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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >NonlinearWave-Particle Interaction: Implications for Newborn Planetary and Backstreaming Proton Velocity Distribution Functions
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NonlinearWave-Particle Interaction: Implications for Newborn Planetary and Backstreaming Proton Velocity Distribution Functions

机译：NonlinearWave-Particle交互:影响为新生行星和逆流质子速度分布函数

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摘要

Seen from the solar wind (SW) reference frame, the presence of newborn planetary protons upstream from the Martian and Venusian bow shocks and SW protons reflected from each of them constitutes two sources of nonthermal proton populations. In both cases, the resulting proton velocity distribution function is highly unstable and capable of giving rise to ultralow frequency quasi-monochromatic electromagnetic plasma waves. When these instabilities take place, the resulting nonlinear waves are convected by the SW and interact with nonthermal protons located downstream from the wave generation region (upstream from the bow shock), playing a predominant role in their dynamics. To improve our understanding of these phenomena, we study the interaction between a charged particle and a large-amplitude monochromatic circularly polarized electromagnetic wave propagating parallel to a background magnetic field, from first principles. We determine the number of fix points in velocity space, their stability, and their dependence on different wave-particle parameters. Particularly, we determine the temporal evolution of a charged particle in the pitch angle-gyrophase velocity plane under nominal conditions expected for backstreaming protons in planetary foreshocks and for newborn planetary protons in the upstream regions of Venus and Mars. In addition, the inclusion of wave ellipticity effects provides an explanation for pitch angle distributions of suprathermal protons observed at the Earth's foreshock, reported in previous studies. These analyses constitute a mean to evaluate if nonthermal proton velocity distribution functions observed at these plasma environments present signatures that can be understood in terms of nonlinear wave-particle processes.
机译：从太阳风(SW)参考系新生行星质子上游的存在火星和金星的弓形激波和西南从他们每个人构成质子反映两个来源的非热能的质子数量。这两种情况下,由此产生的质子的速度分布函数是高度不稳定的和能够引起超低频quasi-monochromatic电磁等离子体波。当这些不稳定,产生的非线性波由西南迁移和与非热能的质子从波代地区下游(从弓形激波上游),玩主要角色在他们的动态。我们对这些现象的理解,我们的研究带电粒子和之间的交互大幅度单色圆极化电磁波传播背景磁场,平行第一个原则。点在速度空间,稳定,他们依赖不同的波粒参数。带电粒子的演化距angle-gyrophase速度下飞机标称条件下回流质子在行星前震和新生儿行星质子的上游地区金星和火星。波椭圆率的影响提供了一个解释suprathermal的螺旋角分布质子观察到地球的前震,在以前的研究报道。构成的意思是如果非热能的评估质子的速度分布函数在这些等离子体环境中签名可以被理解的非线性波粒的过程。

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