Three-Dimensional Mode Conversion Associated with Kinetic Alfvén Waves

Lin, Y.; Johnson, Jay R.; Wang, Xueyi

doi:10.1103/physrevlett.109.125003

Cited by 62 publications

(74 citation statements)

References 35 publications

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“…(20) indicates that the KAW decay process maximizes around θ ±π/2; i.e., k 0⊥ ⊥ k −⊥ , and |k ⊥ ρ i | ∼ O(1). Both predictions have recently been observed in numerical simulations [42].…”

Section: Nonlinear Wave-wave Interactionssupporting

confidence: 67%

Physics of Alfvén Waves

Chen

Zonca

2014

Proceedings of the 12th Asia Pacific Physics Conference (APPC12)

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Alfvén waves discovered by Hannes Alfvén (1942, Nature 150 405) are fundamental electromagnetic oscillations prevalent in magnetically confined plasmas existing in the nature and laboratories. Alfvén waves play important roles in the heating, stability, and transport of magnetized plasmas. The anisotropic nearly incompressible shear Alfvén wave is particularly interesting since, due to inhomogeneities and geometries in realistic plasmas, its wave spectra consist of both the regular discrete and the singular continuous components. In this paper, we will discuss interesting features of the spectral properties of Alfvén waves, spontaneous wave excitations via resonance with supra-thermal particles, and nonlinear physics issues dealing with both wave-particle as well as wave-wave interactions.

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Section: Nonlinear Wave-wave Interactionssupporting

confidence: 67%

Physics of Alfvén Waves

Chen

Zonca

2014

Proceedings of the 12th Asia Pacific Physics Conference (APPC12)

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“…Both predictions have recently been observed in numerical simulations. 30 Equations (21) and (25) indicate that the decay instabilities are quantitatively and qualitatively different in the MHD and kinetic regimes. Specifically, we note that…”

Section: Finite Ion Compressibility and Parametric Decaysmentioning

confidence: 99%

On nonlinear physics of shear Alfvén waves

Chen

Zonca

2013

Physics of Plasmas

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Shear Alfv en waves (SAW) are electromagnetic oscillations prevalent in laboratory and nature magnetized plasmas. Due to their anisotropic nature, it is well known that the linear wave propagation and dispersiveness of SAW are fundamentally affected by plasma nonuniformities and magnetic field geometries, such as the existence of continuous spectrum, spectral gaps, and discrete eigenmodes in toroidal plasmas. This work discusses the pure Alfv enic state and demonstrates the crucial roles that finite ion compressibility, non-ideal kinetic effects, and geometry play in breaking it and, thereby, the nonlinear physics of SAW wave-wave interactions. V C 2013 AIP Publishing LLC.

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“…46 Furthermore, the 2-D global hybrid model was used by Hong, Swift, and Lin 47 to study the ion dynamics associated with Alfven waves in the near-Earth magnetotail. Recently, Lin, Johnson, and Wang 21,22 investigated the mode conversion and structure of KAWs around the magnetopause boundary layer with both 2-D and 3-D hybrid simulations. Meanwhile, the generation of KAWs in the global magnetotail has not been addressed, although a 2-D hybrid simulation has already been utilized to investigate the generation of KAWs in a non-uniform magnetospheric plasma boundary layer.…”

Section: Introductionmentioning

confidence: 99%

“…It has been suggested that KAWs can be generated through mode conversion, 1,5,[20][21][22] phase mixing, 6,23,24 resonant absorption, 11,25 velocity shear, 26,27 etc. Hasegawa 1 proposed that MHD surface waves could couple to KAWs via an interaction with the density gradient at the plasma sheet-tail lobe boundary.…”

Section: Introductionmentioning

confidence: 99%

Generation of kinetic Alfven waves in the high-latitude near-Earth magnetotail: A global hybrid simulation

et al. 2015

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In this paper, effects of a fast flow in the tail plasma sheet on the generation of kinetic Alfven waves (KAWs) in the high-latitude of the near-Earth magnetotail are investigated by performing a two-dimensional (2-D) global-scale hybrid simulation, where the plasma flow is initialized by the E Â B drift near the equatorial plane due to the existence of the dawn-dusk convection electric field. It is found that firstly, the plasma sheet becomes thinned and the dipolarization of magnetic field appears around ðx; zÞ ¼ ðÀ10:5R E ; 0:3R E Þ, where R E is the radius of the Earth. Then, shear Alfven waves are excited in the plasma sheet, and the strong earthward flow is braked by the dipole-like magnetic field. These waves propagate along the magnetic field lines toward the polar regions later. Subsequently, KAWs with k ? ) k k are generated in the high-latitude magnetotail due to the existence of the non-uniformity of the magnetic field and density in the polar regions. The ratio of the electric field to the magnetic field in these waves is found to obey the relation ðdE z Þ=ðdB y Þ $ x=k k of KAWs. Our simulation provides a mechanism for the generation of the observed low-frequency shear Alfven waves in the plasma sheet and kinetic Alfven waves in the high-latitude near-Earth magnetotail, whose source is suggested to be the flow braking in the lowlatitude plasma sheet. V C 2015 AIP Publishing LLC. [http://dx.

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Three-Dimensional Mode Conversion Associated with Kinetic Alfvén Waves

Cited by 62 publications

References 35 publications

Physics of Alfvén Waves

Physics of Alfvén Waves

On nonlinear physics of shear Alfvén waves

Generation of kinetic Alfven waves in the high-latitude near-Earth magnetotail: A global hybrid simulation

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