由alfvsamn波泵送的向上流动的氧离子的大规模倒v通道

IF 2.9 3区 地球科学 Earth and Planetary Physics Pub Date : 2023-01-01 DOI:10.26464/epp2023082
Hui Zhang, Jun Zhong, SuiYan Fu, ZuYin Pu, Yong Wei, Lun Xie, LiBo Liu and Qi’an Chen
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引用次数: 0

摘要

在地球高纬度电离层的开闭场线边界附近,在所有当地时间的Cluster数据中,经常发现大尺度的倒v型氧离子上涌通道。这些能谱结构通常与向下传播的MHD alfv录影带波同时发生,这些波已经级联进入等离子体的动力学区,结构中心的氧离子的横向加速度被解释为这些波沿通道的综合能量。在通道内也观察到向上平行的电场,这是动态alfvsamn波的一个关键特征,这不仅有助于提升离子,而且还会沉淀极光电子,这可能会引发离子在下面的电离层向上流动。Cluster五年观测的统计数据表明,通道通常在地磁扰动期间形成,特别是在太阳风动压高或高度波动时。在开闭场线边界附近,波功率越强,向上的氧通量越高,波束能量也越高,说明这些波提供了一种简单而有效的驱动氧向上流动的方式。
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Large-scale inverted-V channels of upflowing oxygen ions pumped by Alfvén waves
Large-scale inverted-V channels of upflowing oxygen ions are frequently identified out of the data of Cluster at all the local time near the open-closed field line boundary over Earth’s high-latitude ionospheres. These energy spectrum structures generally cooccurred with downward propagating MHD Alfvén waves which had cascaded down into kinetic regime of plasma, and the transverse acceleration of the oxygen ions in the center of the structures are interpreted as the integrated energization by these waves along the channels. Upward parallel electric fields, a key characteristic of kinetic Alfvén waves, are also observed within the channels, which may not only contribute to lift the ions but also precipitate aurora electrons that might initiate the ion upflow in the ionosphere below. Statistics on five-year observations of Cluster show that the channels typically form during geomagnetic perturbations, particularly when solar wind dynamic pressure is high or highly fluctuated. Near the open-closed field line boundary, the stronger the wave power, the higher the upward oxygen flux and the higher the beam energy, indicating that these waves provide a simple but efficient way to drive the oxygen upflows.
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来源期刊
Earth and Planetary Physics
Earth and Planetary Physics GEOSCIENCES, MULTIDISCIPLINARY-
自引率
17.20%
发文量
174
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