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arXiv 0906.2830physics.plasm-phphysics.space-ph
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无碰撞等离子体turbulence中的整体标度不变耗散

Global scale-invariant dissipation in collisionless plasma turbulence

K. H. Kiyani, S. C. Chapman, Yu. V. Khotyaintsev, M. W. Dunlop

摘要:

利用在快速环境太阳风的静止间隔中从Cluster航天器现场高频磁场测量,提出了无碰撞等离子体湍流耗散范围的高阶多尺度分析。的观测,跨越50年的时间尺度,显示了从多重分形间歇性湍流的惯性范围内的非高斯单尺度的耗散范围内的交叉。这对湍流无碰撞等离子体中的耗散机制理论提出了一个强有力的观测约束。

英文摘要:

A higher-order multiscale analysis of the dissipation range of collisionless plasma turbulence is presented using in-situ high-frequency magnetic field measurements from the Cluster spacecraft in a stationary interval of fast ambient solar wind. The observations, spanning five decades in temporal scales, show a crossover from multifractal intermittent turbulence in the inertial range to non-Gaussian monoscaling in the dissipation range. This presents a strong observational constraint on theories of dissipation mechanisms in turbulent collisionless plasmas.

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