnetic reconnection in a three-dimensional configuration where null-points are present initially, and Z-pinches are formed during the simulation along the lines of spiral null-points. The non-spiral null-points are more stable than spiral ones, and no substantial energy dissipation is associated with them. On the contrary, turbulent magnetic reconnection in the pinches causes the magnetic energy to decay at a rate of similar to 1.5% per ion gyro period. Dissipation in similar structures is a likely scenario in space plasmas with large fraction of spiral null-points.

Place, publisher, year, edition, pages
2015. Vol. 81, no 1, 325810105
Keyword [en]
Collisionless plasmas, Energy dissipation, Magnetic fields, Pinch effect, Plasma simulation, A-particles, Collisionless, Magnetic energies, Magnetic field line, Magnetic reconnections, Space plasmas, Substantial energy, Turbulent magnetic reconnections
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-166365DOI: 10.1017/S0022377814000725ISI: 000352193400013ScopusID: 2-s2.0-84921556147OAI: diva2:810593
EU, FP7, Seventh Framework Programme, 2633430

QC 20150507

Available from: 2015-05-07 Created: 2015-05-07 Last updated: 2015-05-07Bibliographically approved

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Markidis, Stefano
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