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    Effective Resistivity in Relativistic Collisionless Reconnection

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    Authors
    Selvi, S.
    Porth, O.
    Ripperda, B.
    Bacchini, F.
    Sironi, L.
    Keppens, R.
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    Discipline
    Physical sciences
    Audience
    Scientific
    Date
    2023
    Metadata
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    Description
    Magnetic reconnection can power spectacular high-energy astrophysical phenomena by producing nonthermal energy distributions in highly magnetized regions around compact objects. By means of two-dimensional fully kinetic particle-in-cell (PIC) simulations, we investigate relativistic collisionless plasmoid-mediated reconnection in magnetically dominated pair plasmas with and without a guide field. In X-points, where diverging flows result in a nondiagonal thermal pressure tensor, a finite residence time for particles gives rise to a localized collisionless effective resistivity. Here, for the first time for relativistic reconnection in a fully developed plasmoid chain, we identify the mechanisms driving the nonideal electric field using a full Ohm law by means of a statistical analysis based on our PIC simulations. We show that the nonideal electric field is predominantly driven by gradients of nongyrotropic thermal pressures. We propose a kinetic physics motivated nonuniform effective resistivity model that is negligible on global scales and becomes significant only locally in X-points. It captures the properties of collisionless reconnection with the aim of mimicking its essentials in nonideal magnetohydrodynamic descriptions. This effective resistivity model provides a viable opportunity to design physically grounded global models for reconnection-powered high-energy emission.
    Citation
    Selvi, S.; Porth, O.; Ripperda, B.; Bacchini, F.; Sironi, L.; Keppens, R. (2023). Effective Resistivity in Relativistic Collisionless Reconnection. , The Astrophysical Journal, Vol. 950, Issue 2, A169, DOI: 10.3847/1538-4357/acd0b0.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/11047
    doi: http://dx.doi.org/10.3847/1538-4357/acd0b0
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    Type
    Article
    Peer-Review
    Yes
    Language
    eng
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