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Non-Linear ion-Acoustic Solitary Waves in electron-positron-ion Plasma with Non-Thermal electrons

Journal of Modern Physics 2017年第6期8卷 892-902页

作者： S. K. Anguma I. Habumugisha L. Nazziwa E. Jurua N. Noreen Department of Physics Muni University Arua Uganda Department of Physics Kabale University Kabale Uganda Department of Physics Islamic University in Uganda Mbale Uganda Department of Physics Bishop Stuat University Kakoba Uganda Department of Physics Mbarara University of Science and Technology Mbarara Uganda Department of Physics Forman Christian College (Chartered University) Lahore Pakistan

ion-acoustic solitary (IAS) waves in electron-positron-ion (e-p-i) plasma have been of interest to many researchers probably due to their relevance in understanding the Universe. However, the study of non-linear ion-acoustic waves in e-p-i plasma with non-thermal electrons has not been adequately studied. A theoretical investigation on non-linear IAS waves in e-p-i plasma comprising of warm inertial adiabatic fluid ions and electrons that are kappa distributed, and Boltzman distributed positron is presented here using the Sagdeev potential technique. It was found that existence domains of finite amplitude IAS waves were confined within the limits of minimum and maximum Mach numbers with varying k values. For lower values of k, the amplitude of the solitary electrostatic potential structures increased as the width decreased, while for high values, the potential amplitude decreased as the width of the solitary structure increased.

关键词： Non-Thermal electrons ion-Acoustic Solitary Waves electron-positron-ion Plasmas

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Solitary kinetic Alfven waves in dense plasmas with relativistic degenerate electrons and positrons

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Plasma Science and Technology 2019年第4期21卷 85-93页

作者： Monzurul K AHMED Om P SAH Department of Physics Biijhora MahavidyalayaBongaigaon-783380AssamIndia

Propagation of solitary kinetic Alfven waves(KAWs)is investigated in small but finite/3(particle-to-magnetic pressure ratio)collisionless dense plasma whose constituents are non degenerate wann ions,and relativistic degenerate electrons and *** the use of reductive perturbation technique,Kortweg-de Vries equation is derived to obtain small amplitude localized wave solution of *** effects of plasma 0,positron concentration,electron relativistic degeneracy parameter,ion thermal temperature and obliqueness parameter on solitary KAWs are *** results of this theoretical investigation are aimed at elucidating characteristics of kinetic Alfven solitary waves in relativistic degenerate e-p-i plasmas found in dense astrophysical objects specifically neutron stars and white dwarfs.

关键词： solitary kinetic Alfven waves dense plasmas electron-positron-ion plasma,relativistic degenerate plasma reductive perturbation technique

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ion-Acoustic Shock Waves in Nonextensive Multi-ion Plasmas

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Communications in Theoretical Physics 2015年第10期64卷 479-484页

作者： N.Jannat M.Ferdousi A.A.Mamun Department of Physics Jahangirnagar University

The nonlinear propagation of ion-acoustic(IA) shock waves(SHWs) in a nonextensive multi-ion plasma system(consisting of inertial positive light ions as well as negative heavy ions, noninertial nonextensive electrons and positrons) has been studied. The reductive perturbation technique has been employed to derive the Burgers *** basic properties(polarity, amplitude, width, etc.) of the IA SHWs are found to be significantly modified by the effects of nonextensivity of electrons and positrons, ion kinematic viscosity, temperature ratio of electrons and positrons, *** has been observed that SHWs with positive and negative potential are formed depending on the plasma *** findings of our results obtained from this theoretical investigation may be useful in understanding the characteristics of IA SHWs both in laboratory and space plasmas.

关键词： ion-acoustic shock waves electron-positron-ion pla

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