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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Field-Aligned Low-Energy O~+ Flux Enhancements in the Inner Magnetosphere Observed by Arase
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Field-Aligned Low-Energy O~+ Flux Enhancements in the Inner Magnetosphere Observed by Arase

机译：Field-Aligned低能O ~ +通量增强内磁气圈Arase观察到

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摘要

The present study examines the low-energy ion flux variations observed by the Arase satellite in the inner magnetosphere. From the magnetic field and ion flux data obtained by the fluxgate magnetometer and the low-energy particle experiments-ion mass analyzer onboard Arase, we find 55 events of the low-energy O~+ flux enhancement accompanied with magnetic field dipolarization in the periods of April 1-October 31, 2017 and July 1, 2018-January 31, 2019. The low-energy O~+ flux enhancements (a) start a few minutes after the dipolarization onset, (b) have energy-dispersed signatures with decreasing energy from a few keV down to ~10 eV, (c) are observed in both storm and non-storm periods, (d) have a field-aligned distribution (α ~ 0° in the southern hemisphere and α ~ 180° in the northern hemisphere), (e) are accompanied by the low-energy H+ flux enhancements that have lower energies than O~+ by a factor of 3-10, and (f) increase the O~+ density and the O~+/H+ density ratio by ~10 times and 4-5 times, respectively. We perform a numerical simulation to trace ion trajectories forward in time from the Arase positions. It is revealed that both H+ and O~+ ions drift eastward and reach the dawnto- morning sector without being lost in the ionosphere, if the pitch angle scattering effect is considered near the equatorial plane. This result suggests that these low-energy field-aligned ions can contribute to formation of the warm plasma cloak.
机译：本研究探讨了低能离子通量Arase卫星观测到的变化内部磁气圈。离子通量数据获得的磁通门磁强计和低能粒子experiments-ion质量分析仪上Arase,我们找到55低能O ~ +通量的事件增强伴随着磁场10月1日4月dipolarization的时期31日,2017年和2018年7月1日- 1月31日,2019年。低能O ~ +通量增强(a)开始分钟后dipolarization发作,(b)energy-dispersed签名与减少能量从几keV ~ 10 eV, (c)观察到在风暴和non-storm时期,(d)field-aligned分布(α~ 0°的南半球,在北方α~ 180°半球),(e)是伴随着的低能H +通量低增强能量比O ~ + 3 - 10倍,和(f)增加O ~ +密度和O ~ + / H +密度分别率~ 10倍和4 - 5倍。我们进行数值模拟跟踪离子从Arase轨迹前进的时间的位置。离子向东漂移,到达dawnto——早晨部门不迷失在电离层,如果螺旋角散射效应被认为是在赤道平面附近。这些低能field-aligned离子有助于形成温暖的等离子斗篷。

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