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Three-dimensional ion-acoustic wave packet in magnetoplasmas with superthermal electrons

R Sabry, W M Moslem, P K Shukla2012年Plasma Physics and Controlled FusionIF 2.2出版社

Three-dimensional modulated electrostatic ion-acoustic wave packet in magnetized plasma with electrons obeying kappa distribution is investigated. The standard reductive perturbation theory is used to derive the corresponding three-dimensional nonlinear Schrödinger (3D-NLS) equation which governs the dynamics, as well as the slow modulation of the ion-acoustic wave packets. Both the dispersive and the nonlinear coefficients of the 3D-NLS equation are modified by the inclusion of the transverse velocity perturbations, as well as the external magnetic field. New instability regimes arise when the ion to electron temperature ratio σi, the spectral index κ (i.e. measuring deviation from Maxwellian equilibrium), and the ion gyrofrequency ωci are presented. Importantly, the latter establishes new instability regimes that are not presented in an unmagnetized plasma.

日本語訳

磁化プラズマ中のカッパ分布に従う電子を伴う三次元変調イオン音波波動パケットを調査する。標準的な簡約摂動法を用いて、イオン音波波動パケットの力学とゆっくりとした変調を支配する対応する三次元非線形シュレーディンガー(3D-NLS)方程式を導出する。3D-NLS方程式の分散係数と非線形係数の両方は、横方向の速度摂動と外部磁場の導入によって修正される。イオン対電子温度比σᵢ、スペクトル指数κ(すなわち、マクスウェル平衡からの偏差を測定する)、およびイオンジャイロ周波数ω꜀ᵢが提示されると、新しい不安定性領域が生じる。重要なことに、後者は非磁化プラズマでは提示されない新しい不安定性領域を確立する。

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Magnetized plasmaIon acoustic waveSuperthermal electrons
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