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| DOI | 10.1029/2019GL086790 |
| A New Theory for Energetic Electron Generation Behind Dipolarization Front | |
| Fu H.S.; Zhao M.J.; Yu Y.; Wang Z. | |
| 发表日期 | 2020 |
| ISSN | 0094-8276 |
| 卷号 | 47期号:6 |
| 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 RE. Our theory can explain both the presence and absence of energetic electrons behind DFs. ©2020. American Geophysical Union. All Rights Reserved. |
| 英文关键词 | Electron scattering; Electrons; Magnetic mirrors; Magnetism; Dipolarization; Electron acceleration; Energetic electron; Magnetosonic waves; New theory; Bottles; atmospheric electricity; electron; measurement method |
| 语种 | 英语 |
| 来源期刊 | Geophysical Research Letters
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/170570 |
| 作者单位 | School of Space and Environment, Beihang University, Beijing, 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],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). |
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