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arXiv physics/0412047physics.plasm-phnlin.PSphysics.space-ph
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磁化等离子体中的哨声气体

Whistleron Gas in Magnetized Plasmas

Salvatore De Martino, Mariarosaria Falanga, Stephan I. Tzenov

摘要:

研究了磁化等离子体中哨声波的非线性动力学。由于这里考虑的等离子体和束-等离子体系统被假定为弱碰撞,在本文中进行的分析的参考点是系统的流体动力学和场方程。我们应用重整化群方法得到了振幅缓变哨声波的动力学方程。此外,它已被证明,本征模的振幅满足耦合的非线性薛定谔方程的无限系统。在这个意义上,哨声本征模形成了一种相互作用的准粒子气体,而缓慢变化的振幅可以被认为是预示着系统相关信息的动力学变量。我们描述的一个重要特点是,哨声波不扰动等离子体电子的初始均匀密度。等离子体对诱导哨声波的响应包括速度重新分布,它完全遵循哨声的行为。此外,非线性模式耦合的选择规则已被导出,这代表了我们的描述的另一个有趣的特点。

英文摘要:

We have studied the nonlinear dynamics of whistler waves in magnetized plasmas. Since plasmas and beam-plasma systems considered here are assumed to be weakly collisional, the point of reference for the analysis performed in the present paper is the system of hydrodynamic and field equations. We have applied the renormalization group method to obtain dynamical equations for the slowly varying amplitudes of whistler waves. Further, it has been shown that the amplitudes of eigenmodes satisfy an infinite system of coupled nonlinear Schrödinger equations. In this sense, the whistler eigenmodes form a sort of a gas of interacting quasiparticles, while the slowly varying amplitudes can be considered as dynamical variables heralding the relevant information about the system. An important feature of our description is that whistler waves do not perturb the initial uniform density of plasma electrons. The plasma response to the induced whistler waves consists in velocity redistribution which follows exactly the behaviour of the whistlers. In addition, selection rules governing the nonlinear mode coupling have been derived, which represent another interesting peculiarity of our description.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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