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Turbulence in Magnetized Pair Plasmas

Author(s)
Gomes Loureiro, Nuno F; Boldyrev, Stanislav
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Abstract
Alfvénic-type turbulence in strongly magnetized, low-beta pair plasmas is investigated. A coupled set of equations for the evolution of the magnetic and flow potentials are derived, covering both fluid and kinetic scales. In the fluid (magnetohydrodynamic) range those equations are the same as for electron–ion plasmas, so turbulence at those scales is expected to be of the Alfvénic nature, exhibiting critical balance, dynamic alignment, and transition to a tearing-mediated regime at small scales. The critical scale at which a transition to a tearing-mediated range occurs is derived, and the spectral slope in that range is predicted to be k-⁸/³ (or k-³, depending on details of the reconnecting configuration assumed). At scales below the electron (and positron) skin depth, it is argued that turbulence is dictated by a cascade of the inertial Alfvén wave, which we show to result in the magnetic energy spectrum [subscript]∞k-¹¹/³. ©2018 Keywords: magnetic fields; magnetic reconnection; plasmas; turbulence
Date issued
2018-10
URI
https://hdl.handle.net/1721.1/124347
Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Journal
Astrophysical Journal Letters
Publisher
American Astronomical Society
Citation
Loureiro, Nuno F., and Stanislav Boldyrev, "Turbulence in Magnetized Pair Plasmas." Astrophysical Journal Letters 866, 1 (2018): letter 14 doi 10.3847/2041-8213/aae483 ©2018 Author(s)
Version: Final published version
ISSN
2041-8213
2041-8205

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