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DOI | 10.1029/2020GL087406 |
Control of the East-West Component of the Interplanetary Magnetic Field on the Occurrence of Magnetic Substorms | |
Lion, Kan; Sotirelis, Thomas; Mitchell, Elizabeth | |
2020-03-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:5 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | We study the effects of the east-west (y) component of the interplanetary magnetic field (IMF) on the occurrence of substorms by analyzing 16,743 magnetic substorm events identified with the SuperMAG SML index from 1995 to 2016. It is found, surprisingly, that substorm occurrence rates depend highly on the sign of IMF B-y, with, on average, similar to 1/3 more substorms for IMF B-y > 0 than for IMF B-y < 0. We attribute this asymmetry to the enhanced convection (e.g., more energy in the tail) under IMF B-y > 0 conditions. A superposed epoch analysis of the IMF indicates that the average IMF B-y prior to onset is positive but becomes less positive similar to 15 min prior to the onset, indicating that the release of the stress associated with a clockwise twisted magnetotail may be an important onset trigger. We conjecture that an asymmetry in the dayside merging efficiency may be the cause. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000529112700039 |
WOS关键词 | CONVECTION ; MAGNETOPAUSE |
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/279775 |
专题 | 气候变化 |
作者单位 | Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA |
推荐引用方式 GB/T 7714 | Lion, Kan,Sotirelis, Thomas,Mitchell, Elizabeth. Control of the East-West Component of the Interplanetary Magnetic Field on the Occurrence of Magnetic Substorms[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(5). |
APA | Lion, Kan,Sotirelis, Thomas,&Mitchell, Elizabeth.(2020).Control of the East-West Component of the Interplanetary Magnetic Field on the Occurrence of Magnetic Substorms.GEOPHYSICAL RESEARCH LETTERS,47(5). |
MLA | Lion, Kan,et al."Control of the East-West Component of the Interplanetary Magnetic Field on the Occurrence of Magnetic Substorms".GEOPHYSICAL RESEARCH LETTERS 47.5(2020). |
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