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Kelvin–Helmholtz Instability: Lessons Learned and Ways Forward
Space Science Reviews ( IF 10.3 ) Pub Date : 2018-04-24 , DOI: 10.1007/s11214-018-0505-6
A. Masson , K. Nykyri

The Kelvin–Helmholtz instability (KHI) is a ubiquitous phenomenon across the Universe, observed from 500 m deep in the oceans on Earth to the Orion molecular cloud. Over the past two decades, several space missions have enabled a leap forward in our understanding of this phenomenon at the Earth’s magnetopause. Key results obtained by these missions are first presented, with a special emphasis on Cluster and THEMIS. In particular, as an ideal instability, the KHI was not expected to produce mass transport. Simulations, later confirmed by spacecraft observations, indicate that plasma transport in Kelvin–Helmholtz (KH) vortices can arise during non-linear stage of its development via secondary process. In addition to plasma transport, spacecraft observations have revealed that KHI can also lead to significant ion heating due to enhanced ion-scale wave activity driven by the KHI. Finally, we describe what are the upcoming observational opportunities in 2018–2020, thanks to a unique constellation of multi-spacecraft missions including: MMS, Cluster, THEMIS, Van Allen Probes and Swarm.

中文翻译:

开尔文-亥姆霍兹不稳定性:经验教训和前进方向

开尔文-亥姆霍兹不稳定性 (KHI) 是整个宇宙中普遍存在的现象,从地球海洋深处 500 米到猎户座分子云都可以观察到。在过去的二十年里,几次太空任务使我们对地球磁层顶现象的理解有了飞跃。首先介绍这些任务获得的主要结果,特别强调集群和 THEMIS。特别是,作为理想的不稳定性,KHI 预计不会产生大规模传输。后来由航天器观测证实的模拟表明,开尔文-亥姆霍兹 (KH) 涡流中的等离子体传输可以通过二次过程在其发展的非线性阶段产生。除了血浆运输,航天器观测表明,由于 KHI 驱动的离子尺度波活动增强,KHI 还可能导致显着的离子加热。最后,我们描述了 2018-2020 年即将到来的观测机会,这要归功于独特的多航天器任务星座,包括:MMS、Cluster、THEMIS、Van Allen Probes 和 Swarm。
更新日期:2018-04-24
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