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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Oxygen Ions O~+ Energized by Kinetic Alfvén Eigenmode During Dipolarizations of Intense Substorms
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Oxygen Ions O~+ Energized by Kinetic Alfvén Eigenmode During Dipolarizations of Intense Substorms

机译：氧离子动力学阿尔芬O ~ +精力充沛在Dipolarizations强烈的固有模式亚暴的

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摘要

Singly charged oxygen ions, O~+, energized by kinetic Alfvén wave eigenmode (KAWE) in the plasma sheet boundary layer during dipolarizations of two intense substorms, 10:07 UT on 31 August 2004 and 18:24 UT on 14 September 2004, are investigated by Cluster spacecraft in the magnetotail. It is found that after the beginning of the expansion phase of substorms, O~+ ions are clearly energized in the direction perpendicular to the magnetic field with energy larger than 1 keV in the near-Earth plasma sheet during magnetic dipolarizations. The pitch angle distribution of these energetic O~+ ions is significantly different from that of O~+ ions with energy less than 1 keV before substorm onset that is in the quasi-parallel direction along the magnetic field. The KAWE with the large perpendicular unipolar electric field, E_z ~ -20 mV/m,significantly accelerates O~+ ions in the direction perpendicular to the background magnetic field. We present good evidences that O~+ ion origin from the ionosphere along the magnetic field line in the northward lobe can be accelerated in the perpendicular direction during substorm dipolarizations. The change of the move direction of O~+ ions is useful for O~+ transferring from the lobe into the central plasma sheet in the magnetotail. Thus, KAWE can play an important role in O~+ ion transfer process from the lobe into the plasma sheet during intense substorms.
机译：单氧离子,O ~ +,精力充沛动力学阿尔芬波固有模式(KAWE)等离子体片边界层中dipolarizations两个强烈的为亚暴,10:07但2004年8月31日,9月14日18:24 UT2004年,由集群航天器在调查磁尾。亚暴的扩张阶段的开始,O ~ +离子显然是精力充沛的方向垂直于磁场能量大于1 keV的近地等离子板在磁dipolarizations。这些精力充沛的O ~ +离子的分布显著不同于O ~ +离子与能量小于1 keV亚暴出现之前这是quasi-parallel方向沿磁场。垂直的电场,E_z ~ -20mV / m,显著加速O ~ +离子方向垂直于背景磁场。O ~ +离子从电离层的起源磁场线向北叶在垂直方向上加速亚暴dipolarizations。方向O ~ +离子有助于O ~ +从叶转移到中央在磁尾等离子体片。发挥重要作用在O ~ +离子转移从叶到等离子体片过程在强烈的亚暴的。

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