Radial evolution of the properties of small-scale magnetic flux ropes in the solar wind
Radial evolution of the properties of small-scale magnetic flux ropes in the solar wind
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DOI：
10.1088/1742-6596/1332/1/012005
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发表时间：
2019-11
期刊：
影响因子：
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通讯作者：
Q. Hu;Yu Chen;J. A. Roux
中科院分区：
文献类型：
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作者：
Q. Hu;Yu Chen;J. A. Roux
小尺度磁通绳在太阳风中普遍存在，大多数在1 Au处持续时间≤ 1小时。我们已经建立了一个事件数据库（fluxrope.info）为这些结构确定和总结其主要的物理性质。定量分析提供了强有力的证据，支持它们是通过空间等离子体中的湍流级联过程产生的观点。我们扩展这样的分析，航天器的测量在较大的径向距离，主要是那些从航天器使命。我们对这些结构的相关性质进行了比较，揭示了它们在黄道面附近的径向演化。同时，我们也试图定量地推导出湍流级联中包含磁场重联在内的一些重要的基本过程参数，以辅助相关的理论研究。我们还补充了大量的统计分析结果与个别的案例研究，以说明通过观测方法的磁通绳合并和相关的粒子的签名的过程。我们推测我们的研究结果的影响，并预见未来的调查，可以帮助提高我们目前的理解，这些小规模的磁通量绳在整个日光层的起源和演变。
Small-scale magnetic flux ropes, most with duration ≤ 1 hour at 1 AU, are found to be ubiquitous in the solar wind from in-situ spacecraft measurements. We have built an event database (fluxrope.info) for these structures identified and summarized their main physical properties. Quantitative analysis provided strong evidence in support of the view of their generation through turbulence cascade processes in space plasmas. We extend such analysis to spacecraft measurements at larger radial distances, mainly those from the Ulysses spacecraft mission. We perform comparison of relevant properties of these structures and reveal their radial evolution near the ecliptic plane. Meanwhile we also try to derive, quantitatively, the parameters important for the underlying processes including magnetic reconnection, intrinsic to turbulence cascade, in order to aid in relevant theoretical investigations. We also supplement the largely statistical analysis results with individual case studies to illustrate the process of flux rope merging and associated particle energization signatures through an observational approach. We speculate on the implications of our results and foresee future investigations that can help improve our current understanding of the origin and evolution of these small-scale magnetic flux ropes throughout the heliosphere.