NSSC OpenIR  > 空间科学部
Alternative TitleStudy on the Earth ring current during magnetic storms based on energetic neutral atom flux data
陈志青; 沈超; 路立; McKenna-Lawlor S; 刘振兴; 燕广庆; zhiqing@nssc.ac.en
Source Publication地球物理学报
Keyword环电流 中性原子成像 磁暴 亚暴 离子
Other AbstractBy analyzing the energetic neutral atom (ENA) flux data during two major magnetic storms, this study tries to reveal the characteristics of flux variation of the ring current ions. Furthermore, the formation and loss mechanism of the ring current, and the storm-sub storm relationship were discussed. During the magnetic storms, ENA flux variation shows some important features: (1) The ENA spectrum shows a rapid decrease as energy increases, and became harder during main phase of the storms. (2) ENA flux fluctuated in a dispersionless mode. (3) There's no straight or clear relation between ENA flux fluctuation and AE index. (4) Before the storms entered recovery phase, or at the end of main phase, ENA flux increased heavily for a short time. (5) During the rapid recovery phase of Dst/SYM-H index, ENA flux variation took a two stage recovery mode, first rapid then slow. Ignoring other factors that have less effect on ENA flux, the features of ENA variation can give some implications on ring current dynamics. The spectrum of ring current ions should have a steep minus slope and get harder during main phase of storms possibly due to dramatic increasing of O~+ flux. Ions are injected from the magnetotail to the ring current region in a dispersionless mode mostly by enhanced convective electric field. There's no straight cause and effect relation between sub-storm activities and enhancement of the ring current, although sub-storms may cause short term variations of ion flux. Before recovery phase, ion flux increases rapidly at the dusk side of the Earth. This can be interpreted as a result of piling up of ions due to diminishing of convective electric field on formation of shielding electric field and subsequent weakening of the escaping loss process at the magnetopause. The Dst/SYM-H index can't accurately indicate intensity of the ring current and the recovery of the ring current may be more complicated than the rapid and slow mode that Dst/ SYM-H takes.
Indexed BySCI ; CSCD
Funding Project中国科学院空间科学与应用研究中心
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Document Type期刊论文
Corresponding Authorzhiqing@nssc.ac.en
Recommended Citation
GB/T 7714
陈志青,沈超,路立,等. 基于中性原子通量数据的磁暴期间环电流研究[J]. 地球物理学报,2012,55(3):727-737.
APA 陈志青.,沈超.,路立.,McKenna-Lawlor S.,刘振兴.,...&zhiqing@nssc.ac.en.(2012).基于中性原子通量数据的磁暴期间环电流研究.地球物理学报,55(3),727-737.
MLA 陈志青,et al."基于中性原子通量数据的磁暴期间环电流研究".地球物理学报 55.3(2012):727-737.
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