Turbulence in Magnetized Pair Plasmas

Loureiro, Nuno F.; Boldyrev, Stanislav

doi:10.3847/2041-8213/aae483

Turbulence in Magnetized Pair Plasmas

Journal Article · Wed Oct 10 00:00:00 EDT 2018 · The Astrophysical Journal. Letters (Online)

DOI:https://doi.org/10.3847/2041-8213/aae483· OSTI ID:1612419

^[1]; Boldyrev, Stanislav ^[2]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; DOE/OSTI
Univ. of Wisconsin, Madison, WI (United States). Dept. of Physics; Space Science Inst., Boulder, CO (United States)

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 $${k}_{\perp }^{-8/3}$$ (or $${k}_{\perp }^{-3}$$, 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 $$\propto {k}_{\perp }^{-11/3}$$.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0016215

OSTI ID:: 1612419

Journal Information:: The Astrophysical Journal. Letters (Online), Journal Name: The Astrophysical Journal. Letters (Online) Journal Issue: 1 Vol. 866; ISSN 2041-8213

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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