Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2018GL077109 |
Excitation of O+ Band EMIC Waves Through H+ Ring Velocity Distributions: Van Allen Probe Observations | |
Yu, Xiongdong1; Yuan, Zhigang1; Huang, Shiyong1; Yao, Fei1; Wang, Dedong2; Funsten, Herbert O.3; Wygant, John R.4 | |
2018-02-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:3页码:1271-1276 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; Germany; USA |
英文摘要 | A typical case of electromagnetic ion cyclotron (EMIC) emissions with both He+ band and O+ band waves was observed by Van Allen Probe A on 14 July 2014. These emissions occurred in the morning sector on the equator inside the plasmasphere, in which region O+ band EMIC waves prefer to appear. Through property analysis of these emissions, it is found that the He+ band EMIC waves are linearly polarized and propagating quasi-parallelly along the background magnetic field, while the O+ band ones are of linear and left-hand polarization and propagating obliquely with respect to the background magnetic field. Using the in situ observations of plasma environment and particle data, excitation of these O+ band EMIC waves has been investigated with the linear growth theory. The calculated linear growth rate shows that these O+ band EMIC waves can be locally excited by ring current protons with ring velocity distributions. The comparison of the observed wave spectral intensity and the calculated growth rate suggests that the density of H+ rings providing the free energy for the instability has decreased after the wave grows. Therefore, this paper provides a direct observational evidence to the excitation mechanism of O+ band EMIC waves: ring current protons with ring distributions provide the free energy supporting the instability in the presence of rich O+ in the plasmasphere. |
英文关键词 | O+ band EMIC waves ring distributions linear wave growth |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000426161800009 |
WOS关键词 | INNER MAGNETOSPHERE ; PLASMASPHERIC PLUME ; LOW-FREQUENCY ; HE+ IONS ; PROPAGATION ; INSTABILITIES |
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/27764 |
专题 | 气候变化 |
作者单位 | 1.Wuhan Univ, Sch Elect Informat, Wuhan, Hubei, Peoples R China; 2.GFZ German Res Ctr Geosci, Potsdam, Germany; 3.Los Alamos Natl Lab, Los Alamos, NM USA; 4.Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA |
推荐引用方式 GB/T 7714 | Yu, Xiongdong,Yuan, Zhigang,Huang, Shiyong,et al. Excitation of O+ Band EMIC Waves Through H+ Ring Velocity Distributions: Van Allen Probe Observations[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(3):1271-1276. |
APA | Yu, Xiongdong.,Yuan, Zhigang.,Huang, Shiyong.,Yao, Fei.,Wang, Dedong.,...&Wygant, John R..(2018).Excitation of O+ Band EMIC Waves Through H+ Ring Velocity Distributions: Van Allen Probe Observations.GEOPHYSICAL RESEARCH LETTERS,45(3),1271-1276. |
MLA | Yu, Xiongdong,et al."Excitation of O+ Band EMIC Waves Through H+ Ring Velocity Distributions: Van Allen Probe Observations".GEOPHYSICAL RESEARCH LETTERS 45.3(2018):1271-1276. |
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