Non-propagating electric and density structures formed through non-linear interaction of Alfvén waves

Mottez, Fabrice

doi:10.5194/angeo-30-81-2012

Cited by 8 publications

(26 citation statements)

References 48 publications

(55 reference statements)

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“…As displayed in Figure a, the maximum bc (black dashed circle) is just located at k A + V Ae /Ω e ≈ 0.74, k A − V Ae /Ω e ≈ − 0.74, and k Ex V Ae /Ω e ≈ 1.48, with bc max ≈ 0.55, meaning there is a strong coupling process among two counter‐propagating whistler mode waves and electrostatic standing structures with k Ex = k A + − k A − = 2 k A + satisfied. This phenomenon is similar to that reported in previous works about ion cyclotron waves (Guo, ; Mottez, ). Figure b shows a strong coupling among k A + V Ae /Ω e ≈ 0.73, k Ex V Ae /Ω e ≈ 1.40, and k B + V Ae /Ω e ≈ 2.13, with bc max ≈ 0.52 (white dashed circle).…”

Section: Simulation Resultssupporting

confidence: 92%

Nonlinear Evolution of Counter‐Propagating Whistler Mode Waves Excited by Anisotropic Electrons Within the Equatorial Source Region: 1‐D PIC Simulations

Chen

Gao

et al. 2018

JGR Space Physics

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Nonlinear physical processes related to whistler mode waves are attracting more and more attention for their significant role in reshaping whistler mode spectra in the Earth's magnetosphere. Using a 1‐D particle‐in‐cell simulation model, we have investigated the nonlinear evolution of parallel counter‐propagating whistler mode waves excited by anisotropic electrons within the equatorial source region. In our simulations, after the linear phase of whistler mode instability, the strong electrostatic standing structures along the background magnetic field will be formed, resulting from the coupling between excited counter‐propagating whistler mode waves. The wave numbers of electrostatic standing structures are about twice those of whistler mode waves generated by anisotropic hot electrons. Moreover, these electrostatic standing structures can further be coupled with either parallel or antiparallel propagating whistler mode waves to excite high‐k modes in this plasma system. Compared with excited whistler mode waves, these high‐k modes typically have 3 times wave number, same frequency, and about 2 orders of magnitude smaller amplitude. Our study may provide a fresh view on the evolution of whistler mode waves within their equatorial source regions in the Earth's magnetosphere.

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Section: Simulation Resultssupporting

confidence: 92%

Nonlinear Evolution of Counter‐Propagating Whistler Mode Waves Excited by Anisotropic Electrons Within the Equatorial Source Region: 1‐D PIC Simulations

Chen

Gao

et al. 2018

JGR Space Physics

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“…Eq. (3.6) fits the electric field E X found with the simulations presented in (Mottez 2012a) as well as the simulations attached to the present work. This point was analysed in details in (Mottez 2012a) and we do not repeat the analysis here.…”

Section: Properties Of the Electromagnetic Fieldsupporting

confidence: 82%

“…Therefore, there is no gradient, and no parallel particle acceleration at all. This case was tested with the simulation AWC011 in (Mottez 2012a). The electric field in AWC011 was purely time dependent, in accordance with Eq.…”

Section: Particle Acceleration Along the Mean Magnetic Field Directionmentioning

confidence: 99%

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Plasma acceleration by the interaction of parallel propagating Alfvén waves

Mottez

2014

J. Plasma Phys.

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It is shown that two circularly polarised Alfvén waves that propagate along the ambient magnetic field in an uniform plasma trigger non oscillating electromagnetic field components when they cross each other. The non-oscilliating field components can accelerate ions and electrons with great efficiency. This work is based on particle-in-cell (PIC) numerical simulations and on analytical non-linear computations. The analytical computations are done for two counter-propagating monochromatic waves. The simulations are done with monochromatic waves and with wave packets. The simulations show parallel electromagnetic fields consistent with the theory, and they show that the particle acceleration result in plasma cavities and, if the waves amplitudes are high enough, in ion beams. These acceleration processes could be relevant in space plasmas. For instance, they could be at work in the auroral zone and in the radiation belts of the Earth magnetosphere. In particular, they may explain the origin of the deep plasma cavities observed in the Earth auroral zone.

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“…Hence, the presented model which is based on the nonlinear interaction and takes into account the parallel field is more feasible in comparison to other models. Nonlinear processes associated with the Alfvén waves are believed to be the key candidate responsible for these observed auroral phenomena [ Chaston et al ., ; Mottez , ; Singh et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Density cavity formation through nonlinear interaction of 3‐D inertial Alfvén wave and ion acoustic wave

2014

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Density cavities having transverse-scale size of the order of electron inertial length have been observed in auroral ionosphere by Freja spacecraft. In the present study, density cavity formation in auroral regions has been investigated using numerical simulation techniques. Nonlinear interaction of inertial Alfvén waves and ion acoustic waves has been suggested as a possible mechanism to apprehend density cavity formation in auroral regions. In the proposed mechanism, strong modification in the density profile takes place due to the ponderomotive force of inertial Alfvén waves and accounts for these density depleted regions. In literature also, it has been demonstrated that these cavities are associated with the ponderomotive forces of inertial Alfvén wave. Our presented model also attempts to understand the salient features of auroral density cavities which are reported in literature from the analysis of data available from FAST spacecraft. Relevance of obtained results with observations in auroral ionosphere has also been discussed.

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Non-propagating electric and density structures formed through non-linear interaction of Alfvén waves

Cited by 8 publications

References 48 publications

Nonlinear Evolution of Counter‐Propagating Whistler Mode Waves Excited by Anisotropic Electrons Within the Equatorial Source Region: 1‐D PIC Simulations

Nonlinear Evolution of Counter‐Propagating Whistler Mode Waves Excited by Anisotropic Electrons Within the Equatorial Source Region: 1‐D PIC Simulations

Plasma acceleration by the interaction of parallel propagating Alfvén waves

Density cavity formation through nonlinear interaction of 3‐D inertial Alfvén wave and ion acoustic wave

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