Evolution of ion–ion acoustic instability in multi-ion plasma sheaths

The effect of ion temperature on ion-acoustic solitary waves in the case of a two-ion plasma has been investigated using the pseudopotential approach of Sagdeev. An analytical solution for relatively small amplitudes has also been obtained. Our result has been compared, whenever possible, with the experimental result obtained by Nakamura. It is found that a finite ion temperature considerably modifies the restrictions on the Mach number obtained for cold ions.

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A linear and quasi-linear investigation of the crossfield current-driven ion-acoustic instability

Journal of Plasma Physics ◽

10.1017/s0022377800000258 ◽

1982 ◽

Vol 28 (2) ◽

pp. 267-279 ◽

Cited By ~ 2

Author(s):

R. Bharuthram ◽

M. A. Hellberg

Keyword(s):

Linear Growth ◽

Velocity Distribution Function ◽

Linear Growth Rate ◽

Particle Diffusion ◽

Anomalous Resistivity ◽

Heating Rates ◽

Ion Heating ◽

Acoustic Instability ◽

Ion Acoustic ◽

Drift Instability

The linear growth rate of the crossfield current-driven ion-acoustic instability is obtained for any equilibrium particle velocity distribution function of the type . Quasi-linear theory is then used to investigate the saturation of the instability. Several associated features, namely, particle diffusion in velocity space, anomalous resistivity, energy distribution and electron and ion heating rates are evaluated for a Maxwellian distribution. Finally, a brief comparison is made with the heating rates associated with the electron cyclotron drift instability.

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Brief Communication: The double layer in the separatrix region during magnetic reconnection

Nonlinear Processes in Geophysics ◽

10.5194/npg-22-167-2015 ◽

2015 ◽

Vol 22 (2) ◽

pp. 167-171

Author(s):

J. Guo ◽

B. Yu

Keyword(s):

Electron Beam ◽

Magnetic Reconnection ◽

Double Layer ◽

Particle In Cell ◽

Acoustic Instability ◽

Ion Acoustic ◽

Evolution Stage ◽

Spatial Size ◽

Electron Holes ◽

Observation Results

Abstract. With two-dimensional (2-D) particle-in-cell (PIC) simulations we investigate the evolution of the double layer (DL) driven by magnetic reconnection. Our results show that an electron beam can be generated in the separatrix region as magnetic reconnection proceeds. This electron beam could trigger the ion-acoustic instability; as a result, a DL accompanied with electron holes (EHs) can be found during the nonlinear evolution stage of this instability. The spatial size of the DL is about 10 Debye lengths. This DL propagates along the magnetic field at a velocity of about the ion-acoustic speed, which is consistent with the observation results.

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Effects of Positron Density and Temperature on Large Amplitude Ion-acoustic Waves in an Electron - Positron - Ion Plasma

Australian Journal of Physics ◽

10.1071/p96064 ◽

1997 ◽

Vol 50 (2) ◽

pp. 309 ◽

Cited By ~ 50

Author(s):

Y. N. Nejoh

Keyword(s):

Acoustic Waves ◽

Large Amplitude ◽

Density Ratio ◽

Present Theory ◽

Electron Mass ◽

Mass Ratio ◽

Ion Acoustic Waves ◽

Ion Plasma ◽

Electron Positron ◽

Ion Acoustic

The nonlinear wave structures of large amplitude ion-acoustic waves are studied in a plasma with positrons. We have presented the region of existence of the ion-acoustic waves by analysing the structure of the pseudopotential. The region of existence sensitively depends on the positron to electron density ratio, the ion to electron mass ratio and the positron to electron temperature ratio. It is shown that the maximum Mach number increases as the positron temperature increases and the region of existence of the ion-acoustic waves spreads as the positron temperature increases. The present theory is applicable to analyse large amplitude ion-acoustic waves associated with positrons which may occur in space plasmas.

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