Nonlinear effects associated with dispersive Alfvén waves in plasmas

P K Shukla, L Stenflo, R Bingham, B Eliasson

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Large amplitude Alfvén waves are frequently found in magnetized space and laboratory plasmas. Our objective here is to discuss the linear and nonlinear properties of dispersive Alfvén waves (DAWs) in a uniform magnetoplasma. We first consider finite frequency (ω/ωci) and ion gyroradius effects on inertial and kinetic Alfvén waves, where ωci is the ion gyrofrequency. Next, we focus on nonlinear effects caused by DAWs. Such effects include plasma density enhancement and depression by the Alfvén wave ponderomotive force, electron Joule heating by the thermal Alfvén wave force, the generation of zonal flows due to the shear Alfvén wave mode couplings as well as the formation of localized Alfvénic structures and Alfvénic vortices. The relevance of our investigation to the appearance of nonlinear Alfvén waves in the Earth's auroral acceleration region, in the solar corona and in the large plasma device at UCLA is discussed.
LanguageEnglish
PagesB349-B358
Number of pages10
JournalPlasma Physics and Controlled Fusion
Volume46
Issue number12B
DOIs
Publication statusPublished - 17 Nov 2004

Fingerprint

magnetohydrodynamic waves
Plasmas
Magnetoplasma
Plasma devices
space laboratories
Joule heating
Plasma density
Shear waves
gyrofrequency
Ions
ponderomotive forces
space plasmas
solar corona
coupled modes
Vortex flow
plasma density
Earth (planet)
ions
vortices
Kinetics

Keywords

  • plasma
  • dispersive Alfvén waves
  • dispersion
  • electrons
  • magnetization
  • magnetohydrodynamics
  • nonlinear systems
  • plasma density
  • plasma devices
  • pressure effects
  • solar radiation

Cite this

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abstract = "Large amplitude Alfv{\'e}n waves are frequently found in magnetized space and laboratory plasmas. Our objective here is to discuss the linear and nonlinear properties of dispersive Alfv{\'e}n waves (DAWs) in a uniform magnetoplasma. We first consider finite frequency (ω/ωci) and ion gyroradius effects on inertial and kinetic Alfv{\'e}n waves, where ωci is the ion gyrofrequency. Next, we focus on nonlinear effects caused by DAWs. Such effects include plasma density enhancement and depression by the Alfv{\'e}n wave ponderomotive force, electron Joule heating by the thermal Alfv{\'e}n wave force, the generation of zonal flows due to the shear Alfv{\'e}n wave mode couplings as well as the formation of localized Alfv{\'e}nic structures and Alfv{\'e}nic vortices. The relevance of our investigation to the appearance of nonlinear Alfv{\'e}n waves in the Earth's auroral acceleration region, in the solar corona and in the large plasma device at UCLA is discussed.",
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Nonlinear effects associated with dispersive Alfvén waves in plasmas. / Shukla, P K; Stenflo, L; Bingham, R; Eliasson, B.

In: Plasma Physics and Controlled Fusion, Vol. 46, No. 12B, 17.11.2004, p. B349-B358.

Research output: Contribution to journalArticle

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AU - Stenflo, L

AU - Bingham, R

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AB - Large amplitude Alfvén waves are frequently found in magnetized space and laboratory plasmas. Our objective here is to discuss the linear and nonlinear properties of dispersive Alfvén waves (DAWs) in a uniform magnetoplasma. We first consider finite frequency (ω/ωci) and ion gyroradius effects on inertial and kinetic Alfvén waves, where ωci is the ion gyrofrequency. Next, we focus on nonlinear effects caused by DAWs. Such effects include plasma density enhancement and depression by the Alfvén wave ponderomotive force, electron Joule heating by the thermal Alfvén wave force, the generation of zonal flows due to the shear Alfvén wave mode couplings as well as the formation of localized Alfvénic structures and Alfvénic vortices. The relevance of our investigation to the appearance of nonlinear Alfvén waves in the Earth's auroral acceleration region, in the solar corona and in the large plasma device at UCLA is discussed.

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