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题名: Contributions of substorm injections to SYM-H depressions in the main phase of storms
作者: Zhaohai He; Lei Dai; Chi Wang; Suping Duan; Lingqian Zhang; Tao Chen; I. Roth
作者部门: 空间科学部
关键词: substorm ; storm ; substorm injection ; ring current ; Dst index
刊名: Journal of Geophysical Research: Space Physics
出版日期: 2016
英文摘要: Substorm injections bring energetic particles to the inner magnetosphere. But the role of the injected population in building up the storm time ring current is not well understood. By surveying Los Alamos National Laboratory geosynchronous data during 34 storm main phases, we show evidence that at least some substorm injections can contribute to substorm-time scale SYM-H/Dst depressions in the main phase of storms. For event studies, we analyze two typical events in which the main-phase SYM-H index exhibited stepwise depressions that are correlated with particle flux enhancement due to injections and with AL index. A statistical study is performed based on 95 storm time injection events. The flux increases of the injected population (50–400 keV) are found proportional to the sharp SYM-Hdepressions during the injection interval. By identifying dispersionless and dispersive injection signals, we estimate the azimuthal extent of the substorm injection. Statistical results show that the injection regions of these storm time substorms are characterized with an azimuthal extent larger than 06:00 magnetic local time. These results suggest that at least some substorm injections may mimic the large-scale enhanced convection and contribute to sharp decreases of Dst in the storm main phase.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/5642
Appears in Collections:空间科学部_期刊论文

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Recommended Citation:
Zhaohai He,Lei Dai,Chi Wang,et al. Contributions of substorm injections to SYM-H depressions in the main phase of storms[J]. Journal of Geophysical Research: Space Physics,2016.
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