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MMS Observations of the Multiscale Wave Structures and Parallel Electron Heating in the Vicinity of the Southern Exterior Cusp

机译:MMS观测的多尺度波结构和并行电子加热附近的南外尖端

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Understanding the physical mechanisms responsible for the cross-scale energy transport and plasma heating from solar wind into the Earth's magnetosphere is of fundamental importance for magnetospheric physics and for understanding these processes in other places in the universe with comparable plasma parameter ranges. This paper presents observations from the Magnetosphere Multiscale (MMS) mission at the dawn-side high-latitude dayside boundary layer on February 25, 2016 between 18:55 and 20:05 UT. During this interval, MMS encountered both the inner and outer boundary layers with quasiperiodic low frequency fluctuations in all plasma and field parameters. The frequency analysis and growth rate calculations are consistent with the Kelvin-Helmholtz instability (KHI). The intervals within the low frequency wave structures contained several counter-streaming, low- (0–200 eV) and mid-energy (200 eV–2 keV) electrons in the loss cone and trapped energetic (70–600 keV) electrons in alternate intervals. The counter-streaming electron intervals were associated with large-magnitude field-aligned Poynting fluxes. Burst mode data at the large Alfvén velocity gradient revealed a strong correlation between counter streaming electrons, enhanced parallel electron temperatures, strong antifield aligned wave Poynting fluxes, and wave activity from sub-proton cyclotron frequencies extending to electron cyclotron frequency. Waves were identified as Kinetic Alfvén waves but their contribution to parallel electron heating was not sufficient to explain the >100 eV electrons, and rapid nonadiabatic heating of the boundary layer as determined by the characteristic heating frequency, derived here for the first time.
机译:理解责任的物理机制上的跨能源运输和等离子体从太阳风加热到地球磁气圈的关键磁性层的物理和理解这些过程在宇宙的其他地方进行与类似的等离子体参数范围。提出了观察的磁气圈多尺度(MMS)的任务dawn-side高纬度的光面边界层2016年2月25日18:55和20:05 UT之间。在这个时间间隔内,MMS遇到的内部和外部边界层准周期的低频波动等离子体和现场参数。分析和增长率计算符合Kelvin-Helmholtz不稳定(地块)。波结构包含几个counter-streaming,低- (0 - 200 eV)和mid-energy(200 eV-2 keV)损失锥和电子困精力充沛(70 - 600 keV)电子交替间隔。电子的间隔是相关联的高震级field-aligned坡印亭通量。在大阿尔芬突发模态数据的速度梯度显示强烈的相关性反流电子,增强平行电子温度,强antifield对齐波能流密度通量和波活动sub-proton回旋频率扩展电子回旋频率。确认为动力学阿尔芬波但他们贡献电子加热不平行足以解释> 100电动汽车电子,和边界层的快速非绝热加热由加热特征第一次频率,导出来。

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