Improved Speed and Shape of Ion-Acoustic Waves in a Warm Plasma  

作　　者：H.G.Abdelwahed E.K.El-Shewy 

机构地区：[1]Physics Department, College of Sciences and Humanitarian Studies, Salman Bin Abdulaziz University [2]Theoretical Physics Group, Faculty of Science, Mansoura University

出　　处：《Communications in Theoretical Physics》2013年第10期445-452,共8页理论物理通讯（英文版）

基　　金：Supported by the Deanship of Scientific Research in Salman Bin Abdul-Aziz University,Saudi Arabia under Grant No.104/T/33

摘　　要：The basic set of fluid equations can be reduced to the nonlinear Kortewege-de Vries(KdV)and nonlinear Schro¨dinger(NLS)equations.The rational solutions for the two equations has been obtained.The exact amplitude of the nonlinear ion-acoustic solitary wave can be obtained directly without resorting to any successive approximation techniques by a direct analysis of the given field equations.The Sagdeev’s potential is obtained in terms of ion acoustic velocity by simply solving an algebraic equation.The soliton and double layer solutions are obtained as a small amplitude approximation.A comparison between the exact soliton solution and that obtained from the reductive perturbation theory are also discussed.

关 键 词：field equations Sagdeev potential SOLITONS nonlinear waves shock waves nonlinear SchrSdinger（NLS） equation 

分 类 号：O53[理学—等离子体物理] TG174.442[理学—物理]