Modulation instability of low-frequency electrostatic ion waves in magnetized electron-positron-ion plasma

2008 ◽  
Vol 15 (9) ◽  
pp. 092301 ◽  
Author(s):  
Nusrat Jehan ◽  
M. Salahuddin ◽  
H. Saleem ◽  
Arshad M. Mirza
Keyword(s):  
Modulation Instability ◽  
Low Frequency ◽  
Ion Plasma ◽  
Electron Positron ◽  
Ion Waves

Role of entropy in η i -mode driven nonlinear structures obtained by homotopy perturbation method in electron–positron–ion plasma

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Aziz Khan ◽  
U. Zakir ◽  
Qamar ul Haque ◽  
Anisa Qamar
Keyword(s):  
Perturbation Method ◽  
Low Frequency ◽  
Small Time ◽  
Tokamak Plasma ◽  
Ion Temperature ◽  
Ion Temperature Gradient ◽  
Ion Plasma ◽  
Electron Positron ◽  
Solitary And Shock Waves ◽  
Strongly Agree

Abstract We present an analysis of the effect of entropy on ion temperature gradient η i -mode driven solitary and shock waves in electron–positron–ion plasma having density and temperature inhomogeneities. Linear and nonlinear analysis having solutions in form of solitons and shocks shows that entropy influence changes the drift mode instability. Different limiting cases when (i) temperature fluctuations due to E × B only (η i ≫ 2/3), (ii) in the absence of entropy and (iii) neglecting positron effect (β = 1) are discussed. The homotophy perturbation method (HPM) is applied on the derived Korteweg–de-Vries (KdV) and KdV–Burger equations under small time approximation. It is found that both results, those obtained analytically and by the HPM technique, strongly agree with each other. These investigations may be useful to study low frequency electrostatic modes in magnetized electron–positron–ion plasma. For illustration, the model has been applied to the nonlinear electrostatic excitations in interstellar medium and tokamak plasma.

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.

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