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Oblique propagation of arbitrary amplitude electron acoustic solitary waves in magnetized kappa-distributed plasmas

S Sultana, I Kourakis, M A Hellberg2012年Plasma Physics and Controlled FusionIF 2.2出版社

The linear and nonlinear properties of large-amplitude electron-acoustic waves are investigated in a magnetized plasma comprising two distinct electron populations (hot and cold) and immobile ions. The hot electrons are assumed to be in a non-Maxwellian state, characterized by an excess of superthermal particles, here modeled by a kappa-type long-tailed distribution function. Waves are assumed to propagate obliquely to the ambient magnetic field. Two types of electrostatic modes are shown to exist in the linear regime, and their properties are briefly analyzed. A nonlinear pseudopotential-type analysis reveals the existence of large-amplitude electrostatic solitary waves and allows for an investigation of their propagation characteristics and existence domain, in terms of the soliton speed (Mach number). The effects of the key plasma configuration parameters, namely the superthermality index and the cold electron density, on the soliton characteristics and existence domain, are studied. The role of obliqueness and magnetic field is discussed.

日本語訳

磁化されたプラズマ中の大振幅電子音響波の線形および非線形特性を、2つの異なる電子集団(高温および低温)と不動イオンからなるプラズマにおいて調査する。高温電子は非マクスウェル状態にあると仮定され、ここではカッパ型の長い裾を持つ分布関数によって特徴づけられる過剰な超熱粒子の存在を特徴とする。波動は背景磁場に対して斜めに伝播すると仮定される。線形領域において2種類の静電モードが存在することが示され、その特性が簡潔に解析される。非線形擬ポテンシャル解析により、大振幅の静電孤立波の存在が明らかにされ、ソリトン速度(マッハ数)の観点からその伝播特性と存在領域の調査が可能となる。主要なプラズマ構成パラメータ、すなわち超熱性指数と低温電子密度が、ソリトンの特性および存在領域に及ぼす影響が研究される。斜め伝播の効果と磁場の役割について考察する。

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Solitary waveAcoustic solitary waveElectron acoustic waves
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