The evolution of geomagnetotail magnetic flux in isolated substorms

	The evolution of geomagnetotail magnetic flux in isolated substorms
	Yang, Y.Y.; Shen, C.; Rong, Z.J.; Dunlop, M.; Shen, X.H.; Huang, J.P.; Chen, Z.Q.; Yang, Y.Y. (youngyany@163.com)
刊名	Journal of Atmospheric and Solar-Terrestrial Physics
	2017
卷号	164 页码:163-171
ISSN号	1364-6826
英文摘要	The magnetic field energy stored in geomagnetotail released during a substorm period, cause significant magnetic disturbance of the space environment. The quantitative relationship between the magnetic field energy and the level of substorm activity, however, is still unclear, although many studies have qualitatively revealed the correlation between them. Here, using data from four selected isolated substorm cases, the evolution of the magnetic flux (MF) in the magnetotail observed by Cluster is quantitatively surveyed. The results from the four cases demonstrate that the evolution of magnetotail MF is closely related to the phases of substorm development. For quiet time, the magnetotail is in the ground state with MF being about 0.6 GWb. During the growth phase, however, as the substorm develop the MF keeps increasing, the substorm onset is triggered when the MF has increased up to some threshold. The comparison between the four cases shows that the accumulation of more magnetic field energy corresponds to more released energy, and consistently, the more intense a substorm can be powered. The study also finds that there is an imbalance between the increased and decreased MF amplitude, indicating that the substorm may not be the only way to release the stored magnetotail energy. © 2017 Elsevier Ltd
语种	英语
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/6026]
专题	国家空间科学中心_空间科学部
通讯作者	Yang, Y.Y. (youngyany@163.com)
推荐引用方式 GB/T 7714	Yang, Y.Y.,Shen, C.,Rong, Z.J.,et al. The evolution of geomagnetotail magnetic flux in isolated substorms[J]. Journal of Atmospheric and Solar-Terrestrial Physics,2017,164:163-171.
APA	Yang, Y.Y..,Shen, C..,Rong, Z.J..,Dunlop, M..,Shen, X.H..,...&Yang, Y.Y. .(2017).The evolution of geomagnetotail magnetic flux in isolated substorms.Journal of Atmospheric and Solar-Terrestrial Physics,164,163-171.
MLA	Yang, Y.Y.,et al."The evolution of geomagnetotail magnetic flux in isolated substorms".Journal of Atmospheric and Solar-Terrestrial Physics 164(2017):163-171.