Interaction of electron acoustic waves in the presence of superthermal electrons in terrestrial magnetosphere

2020 ◽  
Vol 27 (4) ◽  
pp. 042105 ◽  
Author(s):  
R. Jahangir ◽  
W. Masood
Keyword(s):  
Acoustic Waves ◽  
Superthermal Electrons ◽  
Electron Acoustic Waves ◽  
Terrestrial Magnetosphere ◽  
Electron Acoustic

Modulational instability of electron-acoustic waves in plasmas with superthermal electrons

2012 ◽  
Vol 90 (7) ◽  
pp. 661-666 ◽  
Author(s):  
Parvin Eslami ◽  
Marzieh Mottaghizadeh ◽  
Hamid Reza Pakzad
Keyword(s):  
Acoustic Waves ◽  
Modulational Instability ◽  
Perturbation Technique ◽  
Density Ratio ◽  
Wave Number ◽  
Superthermal Electrons ◽  
Electron Acoustic Waves ◽  
Instability Growth ◽  
Cold Electrons ◽  
Electron Acoustic

The propagation of electron-acoustic waves (EAWs) in plasmas composed of inertial cold electrons, hot superthermal electrons, and stationary ions is investigated. By means of the reduction perturbation technique, a nonlinear Schrödinger equation is derived and the modulation instability of EAW is analyzed, where the superthermal parameter is found to be of significant importance. It is shown that the presence of superthermal electrons enhances the critical wave number of the modulational instability of EAWs. Besides, due to the presence of the superthermal electrons, EAWs are stable on a vaster region. Moreover, the modulational instability growth rate is lower for a larger population of superthermal electrons. Further, it is shown that increasing values of the relative density ratio α = ne0/nc0 shifts the instability domain to lower values of wave number k.

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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