Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019GL086790 |
A New Theory for Energetic Electron Generation Behind Dipolarization Front | |
Fu, H. S.; Zhao, M. J.; Yu, Y.; Wang, Z. | |
2020-03-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:6 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | A long-standing problem concerning dipolarization front (DF) is why energetic electrons only appear in half the DF events? By analyzing MMS measurements, here we answer this question. We find a DF structure, behind which energetic-electron fluxes are modulated by magnetosonic waves: At wave troughs (B-minimum) electron fluxes are high; at wave crests (B-maximum) electron fluxes are low. This phenomenon challenges the classical theory of betatron mechanism, so we need to propose a new theory to explain it. In our theory, there exists a magnetic bottle with time-varying belly but steady neck behind the DF. When the belly expands, a magnetic bottle is formed, and electrons are trapped; when the belly contracts, the magnetic bottle disappears, and electrons are expelled. Quantitatively, we validate the existence of this bottle and estimate its size as 2-3 R-E. Our theory can explain both the presence and absence of energetic electrons behind DFs. |
英文关键词 | dipolarization front energetic electrons new theory electron acceleration magnetosonic wave magnetic bottle |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000529097700041 |
WOS关键词 | PITCH-ANGLE DISTRIBUTIONS ; BURSTY BULK FLOWS ; PLASMA SHEET ; ACCELERATION ; CLUSTER ; SUBSTORM ; DYNAMICS ; EVENT |
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/279809 |
专题 | 气候变化 |
作者单位 | Beihang Univ, Sch Space & Environm, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Fu, H. S.,Zhao, M. J.,Yu, Y.,et al. A New Theory for Energetic Electron Generation Behind Dipolarization Front[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(6). |
APA | Fu, H. S.,Zhao, M. J.,Yu, Y.,&Wang, Z..(2020).A New Theory for Energetic Electron Generation Behind Dipolarization Front.GEOPHYSICAL RESEARCH LETTERS,47(6). |
MLA | Fu, H. S.,et al."A New Theory for Energetic Electron Generation Behind Dipolarization Front".GEOPHYSICAL RESEARCH LETTERS 47.6(2020). |
条目包含的文件 | 条目无相关文件。 |
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