The effect of dust grains on the Weibel instability in presence of large amplitude electrostatic waves

2020 ◽  
Vol 27 (4) ◽  
pp. 043702
Author(s):  
Ajay Gahlot ◽  
Suresh C. Sharma ◽  
Jyotsna Sharma
Keyword(s):  
Large Amplitude ◽  
Dust Grains ◽  
Electrostatic Waves ◽  
Weibel Instability

scholarly journals Large-amplitude electrostatic waves associated with magnetic ramp substructure at Earth's bow shock

2006 ◽  
Vol 33 (15) ◽  
Author(s):  
A. J. Hull ◽  
D. E. Larson ◽  
M. Wilber ◽  
J. D. Scudder ◽  
F. S. Mozer ◽  
...  
Keyword(s):  
Large Amplitude ◽  
Bow Shock ◽  
Electrostatic Waves ◽  
Earth’S Bow Shock

Effect of a large amplitude Langmuir wave on the Weibel instability

1997 ◽  
Vol 226 (3-4) ◽  
pp. 193-195 ◽  
Author(s):  
R. Annou ◽  
V.K. Tripathi
Keyword(s):  
Large Amplitude ◽  
Langmuir Wave ◽  
Weibel Instability

Arbitrary amplitude solitary waves in plasmas with dust grains of opposite polarity and non-thermal ions

2010 ◽  
Vol 76 (3-4) ◽  
pp. 441-451 ◽  
Author(s):  
S. K. MAHARAJ ◽  
R. BHARUTHRAM ◽  
S. V. SINGH ◽  
S. R. PILLAY ◽  
G. S. LAKHINA
Keyword(s):  
Solitary Wave ◽  
Parameter Space ◽  
Solitary Waves ◽  
Large Amplitude ◽  
Opposite Polarity ◽  
Dust Grains ◽  
Positive Potential ◽  
Mass Ratios ◽  
Arbitrary Amplitude ◽  
Dust Fluid

AbstractThe existence of large amplitude solitary waves in a plasma comprised of a cold negative dust fluid, adiabatic positive dust fluid, Boltzmann electrons and non-thermal ions is theoretically investigated. Different regions in parameter space that correspond to different values of the ratio of the charge-to-mass ratios of the positive and negative dust grains have been identified where either negative or positive potential solitary wave structures occur and a region where coexistence of negative and positive potential solitary waves is supported.

scholarly journals Variations in the abundance of small particles

1991 ◽  
Vol 147 ◽  
pp. 151-160
Author(s):  
F. Boulanger
Keyword(s):  
Gas Phase ◽  
Large Amplitude ◽  
Molecular Clouds ◽  
Velocity Structure ◽  
Size Range ◽  
Interstellar Matter ◽  
Dust Grains ◽  
Small Particles ◽  
Order Of Magnitude ◽  
Ir Emission

IRAS images of nearby molecular clouds show that the mid-IR emission from small particles in the size range 102 to 105 atoms is distributed very differently from the 100 μm emission from large dust grains. Variations in color ratios by as much as one order of magnitude are seen on all angular scales. We summarize observational properties of the color variations and argue that neither their large amplitude nor their morphology can be explained by changes of the excitation by the UV radiation field only. The color variations reflect considerable inhomogeneities in the abundance of small particles. We suggest that the abundance variations are related to the cycling of interstellar matter between the gas phase and dust grains. This interpretation entails that clouds with distinct IR colors differ in their density and velocity structure and that cycling of matter between gas phase and dust grains is more ubiquitous and rapid that generally thought.

scholarly journals Fully nonlinear electrostatic waves in electron–positron plasmas

2009 ◽  
Vol 76 (3-4) ◽  
pp. 267-275 ◽  
Author(s):  
GAIMIN LU ◽  
YUE LIU ◽  
YOUMEI WANG ◽  
L. STENFLO ◽  
S. I. POPEL ◽  
...  
Keyword(s):  
Large Amplitude ◽  
Small Amplitude ◽  
Governing Equations ◽  
Fully Nonlinear ◽  
Electrostatic Waves ◽  
Phase Velocities ◽  
Electron Positron ◽  
Large Phase

AbstractFully nonlinear electrostatic waves in a plasma containing electrons, positrons, and ions are investigated by solving the governing equations exactly. It is found that both smooth and spiky quasistationary waves exist, and large-amplitude waves necessarily have large-phase velocities, but small-amplitude waves can be both fast and slow.

Large amplitude ion-acoustic double layers in warm dusty plasma

2014 ◽  
Vol 81 (1) ◽  
Author(s):  
S. L. Jain ◽  
R. S. Tiwari ◽  
M. K. Mishra
Keyword(s):  
Numerical Analysis ◽  
Mach Number ◽  
Large Amplitude ◽  
Double Layers ◽  
Nonlinear Structures ◽  
Dust Grains ◽  
Laboratory Plasma ◽  
Mobility Of Ions ◽  
Ion Acoustic ◽  
Charge Concentration

Large amplitude ion-acoustic double layer (IADL) is studied using Sagdeev's pseudo-potential technique in collisionless unmagnetized plasma comprising hot and cold Maxwellian population of electrons, warm adiabatic ions, and dust grains. Variation of both Mach number (M) and amplitude |φm| of large amplitude IADL with charge, concentration, and mass of heavily charged massive dust grains is investigated for both positive and negative dust in plasma. Our numerical analysis shows that system supports only rarefactive large amplitude IADL for the selected set of plasma parameters. Our investigations for both negative and positive dust grains reveal that ion temperature increases the mobility of ions, resulting in increase in the Mach number of IADL. The larger mobility of ions causes leakage of ions from localized region, resulting into decrease in the amplitude of IADL. Other parameters, e.g. temperature ratio of hot to cold electrons, charge, concentration, mass of heavily charged massive dust grains also play significant role in the properties and existence of double layers. Since it is well established that both positive and negative dust are found in space as well as laboratory plasma, and double layers have a tremendous role to play in astrophysics, we have included both positive and negative dust in our numerical analysis for the study of large amplitude IADL. Further data used for negative dust are close to experimentally observed data. Hence, it is anticipated that our parametric studies for heavily charged (both positive and negative) dust may be useful in understanding laboratory plasma experiments, identifying nonlinear structures in upper part of ionosphere and lower part of magnetosphere structures, and in theoretical research for the study of properties of nonlinear structures.

Some Properties of large-amplitude electrostatic waves (Allis modes)

1973 ◽  
Vol 9 (1) ◽  
pp. 117-130 ◽  
Author(s):  
W. W. Neel ◽  
R. W. Flynn
Keyword(s):  
Large Amplitude ◽  
Electron Distribution ◽  
Maximum Amplitude ◽  
Approximate Expression ◽  
Plasma Waves ◽  
Electrostatic Waves ◽  
Solitary Pulse ◽  
Limiting Case ◽  
Trapped Electron ◽  
Electrostatic Plasma Waves

Allis modes are large-ampliturde, undamped electrostatic plasma waves, in which the trapped electron distribution is the analytic continuation of the untrapped distribution. Allis modes can be pulse-like, as well as periodic. As the amplitude of the periodic solutions increases, the frequency decrsases and the wavelength increases, leading finally to solitary pulse solutions as a limiting case, reached when an appreciable number of electrons are trapped by the wave. These pluse-like solutions imply a maximum amplitude to Allis modes, and a maximum d.c. current they can drive. A simple approximate expression gives the non-linear properties of Allis modes in terms of the linear properties and the maximum amplitude.

scholarly journals Variations in the abundance of small particles

1991 ◽  
Vol 147 ◽  
pp. 151-160
Author(s):  
F. Boulanger
Keyword(s):  
Gas Phase ◽  
Large Amplitude ◽  
Molecular Clouds ◽  
Velocity Structure ◽  
Size Range ◽  
Interstellar Matter ◽  
Dust Grains ◽  
Small Particles ◽  
Order Of Magnitude ◽  
Ir Emission

IRAS images of nearby molecular clouds show that the mid-IR emission from small particles in the size range 102 to 105 atoms is distributed very differently from the 100 μm emission from large dust grains. Variations in color ratios by as much as one order of magnitude are seen on all angular scales. We summarize observational properties of the color variations and argue that neither their large amplitude nor their morphology can be explained by changes of the excitation by the UV radiation field only. The color variations reflect considerable inhomogeneities in the abundance of small particles. We suggest that the abundance variations are related to the cycling of interstellar matter between the gas phase and dust grains. This interpretation entails that clouds with distinct IR colors differ in their density and velocity structure and that cycling of matter between gas phase and dust grains is more ubiquitous and rapid that generally thought.

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