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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Turbulence in Three-Dimensional Simulations of Magnetopause Reconnection
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Turbulence in Three-Dimensional Simulations of Magnetopause Reconnection

机译：动荡的三维模拟磁重联

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摘要

We present detailed analysis of the turbulence observed in three-dimensional particle-in-cell simulations of magnetic reconnection at the magnetopause. The parameters are representative of an electron diffusion region encounter of the Magnetospheric Multiscale (MMS) mission. The turbulence is found to develop around both the magnetic X line and separatrices, is electromagnetic in nature, is characterized by a wave vector k given by kρ_e ~ (meTe∕miTi)0.25 with ρ_e the electron Larmor radius, and appears to have the ion pressure gradient as its source of free energy. Taken together, these results suggest the instability is a variant of the lower hybrid drift instability. The turbulence produces electric field fluctuations in the out-of-plane direction (the direction of the reconnection electric field) with an amplitude of around ±10 mV/m, which is much greater than the reconnection electric field of around 0.1 mV/m. Such large values of the out-of-plane electric field have been identified in the MMS data. The turbulence in the simulations controls the scale lengths of the density profile and current layers in asymmetric reconnection,driving them closer to√ρ_eρ_i than the ρ_e or de scalings seen in 2-D reconnection simulations, and produces significant anomalous resistivity and viscosity in the electron diffusion region.
机译：我们目前的动荡的详细分析观察到三维particle-in-cell模拟在磁场重联的磁层。电子的扩散区域遇到的磁性层的多尺度(MMS)的使命。发现湍流发展的磁性X线和分界线电磁性质,特点是a波矢k, kρ_e ~(给予∕通商)0.25用ρ_e电子拉莫尔半径,出现了离子压力梯度作为其来源的自由能。建议不稳定性降低的一种变体混合漂移不稳定性。出平面电场波动方向(的方向重新连接电场)的幅值在±10mV / m,这远远大于重新连接电场的约0.1 mV / m。的出平面电场值被确认在MMS数据。在模拟控制的规模的长度密度剖面和当前层不对称的重新连接,把他们接近以√ρ_eρ_i比ρ_e或二维德落下的石块重新连接模拟和生产重要的反常电阻率和粘度在电子扩散区域。

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