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DOI | 10.1029/2019GL086384 |
Episodic Occurrence of Field-Aligned Energetic Ions on the Dayside | |
Yue, Chao1,2; Bortnik, Jacob2; Zou, Shasha3; Nishimura, Yukitoshi4; Foster, John C.5; Coppeans, Thomas3; Ma, Qianli2,4; Zong, Qiugang1; Hull, A. J.6; Henderson, Mike7; Reeves, Geoffrey D.7,8; Spence, Harlan E.9 | |
2020-01-28 | |
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:2 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | The tens of kiloelectron volt ions observed in the ring current region at L similar to 3-7 generally have pancake pitch angle distributions, that is, peaked at 90 degrees. However, in this study, by using the Van Allen Probe observations on the dayside, unexpectedly, we have found that about 5% time, protons with energies of similar to 30 to 50 keV show two distinct populations, having an additional field-aligned population overlapping with the original pancake population. The newly appearing field-aligned populations have higher occurrence rates at similar to 12-16 magnetic local time during geomagnetically active times. In particular, we have studied eight such events in detail and found that the source regions are located around 12 to 18 magnetic local time which coincides with our statistical result. Based on the ionospheric and geosynchronous observations, it is suggested that these energetic ions with field-aligned pitch angle distributions probably are accelerated near postnoon in association with ionospheric disturbances that are triggered by tail injections. |
英文关键词 | field-aligned PADs ring current energetic ions ionospheric disturbance tail injections |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000517154600017 |
WOS关键词 | PITCH-ANGLE DISTRIBUTIONS ; EARTHS RING CURRENT ; ALFVEN WAVES ; ACCELERATION ; PARTICLE ; OUTFLOW ; STORM ; SIMULATIONS ; DENSITIES ; DYNAMICS |
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/279557 |
专题 | 气候变化 |
作者单位 | 1.Peking Univ, Inst Space Phys & Appl Technol, Beijing, Peoples R China; 2.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA; 3.Univ Michigan, Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA; 4.Boston Univ, Ctr Space Phys, Boston, MA 02215 USA; 5.MIT, Haystack Observ, Westford, MA 01886 USA; 6.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA; 7.Los Alamos Natl Lab, Space Sci & Applicat Grp, Los Alamos, NM USA; 8.New Mexico Consortium, Space Sci Div, Los Alamos, NM USA; 9.Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA |
推荐引用方式 GB/T 7714 | Yue, Chao,Bortnik, Jacob,Zou, Shasha,et al. Episodic Occurrence of Field-Aligned Energetic Ions on the Dayside[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(2). |
APA | Yue, Chao.,Bortnik, Jacob.,Zou, Shasha.,Nishimura, Yukitoshi.,Foster, John C..,...&Spence, Harlan E..(2020).Episodic Occurrence of Field-Aligned Energetic Ions on the Dayside.GEOPHYSICAL RESEARCH LETTERS,47(2). |
MLA | Yue, Chao,et al."Episodic Occurrence of Field-Aligned Energetic Ions on the Dayside".GEOPHYSICAL RESEARCH LETTERS 47.2(2020). |
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