Roles of adiabaticity and dynamics of electrons and ions on dust-ion-acoustic K-dV solitonsA. A. Mamun and N. Jahan
Department of Physics, Jahangirnagar University - Savar, Dhaka-1342, Bangladesh
received 30 July 2008; accepted in final form 18 September 2008; published November 2008
published online 16 October 2008
A dusty plasma containing adiabatic inertial electrons and ions, and negatively charged static dust is considered in order to investigate the roles of dynamics and adiabaticity of electrons and ions on dust-ion-acoustic (DIA) Korteweg-de Vries (K-dV) solitons. The standard reductive perturbation method is employed for this theoretical investigation of DIA K-dV solitons in such a realistic adiabatic dusty plasma. It is found that i) the role of electron dynamics in modifying the basic features of the DIA K-dV solitons is insignificant; ii) the combined effects of adiabatic electrons and negatively charged static dust significantly modify the basic properties (speed, amplitude, and width) of the K-dV DIA solitons; and iii) due to the effect of the adiabaticity of electrons, one cannot have negative DIA K-dV solitons, which can exist in an isothermal dusty plasma (containing isothermal electrons, cold ions, and negatively charged static dust) for =zdnd0/ni0 > 2/3, where zd is the number of electrons residing onto a dust grain surface, nd0 is the constant (static) dust number density and ni0 is the equilibrium ion number density. The implications of our realistic dusty plasma model and of our results in space and laboratory dusty plasma are discussed.
52.27.-h - Basic studies of specific kinds of plasmas.
52.27.Lw - Dusty or complex plasma; plasma crystals.
52.35.Sb - Solitons; BGK modes.
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