Electron Bernstein-Greene-Kruskal hole for obliquely propagating solitary kinetic Alfvén waves

Woo, M.H.; Dokgo, K.; Yoon, Peter H.; Lee, D.-Y.; Choi, Chang‐Shik

doi:10.1063/1.4979905

Cited by 3 publications

(3 citation statements)

References 35 publications

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“…The study of nonlinear structures of dispersive Alfvén waves in magnetized plasmas holds great significance because they can play an important role in explaining electromagnetic fluctuations, particle accelerations and solitary structures occurring in space, astrophysical and laboratory plasmas [16]. In the context of different space and astrophysical situations, a number articles [17][18][19][20] on dispersive Alfvén waves have been published recently.…”

Section: Introductionmentioning

confidence: 99%

Solitary kinetic Alfvén waves in a dense electron–positron–ion plasma with degenerate electrons and positrons

Ahmed¹,

Sah²

2017

Plasma Sci. Technol.

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Through the use of a reductive perturbation technique, solitary kinetic Alfvén waves (KAWs) are investigated in a low but finite b (particle-to-magnetic pressure ratio) dense electron-positron-ion plasma where electrons and positrons are degenerate. The degenerate plasma model considered here permits the existence of sub-Alfvénic compressive solitary KAWs. The influence of r (equilibrium positron-to-ion density ratio), s F (electron-to-positron Fermi temperature ratio), b and obliqueness parameter l z on various characteristics of solitary KAWs are examined through numerical plots. We have shown that there exists a critical value of l z at which a soliton width attains its maximum value which decreases with an increase in r and s. F It is also found that solitons with a higher energy propagate more obliquely in the direction of an ambient magnetic field. The results of the present investigation may be useful for understanding low frequency nonlinear electromagnetic wave propagation in magnetized electron-positron-ion plasmas in dense stars. Specifically, the relevance of our investigation to a pulsar magnetosphere is emphasized.

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Section: Introductionmentioning

confidence: 99%

Solitary kinetic Alfvén waves in a dense electron–positron–ion plasma with degenerate electrons and positrons

Ahmed¹,

Sah²

2017

Plasma Sci. Technol.

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“…The question is thus raised of whether electrostatic solitons may actually develop in electron-positron plasmas with inertia symmetry (see, e.g., Refs. [5][6][7][8]). Based on electrostatic particle simulations along with fluid theory we have recently demonstrated the formation of pair solitons with interlacing positive and negative electric potentials via electron and positron beams streaming in background stationary electron and positron plasmas [9,10].…”

Section: Introductionmentioning

confidence: 99%

Electrostatic solitons and Alfvén waves generated by streaming instability in electron-positron plasmas

Jao

Hau

2018

Phys. Rev. E

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Electron-positron plasmas may be present in laboratory experiments and certain astrophysical environments. Due to the inertia symmetry there have been some debates about whether the nonlinear electrostatic solitons generated easily in electron-proton plasmas may develop in electron-positron plasmas. In this study we show the formation of electrostatic solitons and electromagnetic Alfvén waves in extensive magnetized electron-positron plasma system generated by streaming instabilities based on electromagnetic particle simulations along with fluid theory analyses. In particular, the four-component beam-plasma system may lead to the formation of interlacing electron and positron solitons in the early evolution stage (say, t<20ω_{p}^{-1}, where ω_{p}^{} is the plasma frequency) and large-amplitude Alfvén waves in the later phase (say, t>150ω_{p}^{-1}). The magnetic-field perturbations are generated by the beam and firehose-type instabilities associated with temperature anisotropy of T_{∥}>T_{⊥} resulting from the parallel plasma heating by the electrostatic instability. It is shown that the growth rates and the dominant wavelengths of both electrostatic and electromagnetic instabilities are consistent with the fluid theory. The coexistence of electrostatic solitons and electromagnetic Alfvén waves with significant magnetic field fluctuations in the same system is a unique feature of electron-positron plasmas and the unified theory behind the formation mechanisms is well addressed in the paper.

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“…It has been shown that such low-frequency (compared to the ion-cyclotron frequency) KAWs can evolve into intermediate shocks due to the anomalous dissipation, Alfvénic solitons and magnetic kink that are relevant in the solar wind for acceleration of charged particles [8]. Furthermore, the dispersion properties of KAWs and the formation of localized structures, as well as the onset of turbulence have been investigated owing to their applications in space and astrophysical plasmas [2,[9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Modulation of kinetic Alfvén waves in an intermediate low-beta magnetoplasma

Chatterjee

Misra

2018

Physics of Plasmas

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We study the amplitude modulation of nonlinear kinetic Alfvén waves (KAWs) in an intermediate low-beta magnetoplasma. Starting from a set of fluid equations coupled to the Maxwell's equations, we derive a coupled set of nonlinear partial differential equations (PDEs) which govern the evolution of KAW envelopes in the plasma. The modulational instability (MI) of such KAW envelopes is then studied by a nonlinear Schrödinger (NLS) equation derived from the coupled PDEs. It is shown that the KAWs can evolve into bright envelope solitons, or can undergo damping depending on whether the characteristic ratio (α) of the Alfvén to ion-acoustic (IA) speeds remains above or below a critical value. The parameter α is also found to shift the MI domains around the kxkz plane, where kx (kz) is the KAW number perpendicular (parallel) to the external magnetic field. The growth rate of MI, as well as the frequency shift and the energy transfer rate, are obtained and analyzed. The results can be useful for understanding the existence and formation of bright and dark envelope solitons, or damping of KAW envelopes in space plasmas, e.g., interplanetary space, solar winds etc.

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Electron Bernstein-Greene-Kruskal hole for obliquely propagating solitary kinetic Alfvén waves

Cited by 3 publications

References 35 publications

Solitary kinetic Alfvén waves in a dense electron–positron–ion plasma with degenerate electrons and positrons

Solitary kinetic Alfvén waves in a dense electron–positron–ion plasma with degenerate electrons and positrons

Electrostatic solitons and Alfvén waves generated by streaming instability in electron-positron plasmas

Modulation of kinetic Alfvén waves in an intermediate low-beta magnetoplasma

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