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

Published online by Cambridge University Press:  21 February 2013

S. K. EL-LABANY ,
R. SABRY ,
E. F. EL-SHAMY  and
D. M. KHEDR
S. K. EL-LABANY
Affiliation:
Theoretical Physics Group, Department of Physics, Faculty of Science, Damietta University, Damietta 34517, Egypt ([email protected])
R. SABRY
Affiliation:
Theoretical Physics Group, Department of Physics, Faculty of Science, Damietta University, Damietta 34517, Egypt ([email protected]) International Centre for Advanced Studies in Physical Sciences, Faculty of Physics and Astronomy, Ruhr University Bochum, D-44780 Bochum, Germany Department of Physics, College of Science and Humanitarian Studies, Salman bin Abdulaziz University, Al Kharj, Kingdom of Saudi Arabia
E. F. EL-SHAMY
Affiliation:
Theoretical Physics Group, Department of Physics, Faculty of Science, Damietta University, Damietta 34517, Egypt ([email protected]) Department of Physics, College of Science, King Khalid University, P.O. 9004, Abha, Kingdom of Saudi Arabia
D. M. KHEDR
Affiliation:
Theoretical Physics Group, Department of Physics, Faculty of Science, Damietta University, Damietta 34517, Egypt ([email protected])
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Abstract

Investigation 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.

Type
Papers
Information
Journal of Plasma Physics , Volume 79 , Issue 5 , October 2013 , pp. 613 - 621
Copyright
Copyright © Cambridge University Press 2013 

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