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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Formation and disruption of current filaments in a flow-driven turbulent magnetosphere
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Formation and disruption of current filaments in a flow-driven turbulent magnetosphere

机译：电流细丝的形成和破坏flow-driven动荡的磁气圈

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摘要

Recent observations have established that the magnetosphere is a system of natural complexity. The coexistence of multiscale structures such as auroral arcs, turbulent convective flows, and scale-free distributions of energy perturbations has lacked a unified explanation, although there is strong reason to believe that they all stem from a common base of physics. In this paper we show that a slow but turbulent convection leads to the formation of multiscale current filaments reminiscent of auroral arcs. The process involves an interplay between random shuffling of field lines and dissipation of magnetic energy on sub-MHD scales. As the filament system reaches a critical level of complexity, local current disruption can trigger avalanches of energy release of varying sizes, leading to scale-free distributions over energy perturbation, power, and event duration. A long-term memory effect is observed whereby the filament system replicates itself after each avalanche. The results support the view that that the classical and inverse cascades operate simultaneously in the magnetosphere. In the former, the high Reynolds number plasma flow disintegrates into turbulence through successive breakdowns; in the latter, the interactions of small-scale flow eddies with the magnetic field can self-organize into elongated current filaments and large-scale energy avalanches mimicking the substorm.
机译：最近的观察证实了磁气圈是一个自然系统的复杂性。共存的多尺度结构等极光弧、湍流对流流动无标度分布的能量扰动缺乏一个统一的解释,尽管那里强有力的理由相信他们都干什么从一个共同的物理基础。表明,缓慢但湍流对流线索多尺度的形成电流细丝让人想起极光弧。随机洗牌的领域之间的相互作用线条和磁性能量耗散sub-MHD鳞片。临界水平的复杂性,局部电流破坏会引发雪崩的能量大小不同的释放,导致无标度分布在能源扰动、电力、和事件持续时间。观察到,灯丝系统复制每次雪崩后本身。认为,古典和逆级联操作的同时磁气圈。等离子体分解流入动荡通过连续的故障;小规模的旋涡流动的相互作用磁场可以自组织成细长当前的细丝和大规模的能源雪崩模仿亚暴。

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