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arXiv 1003.1624physics.plasm-phphysics.space-ph
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圆柱对称流中驱动的非线性离子声(IA)波

Nonlinear ion-acoustic (IA) waves driven in a cylindrically symmetric flow

John Z. G. Ma

摘要:

采用自相似的双流体磁流体模型,研究了空间等离子体中沿外磁场线方向传播的非线性离子声波的特性。数值计算不仅揭示了已知的三种形状的非线性结构(正弦,双曲,尖峰或双极),这是由许多卫星观测和模拟的笛卡尔几何模型,但也阐明了新的结果,如两个双传播的非线性波,密度骤降和驼峰,发散和收敛的电击等。

英文摘要:

By employing a self-similar, two-fluid MHD model in a cylindrical geometry, we study the features of nonlinear ion-acoustic (IA) waves which propagate in the direction of external magnetic field lines in space plasmas. Numerical calculations not only expose the well-known three shapes of nonlinear structures (sinusoidal, sawtooth, and spiky or bipolar) which are observed by numerous satellites and simulated by models in a Cartesian geometry, but also illustrate new results, such as, two reversely propagating nonlinear waves, density dips and humps, diverging and converging electric shocks, etc. A case study on Cluster satellite data is also introduced.

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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