The interplay of the solar wind proton core and halo populations: EMIC instability
The interplay of the solar wind proton core and halo populations: EMIC instability
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太阳风质子核心和晕圈群的相互作用：EMIC 不稳定性
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
A. El
中科院分区：
文献类型：
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作者：
S. M. Shaaban;M. Lazar;S. Poedts;A. El
太阳风质子（离子）的动力学性质，如它们的温度各向异性和由此产生的不稳定性，一般来说，只考虑质子核心（或热）人口的调查。超热晕成分的影响被最小化或忽略，尽管它们在太阳风中的存在不断被观测报告，而且它们的动能密度可能很大。无论它们起源于日冕还是太阳风，高能粒子都可能是由等离子体湍流加速或自发波动对流动质子的俯仰角散射产生的。因此，日球层中超高温质子的存在暗示了共振相互作用的直接含义，例如，朗道和回旋加速器，等离子体粒子。本文介绍了质子核心和超热晕的相互作用的第一次调查的结果，当这两个人口可能表现出温度各向异性，不稳定的电磁离子（质子）回旋（EMIC）模式。这些结果清楚地表明，在太阳风中遇到的典型条件下，超温流的影响可能比核心驱动的影响更重要。值得注意的是，核心和晕成分的累积效应也显著改变了不稳定性条件。
The kinetic properties of the solar wind protons (ions), like their temperature anisotropy and the resulting instabilities, are, in general, investigated considering only the proton core (or thermal) populations. The implication of the suprathermal halo components is minimized or just ignored, despite the fact that their presence in the solar wind is continuously reported by the observations, and their kinetic energy density may be significant. Whether they are originating in the corona or solar wind, the energetic particles may result from acceleration by the plasma turbulence or from the pitch angle scattering of the streaming protons by the self‐generated fluctuations. The presence of suprathermal protons in the heliosphere suggests, therefore, a direct implication in resonant interactions, e.g., Landau and cyclotron, with plasma particles. This paper presents the results of a first investigation on the interplay of the proton core and suprathermal halo, when both these two populations may exhibit temperature anisotropies, which destabilize the electromagnetic ion (proton) cyclotron (EMIC) modes. These results clearly show that for conditions typically encountered in the solar wind, the effects of the suprathermals can be more important than those driven by the core. Remarkable are also the cumulative effects of the core and halo components, which change dramatically the instability conditions.