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Fully Kinetic Simulation of 3D Kinetic Alfvén Turbulence

Author(s)
Grošelj, Daniel; Mallet, Alfred; Jenko, Frank; Gomes Loureiro, Nuno F
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Abstract
We present results from a three-dimensional particle-in-cell simulation of plasma turbulence, resembling the plasma conditions found at kinetic scales of the solar wind. The spectral properties of the turbulence in the subion range are consistent with theoretical expectations for kinetic Alfvén waves. Furthermore, we calculate the local anisotropy, defined by the relation k∥(k⊥), where k∥ is a characteristic wave number along the local mean magnetic field at perpendicular scale l⊥∼1/k⊥. The subion range anisotropy is scale dependent with k∥<k⊥ and the ratio of linear to nonlinear time scales is of order unity, suggesting that the kinetic cascade is close to a state of critical balance. Our results compare favorably against a number of in situ solar wind observations and demonstrate—from first principles—the feasibility of plasma turbulence models based on a critically balanced cascade of kinetic Alfvén waves.
Date issued
2018-03
URI
http://hdl.handle.net/1721.1/117845
Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Grošelj, Daniel et al. “Fully Kinetic Simulation of 3D Kinetic Alfvén Turbulence.” Physical Review Letters 120, 10 (March 2018): 105101 © 2018 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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