Three-dimensional Simulations and Spacecraft Observations of Sub-ion Scale Turbulence in the Solar Wind: Influence of Landau Damping

S. Kobayashi 1 F. Sahraoui 1 T. Passot 2 D. Laveder 2 P. Sulem 2 S. Y. Huang 3 Pierre Henri 4 R. Smets 2
1 LPP - Laboratoire de Physique des Plasmas
2 LAGRANGE - Joseph Louis LAGRANGE
3 School of Electronic Information [Wuhan]
4 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
Abstract : Three-dimensional nonlinear finite Larmor radius (FLR)–Landau fluid simulations, which include some small-scale $({k}_{\perp }{\rho }_{i}\gtrsim 1)$ kinetic effects, are performed to explore the nature of the sub-ion scale turbulence in the solar wind and to investigate the role of Landau damping and FLR corrections. The resulting steady-state magnetic power spectrum in the dispersive range display exponents that vary within a range of values compatible with statistical results reported from in situ spacecraft measurements of solar wind turbulence as well as from gyrokinetic simulations. The spectral slopes are shown to depend on the strength of the nonlinear effects and on the scale at which turbulent fluctuations are driven in the simulations. The influence of Landau damping is addressed by comparison with simulations where the double-adiabatic closure is imposed. The role of FLR corrections is also analyzed. Comparison with in situ observations in the solar wind are performed to enlighten the influence of the fluctuations power at different scales on the spectral slopes in the sub-ion range. Using diagnosis of both magnetic compressibility and frequency-wavenumber spectra, it is shown that in spite of the evidence of the presence of fast-magnetosonic modes, the magnetic energy is mostly distributed around the kinetic Alfvén waves and the slow modes, in agreement with solar wind measurements. The observed large broadening about the linear dispersion relations may reflect the presence of coherent structures.
Keywords : acceleration of particles turbulence plasmas magnetohydrodynamics (MHD) magnetic fields solar wind
Document type :
Journal articles
Complete list of metadatas

Cited literature [69 references]  Display  Hide  Download
https://hal-insu.archives-ouvertes.fr/insu-01670788
Contributor : Nathalie Rouchon <>
Submitted on : Thursday, December 20, 2018 - 4:14:48 PM
Last modification on : Thursday, July 25, 2019 - 4:16:03 PM
Long-term archiving on : Friday, March 22, 2019 - 9:56:35 AM

File

Kobayashi_2017_ApJ_839_122.pdf
Publisher files allowed on an open archive

Identifiers

Collections

INSU | OBSPM | OSUC | LAGRANGE | PSL | UNIV-PARIS-SACLAY | UNIV-COTEDAZUR | PARISTECH | X-DEP-PHYS | UNICE | X | UNIV-ORLEANS | OCA | LPC2E | SORBONNE-UNIVERSITE | X-LPP | SU-SCIENCES | SIGAMM

Citation

S. Kobayashi, F. Sahraoui, T. Passot, D. Laveder, P. Sulem, et al.. Three-dimensional Simulations and Spacecraft Observations of Sub-ion Scale Turbulence in the Solar Wind: Influence of Landau Damping. The Astrophysical Journal, American Astronomical Society, 2017, 839 (2), pp.122. ⟨10.3847/1538-4357/aa67f2⟩. ⟨insu-01670788⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

243

Files downloads

103

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD