圆极化Alfven波的动力学修正参数不稳定性：离子动力学效应
Kinetically modified parametric instabilities of circularly-polarized Alfven waves: Ion kinetic effects
摘要：
在离子和无质量电子流体的一维Vlasov描述的框架内，研究了均匀背景等离子体中平行传播的圆偏振有限振幅Alfven波的参数不稳定性，从而包含了纵向动力学扰动（离子朗道阻尼）。本发明的制剂还包括霍尔效应。所得结果与以往的相关分析吻合较好，表明当纵向动力学效应“被动”作用时，纵向动力学效应在Alfven波的参数不稳定性中起重要作用。此外，存在的动力学参数不稳定性被确认为小子波波的制度。这些不稳定性的增长率是敏感的离子温度。本文的公式和结果可应用于在太阳风和地球前震区观测到的阿尔芬波。
英文摘要：
Parametric instabilities of parallel propagating, circularly polarized finite amplitude Alfven waves in a uniform background plasma is studied, within a framework of one-dimensional Vlasov description for ions and massless electron fluid, so that kinetic perturbations in the longitudinal direction (ion Landau damping) are included. The present formulation also includes the Hall effect. The obtained results agree well with relevant analysis in the past, suggesting that kinetic effects in the longitudinal direction play essential roles in the parametric instabilities of Alfven waves when the kinetic effects react "passively". Furthermore, existence of the kinetic parametric instabilities is confirmed for the regime with small wave number daughter waves. Growth rates of these instabilities are sensitive to ion temperature. The formulation and results demonstrated here can be applied to Alfven waves observed in the solar wind and in the earth's foreshock region.
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