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Energy transfer during intense geomagnetic storms driven by interplanetary coronal mass ejections and their sheath regions
Guo, Jianpeng; Feng, Xueshang; Emery, Barbara A.; Zhang, Jie; Xiang, Changqing; Shen, Fang; Song, Wenbin; Guo, JP (reprint author), Chinese Acad Sci, State Key Lab Space Weather, CSSAR, SIGMA Weather Grp, Beijing 100190, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2011
Volume116Pages:A05106
ISSN2169-9380
Language英语
AbstractThe interaction of the solar wind and Earth's magnetosphere is complex, and the phenomenology of the interaction is very different for interplanetary coronal mass ejections (ICMEs) compared to their sheath regions. In this paper, a total of 71 intense (Dst <= -100 nT) geomagnetic storm events in 1996-2006, of which 51 are driven by ICMEs and 20 by sheath regions, are examined to demonstrate similarities and differences in the energy transfer. Using superposed epoch analysis, the evolution of solar wind energy input and dissipation is investigated. The solar wind-magnetosphere coupling functions and geomagnetic indices show a more gradual increase and recovery during the ICME-driven storms than they do during the sheath-driven storms. However, the sheath-driven storms have larger peak values. In general, solar wind energy input (the epsilon parameter) and dissipation show similar trends as the coupling functions. The trends of ion precipitation and the ratio of ion precipitation to the total (ion and electron) are quite different for both classes of events. There are more precipitating ions during the peak of sheath-driven storms. However, a quantitative assessment of the relative importance of the different energy dissipation branches shows that the means of input energy and auroral precipitation are significantly different for both classes of events, whereas Joule heating, ring current, and total output energy display no distinguishable differences. The means of electron precipitation are significantly different for both classes of events. However, ion precipitation exhibits no distinguishable differences. The energy efficiency bears no distinguishable difference between these two classes of events. Ionospheric processes account for the vast majority of the energy, with the ring current only being 12%-14% of the total. Moreover, the energy partitioning for both classes of events is similar.; The interaction of the solar wind and Earth's magnetosphere is complex, and the phenomenology of the interaction is very different for interplanetary coronal mass ejections (ICMEs) compared to their sheath regions. In this paper, a total of 71 intense (Dst <= -100 nT) geomagnetic storm events in 1996-2006, of which 51 are driven by ICMEs and 20 by sheath regions, are examined to demonstrate similarities and differences in the energy transfer. Using superposed epoch analysis, the evolution of solar wind energy input and dissipation is investigated. The solar wind-magnetosphere coupling functions and geomagnetic indices show a more gradual increase and recovery during the ICME-driven storms than they do during the sheath-driven storms. However, the sheath-driven storms have larger peak values. In general, solar wind energy input (the epsilon parameter) and dissipation show similar trends as the coupling functions. The trends of ion precipitation and the ratio of ion precipitation to the total (ion and electron) are quite different for both classes of events. There are more precipitating ions during the peak of sheath-driven storms. However, a quantitative assessment of the relative importance of the different energy dissipation branches shows that the means of input energy and auroral precipitation are significantly different for both classes of events, whereas Joule heating, ring current, and total output energy display no distinguishable differences. The means of electron precipitation are significantly different for both classes of events. However, ion precipitation exhibits no distinguishable differences. The energy efficiency bears no distinguishable difference between these two classes of events. Ionospheric processes account for the vast majority of the energy, with the ring current only being 12%-14% of the total. Moreover, the energy partitioning for both classes of events is similar.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3273
Collection空间科学部
Corresponding AuthorGuo, JP (reprint author), Chinese Acad Sci, State Key Lab Space Weather, CSSAR, SIGMA Weather Grp, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Guo, Jianpeng,Feng, Xueshang,Emery, Barbara A.,et al. Energy transfer during intense geomagnetic storms driven by interplanetary coronal mass ejections and their sheath regions[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2011,116:A05106.
APA Guo, Jianpeng.,Feng, Xueshang.,Emery, Barbara A..,Zhang, Jie.,Xiang, Changqing.,...&Guo, JP .(2011).Energy transfer during intense geomagnetic storms driven by interplanetary coronal mass ejections and their sheath regions.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,116,A05106.
MLA Guo, Jianpeng,et al."Energy transfer during intense geomagnetic storms driven by interplanetary coronal mass ejections and their sheath regions".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 116(2011):A05106.
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