Electron-acoustic waves in the laboratory: an experiment revisited

2000 ◽  
Vol 64 (4) ◽  
pp. 433-443 ◽  
Author(s):  
M. A. HELLBERG ◽  
R. L. MACE ◽  
R. J. ARMSTRONG ◽  
G. KARLSTAD
Keyword(s):  
Distribution Function ◽  
Acoustic Wave ◽  
Acoustic Waves ◽  
High Frequency ◽  
Hot Electron ◽  
Electron Component ◽  
Temperature Plasma ◽  
Electrostatic Waves ◽  
Electron Acoustic Wave ◽  
Electron Acoustic

High-frequency electrostatic waves have been observed in a two-electron-temperature plasma. Both bi-Maxwellian and Maxwellian-waterbag models were found to be inadequate in explaining the observed dispersion and damping rates. However, modelling of the hot electron component with a κ-distribution function confirms that the experiments represent observation of the electron-acoustic wave in the laboratory.

Higher-order electron modes in a two-electron-temperature plasma

1990 ◽  
Vol 43 (2) ◽  
pp. 239-255 ◽  
Author(s):  
R. L. Mace ◽  
M. A. Hellberg
Keyword(s):  
Electron Temperature ◽  
Higher Order ◽  
Hot Electron ◽  
Temperature Plasma ◽  
Critical Curves ◽  
Higher Order Modes ◽  
Electron Acoustic Wave ◽  
Electron Acoustic ◽  
Relationship Of ◽  
The Relationship

We discuss critical curves that allow us to predict, qualitatively, the topological behaviour of higher-order modes in a two-electron-temperature plasma as wavenumber and hot electron fraction are varied. The relationship of these higher-order modes to the electron-acoustic wave is elucidated.

Linear and nonlinear modified electron-acoustic waves

1983 ◽  
Vol 29 (3) ◽  
pp. 409-413 ◽  
Author(s):  
M. Y. Yu ◽  
P. K. Shukla
Keyword(s):  
Acoustic Wave ◽  
Acoustic Waves ◽  
Electron Number Density ◽  
Cold Electron ◽  
Number Density ◽  
Electron Number ◽  
Electron Acoustic Waves ◽  
Electron Acoustic Wave ◽  
Linear And Nonlinear ◽  
Electron Acoustic

It is shown that a modified electron-acoustic wave exists in a plasma with distinct hot and cold electron components. The frequency of this wave depends strongly on the cold electron number density. Solitons associated with the modified electron-acoustic waves are also discussed.

The Electron Acoustic Wave and Its Role in Solar Flaring Loops Heating

2020 ◽  
Vol 904 (2) ◽  
pp. 193
Author(s):  
L. Chen ◽  
D. J. Wu ◽  
L. Xiang ◽  
C. Shi ◽  
B. Ma ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Electron Acoustic Wave ◽  
Electron Acoustic

Nonlinear interaction of electron acoustic waves with Langmuir waves in presence of magnetic field in plasmas

2014 ◽  
Vol 81 (1) ◽  
Author(s):  
Manjistha Dutta ◽  
Manoranjan Khan ◽  
Nikhil Chakrabarti
Keyword(s):  
Magnetic Field ◽  
Nonlinear Interaction ◽  
Acoustic Waves ◽  
Low Frequency ◽  
Acoustic Mode ◽  
Magnetized Plasma ◽  
Langmuir Waves ◽  
Coupled Equations ◽  
Electron Acoustic Wave ◽  
Electron Acoustic

Nonlinear interaction between Langmuir waves and Electron Acoustic Wave (EAW) is being studied in a warm magnetized plasma in presence of two intermingled fluids, hot electrons, and cold electrons while ions forming static background. Two-fluid, two-timescale theory is performed to derive modified Zakharov's equations in a magnetized plasma. These coupled equations describe low-frequency response of electron density due to high-frequency electric field along with magnetic field perturbations. Linear analysis shows coupling between acoustic mode, upper hybrid mode, and cyclotron modes. These modes are found to be modified due to the presence of two electron components. These equations are significant in the context of weak and strong turbulence.

Density and temperature effects on a surface electron-acoustic wave in a semi-bounded dusty plasma of two-temperature electrons

2007 ◽  
Vol 73 (4) ◽  
pp. 433-438 ◽  
Author(s):  
DAE-HAN KI ◽  
YOUNG-DAE JUNG
Keyword(s):  
Acoustic Wave ◽  
Phase Velocity ◽  
Dusty Plasma ◽  
Plasma Wave ◽  
Hot Electrons ◽  
Surface Electron ◽  
Electron Acoustic Wave ◽  
Cold Electrons ◽  
Electron Acoustic ◽  
Two Temperature

AbstractThe effects of density and temperature on a surface electron-acoustic plasma wave are investigated in a semi-bounded dusty plasma of two-temperature electrons. The dispersion relation of the surface electron-acoustic plasma wave is obtained by the plasma dielectric function with the specular reflection boundary condition. The phase velocity is found to be decreased when increasing the ratio of the temperature of hot electrons to that of cold electrons for large wave numbers. It is also found that the phase velocity increases with an increase in the ratio of the density of hot electrons to that of cold electrons and that the phase velocity of the surface electron-acoustic wave increases with an increase in the density of the dust grains.

Electron acoustic wave in a dusty plasma

2002 ◽  
Vol 50 (7-8) ◽  
pp. 807-810 ◽  
Author(s):  
J Vranješ ◽  
H Saleem ◽  
S Poedts
Keyword(s):  
Acoustic Wave ◽  
Dusty Plasma ◽  
Electron Acoustic Wave ◽  
Electron Acoustic

Coupled Langmuir and nonlinear ion acoustic waves in the presence of non-thermal electrons

2009 ◽  
Vol 75 (2) ◽  
pp. 193-202 ◽  
Author(s):  
H. ALINEJAD ◽  
P. A. ROBINSON ◽  
O. SKJAERAASEN ◽  
I. H. CAIRNS
Keyword(s):  
Mach Number ◽  
Acoustic Waves ◽  
High Frequency ◽  
Strong Field ◽  
Low Frequency ◽  
Thermal Electron ◽  
Electrostatic Waves ◽  
Envelope Solitons ◽  
Langmuir Soliton ◽  
Langmuir Solitons

AbstractA new set of equations describing the coupling of high-frequency electrostatic waves with ion fluctuations is obtained taking into account a non-thermal electron distribution. It is shown that there exist stationary envelope solitons which have qualitatively different structures from the solutions reported earlier. In particular, the Langmuir field envelopes are found with similar width and strong field intensities in comparison to the isothermal case. It is also shown that the presence of the fast or non-thermal electrons significantly modifies the nature of Langmuir solitons in the transition from a single-hump solution to a double-hump solution as the Mach number increases to unity. The low-frequency electrostatic potential associated with the high-frequency Langmuir field has the usual single-dip symmetric structure whose amplitude increases with increasing Mach number. Furthermore, the dip at the center of the double-hump Langmuir soliton is found to become smaller as the proportion of non-thermal electrons increases.

High-frequency ion electrostatic instabilities in mixed warm–cold plasma

1976 ◽  
Vol 15 (3) ◽  
pp. 325-333 ◽  
Author(s):  
L. Gomberoff ◽  
S. Cuperman
Keyword(s):  
Distribution Function ◽  
High Frequency ◽  
Cold Plasma ◽  
Loss Cone ◽  
Electrostatic Waves ◽  
High Frequencies ◽  
Proton Gyrofrequency

It is shown that an ion loss cone distribution function with m ≥ 1 becomes unstable against electrostatic waves with ω ≫ Ωp and k0 = 0 in the presence of a cold plasma population, in contrast with pure warm systems, which require m ≥ 3 for instability. This result is an extension to high frequencies, ω ≫ Ω of similar conclusions reached by Pearlstein et al. (1966) and Farr & Budwine (1968), for ω-values equal to the first few harmonics of the proton gyrofrequency.

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