DOI: 10.1002/2017JA024451
Scopus记录号: 2-s2.0-85040867463
论文题名: Substorm Occurrence and Intensity Associated With Three Types of Solar Wind Structure
作者: Liou K. ; Sotirelis T. ; Richardson I.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 1 起始页码: 485
结束页码: 496
语种: 英语
英文关键词: coronal mass ejection
; high-speed stream
; slow solar wind
; substorm intensity
; substorm occurrence
英文摘要: This paper presents the results of a study of the characteristics of substorms that occurred during three distinct types of solar wind: coronal mass ejection (CME) associated, high-speed streams (HSS), and slow solar wind (SSW). A total number of 53,468 geomagnetic substorm onsets from 1983 to 2009 is used and sorted by the three solar wind types. It is found that the probability density function (PDF) of the intersubstorm time can be fitted by the combination of a dominant power law with an exponential cutoff component and a minor lognormal component, implying that substorms are associated with two distinctly different dynamical processes corresponding, perhaps, to the “externally driven” and “internally driven” processes, respectively. We compare substorm frequency and intensity associated with the three types of solar wind. It is found that the intersubstorm time is the longest during SSW and shortest during CME intervals. The averaged intersubstorm time for the internally driven substorms is 3.13, 3.15, and 7.96 h for CME, HSS, and SSW, respectively. The substorm intensity PDFs, as represented by the peak value of |SML| (the generalization of AL), can be fitted by two lognormal distribution functions. The averaged substorm intensity for either component is largest for CME (292 and 674 nT) and smallest for SSW (265 and 434 nT). We argue that the externally driven substorms are more intense than those driven internally. We conclude that the dynamical process of substorms is controlled mainly by the direct solar wind-magnetosphere coupling, whereas the internally driven process only plays a very modest minor role. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114792
Appears in Collections: 气候减缓与适应
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作者单位: Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; GPHI/Department Of Astronomy, University of Maryland, College Park, MD, United States
Recommended Citation:
Liou K.,Sotirelis T.,Richardson I.. Substorm Occurrence and Intensity Associated With Three Types of Solar Wind Structure[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)