Nonlinear low-frequency structures in an electron–positron–ion plasma

2012 ◽  
Vol 78 (5) ◽  
pp. 545-551 ◽  
Author(s):  
S. MOOLLA ◽  
I. J. LAZARUS ◽  
R. BHARUTHRAM
Keyword(s):  
Electric Field ◽  
Acoustic Waves ◽  
Rest Frame ◽  
Low Frequency ◽  
Satellite Observations ◽  
Parallel Electric Field ◽  
Ion Acoustic Waves ◽  
Ion Plasma ◽  
Electron Positron ◽  
Electrons And Positrons

AbstractNonlinear ion cyclotron and ion-acoustic waves have been studied in an electron–positron–ion plasma. Using Boltzmann distributions for the electrons and positrons and fluid equations for the ions, a set of nonlinear equations in the rest frame of the propagating wave is derived and numerically solved for the electric field. A scan of parameter space reveals a range of solutions for the parallel electric field, from sinusoidal to sawtooth to highly spiky waveforms. The results are compared with satellite observations.

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

1997 ◽  
Vol 50 (2) ◽  
pp. 309 ◽  
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.

scholarly journals Ion acoustic quasi-soliton in an electron-positron-ion plasma with superthermal electrons and positrons

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 563-567 ◽  
Author(s):  
Jianyong Wang ◽  
Ying Zeng ◽  
Zufeng Liang ◽  
Yani Xu ◽  
Yuanxiang Zhang
Keyword(s):  
Acoustic Waves ◽  
Vries Equation ◽  
Reductive Perturbation Method ◽  
Superthermal Electrons ◽  
Ion Plasma ◽  
Electron Positron ◽  
Electrons And Positrons ◽  
Ion Acoustic ◽  
De Vries ◽  
Superthermal Electrons And Positrons

Abstract In this work, we are concerned with the ion acoustic quasi-soliton in an electron-positron-ion plasma with superthermal electrons and positrons. By using the reductive perturbation method, the Korteweg-de Vries equation is derived from the governing equations of ion acoustic waves. An interesting soliton-cnoidal wave solution of the Korteweg-de Vries equation and its quasi-soliton behaviour are presented. The influence of electron superthermality, positron superthermality and positron concentration ratio on characteristics of the quasi-soliton is confirmed to be significant.

Oblique modulation of ion-acoustic waves and envelope solitons in electron-positron-ion plasma

2009 ◽  
Vol 16 (6) ◽  
pp. 062305 ◽  
Author(s):  
Nusrat Jehan ◽  
M. Salahuddin ◽  
Arshad M. Mirza
Keyword(s):  
Acoustic Waves ◽  
Ion Acoustic Waves ◽  
Envelope Solitons ◽  
Ion Plasma ◽  
Electron Positron ◽  
Ion Acoustic

Nonlinear Ion-Acoustic Waves in Relativistic Electron-Positron-Ion Plasma: Liner and Higher Order Nonlinear Effects

2011 ◽  
Author(s):  
M. Mehdipoor ◽  
Muhammed Hasan Aslan ◽  
Ahmet Yayuz Oral ◽  
Mehmet Özer ◽  
Süleyman Hikmet Çaglar
Keyword(s):  
Relativistic Electron ◽  
Acoustic Waves ◽  
Nonlinear Effects ◽  
Higher Order ◽  
Ion Acoustic Waves ◽  
Plasma Liner ◽  
Ion Plasma ◽  
Electron Positron ◽  
Ion Acoustic

Effect of space-time fractional on the ion acoustic waves in electron-positron-ion plasma

2014 ◽  
Vol 350 (2) ◽  
pp. 591-598 ◽  
Author(s):  
S. A. El-Wakil ◽  
Essam M. Abulwafa ◽  
A. Elgarayhi ◽  
E. K. El-Shewy ◽  
Abeer A. Mahmoud ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Space Time ◽  
Ion Acoustic Waves ◽  
Ion Plasma ◽  
Electron Positron ◽  
Ion Acoustic

Nonlinear propagation of ion-acoustic waves in an electron-positron-ion plasma

2014 ◽  
Vol 352 (2) ◽  
pp. 579-584 ◽  
Author(s):  
M. Ferdousi ◽  
S. Yasmin ◽  
S. Ashraf ◽  
A. A. Mamun
Keyword(s):  
Acoustic Waves ◽  
Nonlinear Propagation ◽  
Ion Acoustic Waves ◽  
Ion Plasma ◽  
Electron Positron ◽  
Ion Acoustic

scholarly journals Cluster observations and theoretical identification of broadband waves in the auroral region

2005 ◽  
Vol 23 (12) ◽  
pp. 3739-3752 ◽  
Author(s):  
M. Backrud-Ivgren ◽  
G. Stenberg ◽  
M. André ◽  
M. Morooka ◽  
Y. Hobara ◽  
...  
Keyword(s):  
Electric Field ◽  
Acoustic Waves ◽  
Auroral Region ◽  
Parallel Electric Field ◽  
Ion Acoustic Waves ◽  
Ion Cyclotron Waves ◽  
Linear Waves ◽  
Field Lines ◽  
Broadband Waves ◽  
The Waves

Abstract. Broadband waves are common on auroral field lines. We use two different methods to study the polarization of the waves at 10 to 180 Hz observed by the Cluster spacecraft at altitudes of about 4 Earth radii in the nightside auroral region. Observations of electric and magnetic wave fields, together with electron and ion data, are used as input to the methods. We find that much of the wave emissions are consistent with linear waves in homogeneous plasma. Observed waves with a large electric field perpendicular to the geomagnetic field are more common (electrostatic ion cyclotron waves), while ion acoustic waves with a large parallel electric field appear in smaller regions without suprathermal (tens of eV) plasma. The regions void of suprathermal plasma are interpreted as parallel potential drops of a few hundred volts.

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