CRITICAL DIFFERENCES of ASYMMETRIC MAGNETIC RECONNECTION from STANDARD MODELS

S. Nitta, T. Wada, T. Fuchida, K. Kondoh

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    We have clarified the structure of asymmetric magnetic reconnection in detail as the result of the spontaneous evolutionary process. The asymmetry is imposed as ratio k of the magnetic field strength in both sides of the initial current sheet (CS) in the isothermal equilibrium. The MHD simulation is carried out by the HLLD code for the long-term temporal evolution with very high spatial resolution. The resultant structure is drastically different from the symmetric case (e.g., the Petschek model) even for slight asymmetry k = 2. (1) The velocity distribution in the reconnection jet clearly shows a two-layered structure, i.e., the high-speed sub-layer in which the flow is almost field aligned and the acceleration sub-layer. (2) Higher beta side (HBS) plasma is caught in a lower beta side plasmoid. This suggests a new plasma mixing process in the reconnection events. (3) A new large strong fast shock in front of the plasmoid forms in the HBS. This can be a new particle acceleration site in the reconnection system. These critical properties that have not been reported in previous works suggest that we contribute to a better and more detailed knowledge of the reconnection of the standard model for the symmetric magnetic reconnection system.

    Original languageEnglish
    Article number63
    JournalAstrophysical Journal
    Volume828
    Issue number1
    DOIs
    Publication statusPublished - 2016 Sep 1

    Keywords

    • Sun: flares
    • acceleration of particles
    • dynamo
    • magnetic reconnection
    • magnetohydrodynamics (MHD)
    • shock waves

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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