Non-linear growth of double tearing mode: Explosive reconnection, plasmoid formation, and particle acceleration
| Autor: | H. Baty, Tohir Akramov |
|---|---|
| Přispěvatelé: | Observatoire astronomique de Strasbourg (ObAS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Explosive material Plasmoid Magnetic reconnection Mechanics Condensed Matter Physics 01 natural sciences Instability 010305 fluids & plasmas Particle acceleration Classical mechanics [SDU]Sciences of the Universe [physics] Physics::Plasma Physics Physics::Space Physics 0103 physical sciences Lundquist number Magnetohydrodynamics Test particle 010303 astronomy & astrophysics ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Physics of Plasmas Physics of Plasmas, American Institute of Physics, 2017, 24 (8), pp.082116. ⟨10.1063/1.5000273⟩ |
| ISSN: | 1089-7674 1070-664X |
| DOI: | 10.1063/1.5000273 |
| Popis: | The nonlinear evolution of double tearing modes (DTMs) is investigated within the framework of resistive magnetohydrodynamic (MHD) simulations in a two-dimensional Cartesian geometry. We have explored the explosive reconnection phase associated with the growth of the secondary structure-driven instability for a range of resistivity values. The time scale of the explosive phase (that is of order of a few Alfvenic time scales) is shown to be quasi-independent of the resistivity, even when fast growing plasmoids develop for the highest enough Lundquist number cases. Test particle accelerations are performed using the MHD explosive simulations as input parameters. Our results show that reconnection DTM dynamics is able to provide an efficient process for accelerating charged particles far beyond characteristic thermal velocities within the reconnection layers. The main acceleration mechanism is attributed to the strong inductive electric field generated by the island structure-driven instability, with an addi... |
| Databáze: | OpenAIRE |
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