MULTI-SPECIES MEASUREMENTS OF THE FIREHOSE AND MIRROR INSTABILITY THRESHOLDS IN THE SOLAR WIND
MULTI-SPECIES MEASUREMENTS OF THE FIREHOSE AND MIRROR INSTABILITY THRESHOLDS IN THE SOLAR WIND
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DOI：
10.3847/2041-8205/825/2/l26
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发表时间：
2016-07-10
影响因子：
7.9
通讯作者：
Bale, S. D.
中科院分区：
文献类型：
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作者：
Chen, C. H. K.;Matteini, L.;Bale, S. D.
水龙带和镜像不稳定性被认为出现在各种空间和天体物理等离子体中，限制了粒子种类之间的压力各向异性和漂移。血浆稳定性同时取决于所有物质，这意味着需要进行综合分析。在这里，我们提出了第一个这样的分析，在太阳风中，使用长波长的稳定性参数联合收割机的各向异性和漂移的所有主要物种（核心和束质子，阿尔法，和电子）。在阈值处，发现水龙带参数由质子（67%）主导，但也有来自电子（18%）和阿尔法（15%）的显著贡献。漂移也被发现是重要的，在质子束的存在下贡献57%。镜子也有类似的情况，质子、电子和阿尔法粒子的贡献分别为61%、28%和11%。然而，平行电场的贡献，被发现是小的9%。总的来说，长波长阈值很好地限制了数据（< 1%不稳定），并讨论了这一点的影响。
The firehose and mirror instabilities are thought to arise in a variety of space and astrophysical plasmas, constraining the pressure anisotropies and drifts between particle species. The plasma stability depends on all species simultaneously, meaning that a combined analysis is required. Here, we present the first such analysis in the solar wind, using the long-wavelength stability parameters to combine the anisotropies and drifts of all major species (core and beam protons, alphas, and electrons). At the threshold, the firehose parameter was found to be dominated by protons (67%), but also to have significant contributions from electrons (18%) and alphas (15%). Drifts were also found to be important, contributing 57% in the presence of a proton beam. A similar situation was found for the mirror, with contributions of 61%, 28%, and 11% for protons, electrons, and alphas, respectively. The parallel electric field contribution, however, was found to be small at 9%. Overall, the long-wavelength thresholds constrain the data well (< 1% unstable), and the implications of this are discussed.