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    Magnetic reconnection and stochastic plasmoid chains in high-Lundquist-number plasmas

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    Type
    Article
    Authors
    Loureiro, N. F.
    Samtaney, Ravi cc
    Schekochihin, A. A.
    Uzdensky, D. A.
    KAUST Department
    Fluid and Plasma Simulation Group (FPS)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2012-04-14
    Online Publication Date
    2012-04-14
    Print Publication Date
    2012-04
    Permanent link to this record
    http://hdl.handle.net/10754/552788
    
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    Abstract
    A numerical study of magnetic reconnection in the large-Lundquist-number (S), plasmoid-dominated regime is carried out for S up to 10 7. The theoretical model of Uzdensky [Phys. Rev. Lett. 105, 235002 (2010)] is confirmed and partially amended. The normalized reconnection rate is Ẽ eff ∼ 0.02 independently of S for S ≫ 10 4. The plasmoid flux (ψ) and half-width (w x) distribution functions scale as f (ψ) ∼ - ψ -2 and f (w x) ∼ w x -2. The joint distribution of ψ and w x shows that plasmoids populate a triangular region w x ≲ψ/B 0, where B 0 is the reconnecting field. It is argued that this feature is due to plasmoid coalescence. Macroscopic "monster" plasmoids with w x ∼ 10 % of the system size are shown to emerge in just a few Alfvén times, independently of S, suggesting that large disruptive events are an inevitable feature of large-S reconnection. © 2012 American Institute of Physics.
    Citation
    Magnetic reconnection and stochastic plasmoid chains in high-Lundquist-number plasmas 2012, 19 (4):042303 Physics of Plasmas
    Publisher
    AIP Publishing
    Journal
    Physics of Plasmas
    DOI
    10.1063/1.3703318
    arXiv
    1108.4040
    Additional Links
    http://scitation.aip.org/content/aip/journal/pop/19/4/10.1063/1.3703318
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.3703318
    Scopus Count
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    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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