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Title: Parametric instabilities of parallel propagating incoherent Alfven waves in a finite ion beta plasma

Abstract

Large amplitude, low-frequency Alfven waves constitute one of the most essential elements of magnetohydrodynamic (MHD) turbulence in the fast solar wind. Due to small collisionless dissipation rates, the waves can propagate long distances and efficiently convey such macroscopic quantities as momentum, energy, and helicity. Since loading of such quantities is completed when the waves damp away, it is important to examine how the waves can dissipate in the solar wind. Among various possible dissipation processes of the Alfven waves, parametric instabilities have been believed to be important. In this paper, we numerically discuss the parametric instabilities of coherent/incoherent Alfven waves in a finite ion beta plasma using a one-dimensional hybrid (superparticle ions plus an electron massless fluid) simulation, in order to explain local production of sunward propagating Alfven waves, as suggested by Helios/Ulysses observation results. Parameter studies clarify the dependence of parametric instabilities of coherent/incoherent Alfven waves on the ion and electron beta ratio. Parametric instabilities of coherent Alfven waves in a finite ion beta plasma are vastly different from those in the cold ions (i.e., MHD and/or Hall-MHD systems), even if the collisionless damping of the Alfven waves are neglected. Further, ''nonlinearly driven'' modulational instability is important for themore » dissipation of incoherent Alfven waves in a finite ion beta plasma regardless of their polarization, since the ion kinetic effects let both the right-hand and left-hand polarized waves become unstable to the modulational instability. The present results suggest that, although the antisunward propagating dispersive Alfven waves are efficiently dissipated through the parametric instabilities in a finite ion beta plasma, these instabilities hardly produce the sunward propagating waves.« less

Authors:
; ;  [1]
  1. Department of Earth System Science and Technology, Kyushu University, 6-1, Kasuga-koen, Kasuga City, Fukuoka 816-8580 (Japan)
Publication Date:
OSTI Identifier:
21072683
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 14; Journal Issue: 12; Other Information: DOI: 10.1063/1.2824986; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALFVEN WAVES; AMPLITUDES; BETA RATIO; COMPUTERIZED SIMULATION; DAMPING; DISTANCE; ELECTRONS; FLUIDS; HELICITY; IONS; LET; MAGNETOHYDRODYNAMICS; PARAMETRIC INSTABILITIES; PLASMA; PLASMA SIMULATION; POLARIZATION; SOLAR WIND; TURBULENCE

Citation Formats

Nariyuki, Y, Hada, T, Tsubouchi, K, and National Institute of Information and Communications Technology, Koganei, Tokyo 184-8795. Parametric instabilities of parallel propagating incoherent Alfven waves in a finite ion beta plasma. United States: N. p., 2007. Web. doi:10.1063/1.2824986.
Nariyuki, Y, Hada, T, Tsubouchi, K, & National Institute of Information and Communications Technology, Koganei, Tokyo 184-8795. Parametric instabilities of parallel propagating incoherent Alfven waves in a finite ion beta plasma. United States. https://doi.org/10.1063/1.2824986
Nariyuki, Y, Hada, T, Tsubouchi, K, and National Institute of Information and Communications Technology, Koganei, Tokyo 184-8795. Sat . "Parametric instabilities of parallel propagating incoherent Alfven waves in a finite ion beta plasma". United States. https://doi.org/10.1063/1.2824986.
@article{osti_21072683,
title = {Parametric instabilities of parallel propagating incoherent Alfven waves in a finite ion beta plasma},
author = {Nariyuki, Y and Hada, T and Tsubouchi, K and National Institute of Information and Communications Technology, Koganei, Tokyo 184-8795},
abstractNote = {Large amplitude, low-frequency Alfven waves constitute one of the most essential elements of magnetohydrodynamic (MHD) turbulence in the fast solar wind. Due to small collisionless dissipation rates, the waves can propagate long distances and efficiently convey such macroscopic quantities as momentum, energy, and helicity. Since loading of such quantities is completed when the waves damp away, it is important to examine how the waves can dissipate in the solar wind. Among various possible dissipation processes of the Alfven waves, parametric instabilities have been believed to be important. In this paper, we numerically discuss the parametric instabilities of coherent/incoherent Alfven waves in a finite ion beta plasma using a one-dimensional hybrid (superparticle ions plus an electron massless fluid) simulation, in order to explain local production of sunward propagating Alfven waves, as suggested by Helios/Ulysses observation results. Parameter studies clarify the dependence of parametric instabilities of coherent/incoherent Alfven waves on the ion and electron beta ratio. Parametric instabilities of coherent Alfven waves in a finite ion beta plasma are vastly different from those in the cold ions (i.e., MHD and/or Hall-MHD systems), even if the collisionless damping of the Alfven waves are neglected. Further, ''nonlinearly driven'' modulational instability is important for the dissipation of incoherent Alfven waves in a finite ion beta plasma regardless of their polarization, since the ion kinetic effects let both the right-hand and left-hand polarized waves become unstable to the modulational instability. The present results suggest that, although the antisunward propagating dispersive Alfven waves are efficiently dissipated through the parametric instabilities in a finite ion beta plasma, these instabilities hardly produce the sunward propagating waves.},
doi = {10.1063/1.2824986},
url = {https://www.osti.gov/biblio/21072683}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 12,
volume = 14,
place = {United States},
year = {2007},
month = {12}
}