scholarly journals Finite amplitude electron-acoustic waves in the electron diffusion region

2021 ◽  
pp. 104041
Author(s):  
Odutayo R. Rufai ◽  
George V. Khazanov ◽  
S.V. Singh
Keyword(s):  
Acoustic Waves ◽  
Finite Amplitude ◽  
Diffusion Region ◽  
Electron Diffusion ◽  
Electron Acoustic Waves ◽  
Electron Acoustic

Parametric drive of vortex and magnetostatic modes in a strongly non-isothermal plasma

1982 ◽  
Vol 27 (2) ◽  
pp. 295-301
Author(s):  
H. U. Rahman ◽  
P. K. Shukla ◽  
G. Murtaza
Keyword(s):  
Acoustic Waves ◽  
Finite Amplitude ◽  
Magnetic Field Fluctuation ◽  
Ion Drift ◽  
Electron Acoustic Waves ◽  
Isothermal Plasma ◽  
Modulational Instabilities ◽  
Electron Acoustic ◽  
Magnetostatic Modes ◽  
Zero Frequency

SummaryIn this paper, we have discussed the possibility of excitation of zero-frequency modes by a finite-amplitude electron-sound wave in a highly non-isothermal (Ti ≫ Te) magnetoplasma. According to our investigation, the modulational instabilities of the electron-acoustic waves may produce enhanced twodimensional vortices (convection cells) and magnetic field fluctuation. Both of them can, in turn, modify transport properties of a hot magnetoplasma.Our results could be applicable to plasmas in the earth's magnetotail (Frank, Ackerson & Lepping 1976) or thetapinches, both of which have Ti≫Te. However, for thetapinch application, one should actually modify our results to include plasma non-uniformities. In such a situation, instead of electron-acoustic waves, one encounters ion drift waves (e.g. Shukla, Yu & Varma 1981) whose modulational instabilities can readily be studied following the procedure discussed here.Owing to the lack of experimental data, we cannot at present verify predictions of our theory for plasmas either in space or in a laboratory. However, a typical example shows that the growth rates of both the convection cells and the magnetostatic modes are quite substantial. Hence, the phenomena discussed here may indeed appear in nature.We are grateful to Ming Yu for many useful discussions. The work of one of us(P. K. S.) was performed under the auspices of the Sonderforschungsbereich Plasmaphysik Bochum/J ülich. One of us (H.U.R.) thanks the Deutsche Akademische Austauschdienst for the award of a fellowship.

scholarly journals Excitation of electron acoustic waves near the electron plasma frequency and at twice the plasma frequency

2000 ◽  
Vol 105 (A6) ◽  
pp. 12919-12927 ◽  
Author(s):  
D. Schriver ◽  
M. Ashour-Abdalla ◽  
V. Sotnikov ◽  
P. Hellinger ◽  
V. Fiala ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Plasma Frequency ◽  
Electron Plasma ◽  
Electron Plasma Frequency ◽  
Electron Acoustic Waves ◽  
Electron Acoustic

Two-soliton and three-soliton interactions of electron acoustic waves in quantum plasma

Pramana ◽  
2015 ◽  
Vol 86 (4) ◽  
pp. 873-883 ◽  
Author(s):  
KAUSHIK ROY ◽  
SWAPAN KUMAR GHOSH ◽  
PRASANTA CHATTERJEE
Keyword(s):  
Acoustic Waves ◽  
Quantum Plasma ◽  
Soliton Interactions ◽  
Electron Acoustic Waves ◽  
Electron Acoustic

Oblique propagating extraordinary spin-electron acoustic waves

2018 ◽  
Vol 25 (10) ◽  
pp. 102115 ◽  
Author(s):  
Pavel A. Andreev ◽  
S. V. Kolesnikov
Keyword(s):  
Acoustic Waves ◽  
Electron Acoustic Waves ◽  
Electron Acoustic

scholarly journals Plasma wave mediated attractive potentials: a prerequisite for electron compound formation

2014 ◽  
Vol 32 (8) ◽  
pp. 975-989 ◽  
Author(s):  
R. A. Treumann ◽  
W. Baumjohann
Keyword(s):  
Acoustic Waves ◽  
Attractive Potential ◽  
Necessary Condition ◽  
Lower Hybrid ◽  
Compound Formation ◽  
Electron Acoustic Waves ◽  
Heavy Electron ◽  
Electron Acoustic ◽  
Electron Compounds ◽  
Electron Compound

Abstract. Coagulation of electrons to form macro-electrons or compounds in high temperature plasma is not generally expected to occur. Here we investigate, based on earlier work, the possibility for such electron compound formation (non-quantum "pairing") mediated in the presence of various kinds of plasma waves via the generation of attractive electrostatic potentials, the necessary condition for coagulation. We confirm the possibility of production of attractive potential forces in ion- and electron-acoustic waves, pointing out the importance of the former and expected consequences. While electron-acoustic waves presumably do not play any role, ion-acoustic waves may potentially contribute to formation of heavy electron compounds. Lower-hybrid waves also mediate compound formation but under different conditions. Buneman modes which evolve from strong currents may also potentially cause non-quantum "pairing" among cavity-/hole-trapped electrons constituting a heavy electron component that populates electron holes. The number densities are, however, expected to be very small and thus not viable for justification of macro-particles. All these processes are found to potentially generate cold compound populations. If such electron compounds are produced by the attractive forces, the forces provide a mechanism of cooling a small group of resonant electrons, loosely spoken, corresponding to classical condensation.

Excitation and Decay of Electron Acoustic Waves

2006 ◽  
Author(s):  
Francesco Valentini ◽  
Thomas M. O’Neil ◽  
Daniel H. E. Dubin
Keyword(s):  
Acoustic Waves ◽  
Electron Acoustic Waves ◽  
Electron Acoustic
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