| Influence of Initial Proton Energy on the Nonlinear Interactions Between Ring Current Protons and He+ Band EMIC Waves | |
Zhou, Su1,2; Cai YZ(蔡永志)3,4,5
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| 发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
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| 2024-10 | |
| 卷号 | 129期号:10 |
| DOI | 10.1029/2024JA032954 |
| 产权排序 | 第3完成单位 |
| 收录类别 | SCI |
| 摘要 | The energy of ring current protons is believed to influence the pitch angle scattering due to electromagnetic ion cyclotron (EMIC) waves and is typically analyzed using quasi-linear theory. However, nonlinear behavior becomes significant as the wave amplitude intensifies. In this study, we aim to explore how the nonlinear behavior depends on the initial proton energy under various background plasma density conditions. The frequency of EMIC waves is 0.96 Omega(He) (where Omega(He) is the gyrofrequency of He+ at the equator). It is found that the higher energy protons with nonlinear phase trapping experience more resonances, causing these trapped protons to move away from the loss cone more quickly compared to lower energy protons. However, the proportion of phase-trapped protons significantly decreases as the initial proton energy increases. This declining trend is more pronounced for a background plasma condition in the plasmapause than within the plasmasphere. The number of phase-trapped protons goes to zero as initial proton energy increases to above approximately 60 keV. Additionally, nonlinear phase bunching is more pronounced for lower energy protons (e.g., below 60 keV) compared to higher energy protons. As a result, both nonlinear phase trapping and phase bunching contribute to larger standard deviations in the net changes of equatorial pitch angle (Delta alpha(eq)), suggesting a larger pitch agnel diffusion coefficient compared to the prediction of quasi-linear theory. |
| 资助项目 | National Natural Science Foundation of China; Guizhou Science and Technology Plan from Guizhou Provincial Department of Science and Technology; Scientific Research Funds of Guiyang University; High Level Innovation Talents Project of Guizhou Province; Yunnan Fundamental Research Projects[202401AU070063]; International Centre of Supernovae, Yunnan Key Laboratory |
| 项目资助者 | National Natural Science Foundation of China ; Guizhou Science and Technology Plan from Guizhou Provincial Department of Science and Technology[QKHJC-ZK[2022]YB015] ; Scientific Research Funds of Guiyang University[GYU-KY-[2024]] ; High Level Innovation Talents Project of Guizhou Province[ZKHT-GCC[2023]003] ; Yunnan Fundamental Research Projects[202401AU070063] ; International Centre of Supernovae, Yunnan Key Laboratory[202302AN360001] ; [42164009] ; [12303054] |
| 语种 | 英语 |
| 学科领域 | 天文学 ; 物理学 |
| 文章类型 | Article |
| 出版者 | AMER GEOPHYSICAL UNION |
| 出版地 | 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA |
| ISSN | 2169-9380 |
| URL | 查看原文 |
| WOS记录号 | WOS:001334469800001 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | COHERENT VLF WAVES ; GEOMAGNETIC STORMS ; HEAVY-IONS ; ANGLE ; ELECTRONS ; SCATTERING ; DIFFUSION |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 版本 | 出版稿 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/27640 |
| 专题 | 南方基地 中国科学院天体结构与演化重点实验室 |
| 作者单位 | 1.School of Science, Guiyang University, Guiyang, China; 2.Contribution: Conceptualization, Methodology, Software, Investigation, Data curation, Writing - original draft, Funding acquisition; 3.Yunnan Observatories, Chinese Academy of Sciences, Kunming, China; 4.International Centre of Supernovae, Yunnan Key Laboratory, Kunming, China; 5.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, China |
| 推荐引用方式 GB/T 7714 | Zhou, Su,Cai YZ. Influence of Initial Proton Energy on the Nonlinear Interactions Between Ring Current Protons and He+ Band EMIC Waves[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2024,129(10). |
| APA | Zhou, Su,&蔡永志.(2024).Influence of Initial Proton Energy on the Nonlinear Interactions Between Ring Current Protons and He+ Band EMIC Waves.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,129(10). |
| MLA | Zhou, Su,et al."Influence of Initial Proton Energy on the Nonlinear Interactions Between Ring Current Protons and He+ Band EMIC Waves".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 129.10(2024). |
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