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|Title:||Formation of solitary waves and oscillatory shocklets in a two-temperature electron kappa-distributed plasma|
Sakanaka, P. H.
Mirza, A. M.
|Abstract:||Large-amplitude electron acoustic (EA) waves and shocklets are investigated in a two-temperature electron plasma. For this purpose, dynamical cold electrons are described by the fully nonlinear continuity and momentum equations, while superthermal (hot) inertialess electrons are described by the kappa-distribution function with a neutralizing background of static positive ions. The fluid equations along with a quasineutrality equation are solved to obtain a set of two characteristic wave equations that admit analytical and numerical solutions. It is shown that variation due to hot electron superthermality and hot-to-cold electron density ratio strongly affects the profiles of nonlinear EA structures in terms of negative potential, cold electron velocity and density. In particular, at time tau = 0; symmetric solitary pulses are formed, which develop into oscillatory shocklets with the course of time. Our results should be useful for understanding solitary excitations and associated nonstationary large-amplitude shocklets in laboratory kappa-distributed plasmas, where superthermal (hot) energetic electrons exist.|
|Subject:||Plasma (Gases ionizados)|
|Appears in Collections:||IFGW - Artigos e Outros Documentos|
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