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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Statistical Study of Oxygen Ions Abundance and Spatial Distribution in the Dayside Magnetopause Boundary Layer: MMS Observations
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Statistical Study of Oxygen Ions Abundance and Spatial Distribution in the Dayside Magnetopause Boundary Layer: MMS Observations

机译：氧离子丰度的统计研究空间分布的光面的磁层边界层:MMS的观察

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Using energetic ion composition data at the dayside magnetopause measured by Magnetospheric Multiscale (MMS) satellites, we study the responses of H~+, O~+ density (1-40 keV), and their ratio to geomagnetic activity and solar wind conditions; their spatial distributions in the XYGSM plane for different ranges of the above parameters are presented as well. The dependencies of the H~+ and O~+ fluxes spatial distributions on different energy ranges are also investigated. Statistical results show that the dependencies of the H~+ density on SYM-H index, IMF By, and IMF Bz are weak, while the O~+ density and its abundance (O~+/H~+) vary with SYM-H index and solar wind dynamic pressure exponentially. The IMF directions not only affect the O~+ density and its abundance but also play a major role in their spatial distributions. The O~+ density shows duskside asymmetry under southward IMF with positive IMF By and shows dawnside asymmetry under northward IMF with negative IMF By. The influence of the dawn-dusk IMF direction on dawn-dusk asymmetry is significant. The positive and negative IMF By can strengthen the O~+ duskside asymmetry and dawnside asymmetry when the IMF is southward and northward, respectively. Otherwise, as particle energy enhances from ~10 to ~35 keV, the H~+ fluxes concentrate more on the duskside magnetopause boundary layer while the O~+ fluxes dawn-dusk asymmetry shows minor difference. This suggests that the H~+ and O~+ at energies below 40 keV experience different processes when they are transported to the dayside magnetopause boundary layer.
机译：使用高能离子成分数据的光面磁层磁性层的测量多尺度(MMS)卫星,我们研究反应H ~ +, O ~ +密度第1 - 40(凯文),他们的比率地磁活动和太阳能风条件;上面的XYGSM平面的不同范围参数。依赖的H ~ +和O ~ +通量的空间分布在不同的能量范围也调查。依赖SYM-H H ~ +密度的指数,国际货币基金组织(IMF),和IMF Bz疲软,而O ~ +密度及其丰度(O ~ + / H ~ +)随太阳风SYM-H指数和动态压力指数增长。O ~ +密度及其丰富但也发挥了重要的角色在他们的空间分布。O ~ +密度显示duskside不对称南国际货币基金组织的积极组织和显示dawnside不对称下国际货币基金组织(IMF)向北-国际货币基金组织的。国际货币基金组织(IMF)方向dawn-dusk不对称有很重要的意义。加强O ~ + duskside不对称当国际货币基金组织(IMF)向南,dawnside不对称分别向北。从~ 10 ~ 35 keV能量增强,H ~ +通量更专注于duskside磁层边界层O ~ +通量dawn-dusk不对称显示轻微的差别。表明,H ~ +和O ~ +能量低于40 keV经验时不同的过程被运送到了的光面磁边界层。

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