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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >MMS Observations of Broadband Electrostatic Waves in Electron Diffusion Region of Magnetotail Reconnection
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MMS Observations of Broadband Electrostatic Waves in Electron Diffusion Region of Magnetotail Reconnection

机译：MMS的观察宽带静电波在电子扩散磁尾的地区重新连接

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摘要

In this study, the broadband electrostatic waves are observed in electron diffusion region (EDR). Detailed analysis has shown that the parallel electric field of these waves have a bipolar or continuous steepening waveform. The bipolar structures of the parallel electric field are usually accompanied by electron holes (EHs) in phase space. The parallel spatial scales l_|| of EHs are ~3–5 λ_D (λ_D is the Debye length), and the perpendicular spatial scales l_⊥ are larger than ~18.6 λ_D. Therefore, the length ratios l_⊥ / l_|| are larger than ~3.7–6.2, which means that the EHs have oblate shapes. Associated with these plasma waves, electron beams propagating away from the X-line have been observed. By performing a onedimensional (1-D) electrostatic particle-in-cell simulation of the bump-on-tail instability, we reproduce two types of waveforms similar to those observed in the EDR during the different evolution stage of the instability, which implies that these electrostatic waves are generated by the bump-on-tail instabilities.
机译：在这项研究中,宽带静电波观察到在电子扩散区域(EDR)。详细的分析表明,平行这些波有一个双极或电场持续趋陡波形。结构的平行电场通常伴随着电子洞(EHs)相空间。EHs ~ 3 - 5λ_D(λ_D德拜长度),和垂直空间尺度上l_⊥更大比~ 18.6λ_D。/ l_ | |大于-6.2 ~ 3.7,这意味着EHs扁形状。等离子体波,电子束传播从x轴被观察到。一些(一维)静电particle-in-cell bump-on-tail的模拟不稳定,我们复制两种类型的波形中所观察到的类似的功能不同的进化阶段的不稳定,这意味着这些静电电波吗bump-on-tail产生的不稳定。

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