DOI: 10.1002/2014GL060928
论文题名: External versus internal triggering of substorms: An information-theoretical approach
作者: Johnson J.R. ; Wing S.
刊名: Geophysical Research Letters
ISSN: 0094-9836
EISSN: 1944-9567
出版年: 2014
卷: 41, 期: 16 起始页码: 5748
结束页码: 5754
语种: 英语
Scopus关键词: Information theory
; Magnetic fields
; Entropy-based
; Interplanetary magnetic fields
; Northward IMF
; Substorm model
; Substorm onset
; Surrogate data
; Sustained loading
; Theoretical approach
; Loading
; energy flux
; magnetic field
; planetary atmosphere
; trigger mechanism
英文摘要: The role of external triggering of substorms through northward turning of the interplanetary magnetic field has been examined in a number of recent studies. While Hsu and McPherron (2002, 2004) argue that the strong association between external triggers defined by Lyons et al. (1997) and substorm onsets could be responsible for most substorms, Morley and Freeman (2007) argue that the association between northward interplanetary magnetic field (IMF) turnings and substorm onsets are coincidental rather than causal, because the same external triggers are also closely associated with an artificial list of substorm onsets generated with the Minimal Substorm Model, which has no requirement of northward IMF turning. We examine an expanded list of substorms using conditional redundancy, an entropy-based measure of conditional dependency, to examine whether northward IMF turning as an external trigger provides any additional information about substorm onset beyond knowing that there has been a period of sustained loading of energy flux (southward IMF). Our analysis reveals that only a few percent additional information is provided by the northward turning criterion, which is consistent with the statistics of surrogate data sets of external triggers constructed to coincide with 2% of substorms. We therefore conclude that northward turning of the IMF is, in general, coincidentally, rather than causally, associated with substorm onsets. © 2014. American Geophysical Union. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84906531768&doi=10.1002%2f2014GL060928&partnerID=40&md5=9cc9b5ed0a8f0e94de882abe7631cd3a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7100
Appears in Collections: 气候减缓与适应
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作者单位: Plasma Physics Laboratory, Princeton University, Princeton, NJ, United States
Recommended Citation:
Johnson J.R.,Wing S.. External versus internal triggering of substorms: An information-theoretical approach[J]. Geophysical Research Letters,2014-01-01,41(16).