Kinetic Plasma Turbulence: Recent Insights and Open Questions From 3D3V Simulations
Kinetic Plasma Turbulence: Recent Insights and Open Questions From 3D3V Simulations
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DOI：
10.3389/fspas.2019.00064
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发表时间：
2019-10-11
影响因子：
3
通讯作者：
Franci, Luca
中科院分区：
文献类型：
--
作者：
Cerri, Silvio Sergio;Groselj, Daniel;Franci, Luca
在过去的几十年里，通过航天器现场测量、理论模型和数值模拟，对磁化空间等离子体中的湍流和动力学过程进行了广泛的研究。特别是，来自Cluster和MMS空间任务的多点高分辨率测量揭示了在等离子体动力学尺度上发生的整个新的过程世界，并暴露了对其理论解释的新挑战。关于太阳风湍流中离子和电子尺度波动的性质及其通过无碰撞等离子体机制的耗散，存在着长期的争论。除了观察之外，数值模拟在为现有理论和模型提供测试基础方面始终发挥着核心作用。在这个角度来看，我们讨论了我们的3D 3V（减少和完全）动力学模拟所取得的进展，以及这些研究留下的主要问题（或提出）。为此，我们结合联合收割机的数据，从我们最近的动力学模拟的自由衰减和连续驱动的波动，以评估的相似性和/或差异的等离子体湍流的属性在子离子范围。最后，我们讨论了该领域未来可能的发展方向，并强调需要联合收割机结合不同类型的数值和观测方法，以提高对湍流空间等离子体的理解。
Turbulence and kinetic processes in magnetized space plasmas have been extensively investigated over the past decades via in-situ spacecraft measurements, theoretical models and numerical simulations. In particular, multi-point high-resolution measurements from the Cluster and MMS space missions brought to light an entire new world of processes, taking place at the plasma kinetic scales, and exposed new challenges for their theoretical interpretation. A long-lasting debate concerns the nature of ion and electron scale fluctuations in solar-wind turbulence and their dissipation via collisionless plasma mechanisms. Alongside observations, numerical simulations have always played a central role in providing a test ground for existing theories and models. In this Perspective, we discuss the advances achieved with our 3D3V (reduced and fully) kinetic simulations, as well as the main questions left open (or raised) by these studies. To this end, we combine data from our recent kinetic simulations of both freely decaying and continuously driven fluctuations to assess the similarities and/or differences in the properties of plasma turbulence in the sub-ion range. Finally, we discuss possible future directions in the field and highlight the need to combine different types of numerical and observational approaches to improve the understanding of turbulent space plasmas.