气候变化领域集成服务门户(CCPortal): Network community structure of substorms using SuperMAG magnetometers

CCPortal

DOI	10.1038/s41467-021-22112-4
	Network community structure of substorms using SuperMAG magnetometers
	Orr L.; Chapman S.C.; Gjerloev J.W.; Guo W.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	Geomagnetic substorms are a global magnetospheric reconfiguration, during which energy is abruptly transported to the ionosphere. Central to this are the auroral electrojets, large-scale ionospheric currents that are part of a larger three-dimensional system, the substorm current wedge. Many, often conflicting, magnetospheric reconfiguration scenarios have been proposed to describe the substorm current wedge evolution and structure. SuperMAG is a worldwide collaboration providing easy access to ground based magnetometer data. Here we show application of techniques from network science to analyze data from 137 SuperMAG ground-based magnetometers. We calculate a time-varying directed network and perform community detection on the network, identifying locally dense groups of connections. Analysis of 41 substorms exhibit robust structural change from many small, uncorrelated current systems before substorm onset, to a large spatially-extended coherent system, approximately 10 minutes after onset. We interpret this as strong indication that the auroral electrojet system during substorm expansions is inherently a large-scale phenomenon and is not solely due to many meso-scale wedgelets. © 2021, The Author(s).
语种	英语
scopus关键词	detection method; electrojet; ground-based measurement; magnetometer; three-dimensional modeling
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/251492
作者单位	Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry, United Kingdom; Applied Physics Laboratory—John Hopkins University, Laurel, MD, United States; Birkeland Centre, University of Bergen, Bergen, Norway; School of Aerospace, Cranfield University, Cranfield, United Kingdom; Alan Turing Institute, London, United Kingdom
推荐引用方式 GB/T 7714	Orr L.,Chapman S.C.,Gjerloev J.W.,et al. Network community structure of substorms using SuperMAG magnetometers[J],2021,12(1).
APA	Orr L.,Chapman S.C.,Gjerloev J.W.,&Guo W..(2021).Network community structure of substorms using SuperMAG magnetometers.Nature Communications,12(1).
MLA	Orr L.,et al."Network community structure of substorms using SuperMAG magnetometers".Nature Communications 12.1(2021).