Stepwise feature of aurora during substorm expansion compared with the near-Earth tail dipolarization: Possible types of substorm dynamics

NCU Institutional Repository > 地球科學學院 > 太空科學研究所 > 期刊論文 > Item 987654321/50410

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/50410

题名:	Stepwise feature of aurora during substorm expansion compared with the near-Earth tail dipolarization: Possible types of substorm dynamics
作者:	Saito,MH;Miyashita,Y;Fujimoto,M;Liou,K;Saito,Y;Sigwarth,JB
贡献者:	太空科學研究所
日期:	2010
上传时间:	2012-03-27 17:31:06 (UTC+8)
出版者:	國立中央大學
摘要:	Previous studies of auroral behaviors have suggested that the substorm expansion is a result of a chain of processes originating in the magnetotail. We present a detailed study on the substorm expansion behavior on 3 November 1998, using the global auroral images from Polar and the conjugate central plasma sheet data from Geotail in the near-Earth tail. The closer inspection of the auroral data enables us to characterize the stepwise feature of the auroral evolution, which were found to be spatially and temporally separable into two intense auroral activities: the initial brightening of the substorm arc and the second aurora that took place eastward of the first one with the time delay of 4.5 min. Comparing the near-Earth tail observation of the fast plasma flow, we show that the observed time lag of 4.5 min can be explained by a systematic chain of plasma processes in the central plasma sheet, indicating that this time delay can be interpreted as a generic behavior. The generality of the stepwise evolution within the expected time lag of 2-6 min is also pursued, and is found for three out of six substorms. With respect to the stepwise feature, our observation of six substorms suggests that there are at least three types of substorm expansion dynamics that are attributable to different chains of tail processes.
關聯:	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
显示于类别:	[太空科學研究所 ] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	476	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....