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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Cluster observations of electrostatic solitary waves near the Earth's bow shock
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Cluster observations of electrostatic solitary waves near the Earth's bow shock

机译：集群的观察静电孤独地球的弓形激波附近的波

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摘要

Using a period of internal burst mode data from the Cluster Electric Field and Wave instrument a number of electrostatic solitary structures have been identified in the foot region of Earth's quasi-perpendicular bow shock. The four individual probe potential measurements are utilized to investigate the fundamental characteristics of the solitary wave structures such as wave propagation vector, propagation velocity, scale-size and potential amplitude. Two classes of waves are observed. Bipolar solitary waves typically propagate in the solar wind direction toward the shock but at a significant angle from the ambient magnetic field. Unipolar/tripolar solitary waves tend to propagate along the ambient magnetic field. The wave amplitude-scale size relation is similar to that obtained for similar structures observed in the auroral zone. The structures lie in the theoretically allowed region in width-amplitude space to be consistent with the BGK ion holes. Using a period of internal burst mode data from the Cluster Electric Field and Wave instrument a number of electrostatic solitary structures have been identified in the foot region of Earth's quasi-perpendicular bow shock. The four individual probe potential measurements are utilized to investigate the fundamental characteristics of the solitary wave structures such as wave propagation vector, propagation velocity, scale-size and potential amplitude. Two classes of waves are observed. Bipolar solitary waves typically propagate in the solar wind direction toward the shock but at a significant angle to the ambient magnetic field in contrast to most previous studies which assume parallel propagation to the ambient magnetic field. In contrast, unipolar/tripolar solitary waves tend to propagate along the ambient magnetic field. The wave amplitude-scale size relation is similar to that obtained for structures observed in the auroral zone. The structures lie in the theoretically allowed region in width-amplitude space to be consistent with the BGK (Bernstein-Greene-Kruskal) ion holes. The two classes of observed solitary waves may greatly influence the ambient plasma dynamics around the shock. The bipolar solitary waves do not exhibit a large net potential difference but may still play an important role in plasma thermalisation by particle scattering. Unipolar/tripolar solitary waves exhibit a remarkable net potential difference that may be responsible for the plasma energisation along the ambient magnetic field.
机译：使用一段时间的内部破裂模式的数据集群电场和波仪器静电孤独的结构被确认的脚地区地球的quasi-perpendicular弓形激波。个人调查潜在的测量利用调查的根本孤波结构的特征如波传播媒介、传播速度、比例尺和潜在的振幅。波的类。波通常在太阳风传播方向的冲击,但意义重大从环境角度磁场。单极/三极的孤波往往沿着周围的磁场传播。波幅度刻度大小类似于关系获得了相似结构中观察到极光区。理论上width-amplitude允许地区空间与BGK离子孔一致。使用一段时间的内部破裂模式的数据集群电场和波仪器静电孤独的结构被确认的脚地区地球的quasi-perpendicular弓形激波。个人调查潜在的测量利用调查的根本孤波结构的特征如波传播媒介、传播速度、比例尺和潜在的振幅。波的类。波通常在太阳风传播方向的冲击,但意义重大环境磁场的角度对比大多数以前的研究认为平行传播到周围的磁场。相反,单极/三极的孤波往往沿着周围的磁场传播。波幅度刻度的大小关系是相似的获得了结构中观察到极光区。理论上width-amplitude允许地区空间与BGK一致(Bernstein-Greene-Kruskal)离子洞。观察孤波的类可能很大影响周围的环境等离子体动力学冲击。大净电位差但仍可能在等离子体thermalisation发挥重要的作用通过粒子散射。孤波表现出显著的净的潜力可能负责等离子体的区别energisation沿着周围的磁场。

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