GSTDTAP  > 气候变化
DOI10.1029/2019GL082824
Directed Network of Substorms Using SuperMAG Ground-Based Magnetometer Data
Orr, L.1; Chapman, S. C.1; Gjerloev, J. W.2,3
2019-06-28
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2019
卷号46期号:12页码:6268-6278
文章类型Article
语种英语
国家England; USA; Norway
英文摘要

We quantify the spatiotemporal evolution of the substorm ionospheric current system utilizing the SuperMAG 100+ magnetometers. We construct dynamical directed networks from this data for the first time. If the canonical cross-correlation between vector magnetic field perturbations observed at two magnetometer stations exceeds a threshold, they form a network connection. The time lag at which canonical cross-correlation is maximal determines the direction of propagation or expansion of the structure captured by the network connection. If spatial correlation reflects ionospheric current patterns, network properties can test different models for the evolving substorm current system. We select 86 isolated substorms based on nightside ground station coverage. We find, and obtain the timings for, a consistent picture in which the classic substorm current wedge forms. A current system is seen premidnight following the substorm current wedge westward expansion. Later, there is a weaker signal of eastward expansion. Finally, there is evidence of substorm-enhanced convection.


英文关键词substorms networks correlation ground magnetometers SuperMAG
领域气候变化
收录类别SCI-E
WOS记录号WOS:000477616300013
WOS关键词MAGNETOSPHERIC SUBSTORMS ; SOLAR-WIND ; IONOSPHERE ; SYSTEM ; MODEL
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/184212
专题气候变化
作者单位1.Univ Warwick, Ctr Fus Space & Astrophys, Coventry, W Midlands, England;
2.Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA;
3.Univ Bergen, Birkeland Ctr, Bergen, Norway
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Orr, L.,Chapman, S. C.,Gjerloev, J. W.. Directed Network of Substorms Using SuperMAG Ground-Based Magnetometer Data[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(12):6268-6278.
APA Orr, L.,Chapman, S. C.,&Gjerloev, J. W..(2019).Directed Network of Substorms Using SuperMAG Ground-Based Magnetometer Data.GEOPHYSICAL RESEARCH LETTERS,46(12),6268-6278.
MLA Orr, L.,et al."Directed Network of Substorms Using SuperMAG Ground-Based Magnetometer Data".GEOPHYSICAL RESEARCH LETTERS 46.12(2019):6268-6278.
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