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Title: Dual Phase-space Cascades in 3D Hybrid-Vlasov–Maxwell Turbulence

Abstract

To explain energy dissipation via turbulence in collisionless, magnetized plasmas, the existence of a dual real- and velocity-space cascade of ion-entropy fluctuations below the ion gyroradius has been proposed. Such a dual cascade, predicted by the gyrokinetic theory, has previously been observed in gyrokinetic simulations of two-dimensional, electrostatic turbulence. For the first time we show evidence for a dual phase-space cascade of ion-entropy fluctuations in a three-dimensional simulation of hybrid-kinetic, electromagnetic turbulence. Some of the scalings observed in the energy spectra are consistent with a generalized theory for the cascade that accounts for the spectral anisotropy of critically balanced, intermittent, sub-ion-Larmor-scale fluctuations. Also, the observed velocity-space cascade is anisotropic with respect to the magnetic-field direction, with linear phase mixing along magnetic-field lines proceeding mainly at spatial scales above the ion gyroradius and nonlinear phase mixing across magnetic-field lines proceeding at perpendicular scales below the ion gyroradius. Such phase-space anisotropy could be sought in heliospheric and magnetospheric data of solar-wind turbulence and has far-reaching implications for the dissipation of turbulence in weakly collisional astrophysical plasmas.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences
  2. Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences; Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Univ. of Pisa (Italy). Enrico Fermi Physics Dept.
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE; CINECA consortium (Italy); National Aeronautic and Space Administration (NASA)
OSTI Identifier:
1432940
Grant/Contract Number:  
HP10BEANCY; NNX16AK09G
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters
Additional Journal Information:
Journal Volume: 856; Journal Issue: 1; Journal ID: ISSN 2041-8213
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; methods: numerical; plasmas; solar wind; turbulence

Citation Formats

Cerri, S. S., Kunz, M. W., and Califano, F. Dual Phase-space Cascades in 3D Hybrid-Vlasov–Maxwell Turbulence. United States: N. p., 2018. Web. doi:10.3847/2041-8213/aab557.
Cerri, S. S., Kunz, M. W., & Califano, F. Dual Phase-space Cascades in 3D Hybrid-Vlasov–Maxwell Turbulence. United States. doi:10.3847/2041-8213/aab557.
Cerri, S. S., Kunz, M. W., and Califano, F. Fri . "Dual Phase-space Cascades in 3D Hybrid-Vlasov–Maxwell Turbulence". United States. doi:10.3847/2041-8213/aab557. https://www.osti.gov/servlets/purl/1432940.
@article{osti_1432940,
title = {Dual Phase-space Cascades in 3D Hybrid-Vlasov–Maxwell Turbulence},
author = {Cerri, S. S. and Kunz, M. W. and Califano, F.},
abstractNote = {To explain energy dissipation via turbulence in collisionless, magnetized plasmas, the existence of a dual real- and velocity-space cascade of ion-entropy fluctuations below the ion gyroradius has been proposed. Such a dual cascade, predicted by the gyrokinetic theory, has previously been observed in gyrokinetic simulations of two-dimensional, electrostatic turbulence. For the first time we show evidence for a dual phase-space cascade of ion-entropy fluctuations in a three-dimensional simulation of hybrid-kinetic, electromagnetic turbulence. Some of the scalings observed in the energy spectra are consistent with a generalized theory for the cascade that accounts for the spectral anisotropy of critically balanced, intermittent, sub-ion-Larmor-scale fluctuations. Also, the observed velocity-space cascade is anisotropic with respect to the magnetic-field direction, with linear phase mixing along magnetic-field lines proceeding mainly at spatial scales above the ion gyroradius and nonlinear phase mixing across magnetic-field lines proceeding at perpendicular scales below the ion gyroradius. Such phase-space anisotropy could be sought in heliospheric and magnetospheric data of solar-wind turbulence and has far-reaching implications for the dissipation of turbulence in weakly collisional astrophysical plasmas.},
doi = {10.3847/2041-8213/aab557},
journal = {The Astrophysical Journal. Letters},
number = 1,
volume = 856,
place = {United States},
year = {2018},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 7 works
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Figures / Tables:

Figure 1 Figure 1: Energy spectra of the perpendicular electric field EE⊥ (red solid line), the perpendicular magnetic field EB⊥ (blue solid line), the parallel magnetic-field fluctuations EB‖ (light-blue solid line), and the non-thermal entropy fluctuations E$\delta$ε (orange solid line), all versus k. Insets report the same spectra versus k. Labelled dashedmore » and dot-dashed lines provide reference slopes.« less

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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.