scholarly journals Large amplitude ion-acoustic solitons in warm negative ion plasmas with superthermal electrons

AIP Advances ◽  
2017 ◽  
Vol 7 (11) ◽  
pp. 115114 ◽  
Author(s):  
Kishan Kumar ◽  
M. K. Mishra
Keyword(s):  
Large Amplitude ◽  
Negative Ion ◽  
Superthermal Electrons ◽  
Ion Acoustic ◽  
Negative Ion Plasmas ◽  
Ion Acoustic Solitons

Face-to-Face Collisions of Bright and Dark Ion Acoustic Solitons in Superthermal Electrons for Different Geometrical Configurations

2018 ◽  
Vol 73 (10) ◽  
pp. 893-904 ◽  
Author(s):  
E.F. El-Shamy ◽  
N.A. El-Bedwehy ◽  
M. Shokry ◽  
S.K. El-Labany
Keyword(s):  
Phase Shift ◽  
Negative Ion ◽  
Superthermal Electrons ◽  
Face To Face ◽  
Laboratory Plasmas ◽  
Ion Acoustic ◽  
De Vries ◽  
The Face ◽  
Ion Acoustic Solitons ◽  
Non Linear Propagation

AbstractThe face-to-face collision of ion acoustic solitons (IASs) in superthermal plasmas composed of positive and negative ion fluids and superthermal electrons is investigated for different geometrical configurations. For the generic case, the extended Poincaré-Lighthill-Kuo (EPLK) analysis is employed to obtain the extended Korteweg-de Vries (EKdV) equations and phase shift equations. The non-linear propagation and the face-to-face collision of bright and dark IASs are studied. In addition, when the concentration of ion reaches the critical value, the EPLK method is applied to obtain the modified Korteweg-de Vries (mKdV) equations and the phase shift relations, which govern the excitation and the face-to-face collision of bright and dark IASs. Appropriately, the effects of several parameters such as the electron concentration, the superthermality of electrons and the diversity in the system’s geometry under consideration on the trajectories of IASs after the collision are discussed. Numerical calculations lead to some highlights on the properties of bright and dark IASs (e.g. in laboratory plasmas such as laser–matter/plasma interaction experiments and in astrophysical environments such as lower part of magnetosphere).

Nonlinear wave propagation of large amplitude ion-acoustic solitary waves in negative ion plasmas with superthermal electrons

2013 ◽  
Vol 79 (5) ◽  
pp. 613-621 ◽  
Author(s):  
S. K. EL-LABANY ◽  
R. SABRY ◽  
E. F. EL-SHAMY ◽  
D. M. KHEDR
Keyword(s):  
Solitary Waves ◽  
Large Amplitude ◽  
Negative Ions ◽  
High Energy ◽  
Negative Ion ◽  
Energetic Electrons ◽  
Ion Acoustic Solitary Waves ◽  
Ion Acoustic ◽  
Negative Ion Plasmas ◽  
Arbitrary Amplitude

AbstractInvestigation of arbitrary amplitude nonlinear ion-acoustic solitary waves which accompany collisionless positive–negative ion plasmas with high-energy electrons (represented by kappa distribution) is presented. Arbitrary amplitude solitary waves are investigated by deriving an energy-integral equation involving a Sagdeev-like pseudopotential. The existence regions of solitary pulses are, defined precisely, modified by the superthermality of energetic electrons. Furthermore, numerical calculations reveal that both compressive and rarefactive pulses may exist for negative ion mass groups in Titan's atmosphere. The superthermality of energetic electrons are found to modify the existence domains of large amplitude ion-acoustic waves in Titan's atmosphere. The dependence of solitary excitation characteristics on the superthermal parameter, the negative ion concentration, the positive-to-negative ions mass ratio, and the Mach number have been investigated. The present study might be helpful to understand the excitation of fully nonlinear ion-acoustic solitary pulses that may appear in the interplanetary medium and/or in the astrophysical plasmas in general.

Cut-off conditions and existence domains for large-amplitude ion-acoustic solitons and double layers in fluid plasmas

1990 ◽  
Vol 44 (1) ◽  
pp. 1-23 ◽  
Author(s):  
S. Baboolal ◽  
R. Bharuthram ◽  
M. A. Hellberg
Keyword(s):  
Negative Ion ◽  
Double Layers ◽  
Sagdeev Potential ◽  
Ion Acoustic ◽  
Negative Ion Plasmas ◽  
Ion Acoustic Solitons ◽  
Arbitrary Amplitude ◽  
Ion Species ◽  
Positive Ion

It is shown how existence domains for arbitrary-amplitude ion-acoustic solitons and double layers are determined numerically by cut-off conditions on the corresponding Sagdeev potential. A two-electron-temperature model is considered, and in positive-ion plasmas the cut-off conditions are given in terms of the electron parameters, while for negative-ion plasmas such conditions are described in terms of parameters characterizing the role of the negative ion species.

Sign in / Sign up

Export Citation Format

Share Document