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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >MMS Examination of FTEs at the Earth's Subsolar Magnetopause
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MMS Examination of FTEs at the Earth's Subsolar Magnetopause

机译：MMS考试在地球的赤道的有限责任磁层

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Determining the magnetic field structure, electric currents, and plasma distributions within flux transfer event (FTE)-type flux ropes is critical to the understanding of their origin, evolution, and dynamics. Here the Magnetospheric Multiscale mission's high-resolution magnetic field and plasma measurements are used to identify FTEs in the vicinity of the subsolar magnetopause. The constant-α flux rope model is used to identify quasi-force free flux ropes and to infer the size, the core magnetic field strength, the magnetic flux content, and the spacecraft trajectories through these structures. Our statistical analysis determines a mean diameter of 1,700 ± 400 km (~30 ± 9 d_i) and an average magnetic flux content of 100 ± 30 kWb for the quasi-force free FTEs at the Earth's subsolar magnetopause which are smaller than values reported by Cluster at high latitudes. These observed nonlinear size and magnetic flux content distributions of FTEs appear consistent with the plasmoid instability theory, which relies on the merging of neighboring, small-scale FTEs to generate larger structures. The ratio of the perpendicular to parallel components of current density, R_J, indicates that our FTEs are magnetically force-free, defined as R_J < 1, in their core regions (<0.6 R_(flux rope)). Plasma density is shown to be larger in smaller, newly formed FTEs and dropping with increasing FTE size. It is also shown that parallel ion velocity dominates inside FTEs with largest plasma density. Field-aligned flow facilitates the evacuation of plasma inside newly formed FTEs, while their core magnetic field strengthens with increasing FTE size.
机译：确定磁场结构、电气电流和等离子体分布在通量传输事件(FTE)类型通量绳是至关重要的理解的起源、进化、和动力学。任务的高分辨率的磁场和等离子体测量是用来确定招聘附近的热带的磁层。常数-α通量绳模型是用于识别quasi-force自由通量绳和推断大小、磁场强度的核心磁通的内容,和宇宙飞船通过这些结构轨迹。统计分析确定平均直径1700±400公里(~ 30±9 d1)和平均磁通的100±30 kWb内容地球的赤道的quasi-force免费招聘值小于磁层报道了集群高纬度地区。观察到的非线性大小和磁通的内容分布有限责任的出现依赖于等离子粒团不稳定理论合并相邻,小规模的招聘产生更大的结构。垂直于并行组件的电流密度,R_J,表明我们的招聘磁自由定义为R_J < 1他们的核心区域(< 0.6 R_(通量绳))。密度是显示在更小、更大的新形成,招聘和增加FTE下降大小。主导内部招聘与最大的等离子体密度。疏散的等离子体在新成立的有限责任,而其核心磁场增强增加FTE大小。

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