Energization of the Ring Current by Substorms.
Energization of the Ring Current by Substorms.
复制标题
亚暴对环流的激发。
DOI：
10.1029/2018ja025766
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Sandhu JK
中科院分区：
文献类型：
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作者：
Sandhu JK
亚暴过程向磁层系统释放了大量的能量，尽管能量转移到哪里以及如何分配仍然是一个悬而未决的问题。在这项研究中，我们解决亚暴过程是否贡献了大量的能量的环电流。环电流是一个高度可变的区域，了解亚暴-环电流耦合如何有助于风暴条件的产生，并为波浪驱动提供能量来源，这对理解亚暴-环电流耦合过程提供了有价值的见解。为了量化的能量输入到环电流在亚暴过程中，我们分析了辐射带风暴探针离子成分实验和氦氧质子电子离子通量测量H+，O+，和He+。环电流的能量含量的估计和装箱空间为土地磁本地时。的结果相结合，与独立推导的亚暴事件列表进行统计分析的环电流能量含量与亚暴阶段的变化。我们发现，环电流的能量是显着更高的扩张阶段相比，增长阶段，持续到亚暴恢复阶段的能量增强。的能量增强的特点表明，注入带电离子从尾部等离子体片亚暴开始。当地时间的变化表明下午部分的高能H+离子的损失，可能是由于波粒相互作用。总的来说，我们发现，输入到环电流的平均能量是以前报道的亚暴期间释放的能量的1.9%。
The substorm process releases large amounts of energy into the magnetospheric system, although where the energy is transferred to and how it is partitioned remains an open question. In this study, we address whether the substorm process contributes a significant amount of energy to the ring current. The ring current is a highly variable region, and understanding the energization processes provides valuable insight into how substorm‐ring current coupling may contribute to the generation of storm conditions and provide a source of energy for wave driving. In order to quantify the energy input into the ring current during the substorm process, we analyze Radiation Belt Storm Probes Ion Composition Experiment and Helium Oxygen Proton Electron ion flux measurements for H+, O+, and He+. The energy content of the ring current is estimated and binned spatially forLand magnetic local time. The results are combined with an independently derived substorm event list to perform a statistical analysis of variations in the ring current energy content with substorm phase. We show that the ring current energy is significantly higher in the expansion phase compared to the growth phase, with the energy enhancement persisting into the substorm recovery phase. The characteristics of the energy enhancement suggest the injection of energized ions from the tail plasma sheet following substorm onset. The local time variations indicate a loss of energetic H+ions in the afternoon sector, likely due to wave‐particle interactions. Overall, we find that the average energy input into the ring current is ∼9% of the previously reported energy released during substorms.