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DOI | 10.1029/2018GL081828 |
Evolution of Radiation Belt Electron Pitch Angle Distribution Due to Combined Scattering by Plasmaspheric Hiss and Magnetosonic Waves | |
Hua, Man1,2; Ni, Binbin1; Li, Wen2; Gu, Xudong1; Fu, Song1; Shi, Run1; Xiang, Zheng1; Cao, Xing1; Zhang, Wenxun1; Guo, Yingjie1 | |
2019-03-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:6页码:3033-3042 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | Both magnetosonic (MS) waves and plasmaspheric hiss can resonantly scatter outer radiation belt electrons, leading to various electron pitch angle distribution. Based on electron diffusion coefficients calculations and 2-D Fokker-Planck diffusion simulations, we perform a parametric study to quantitatively investigate the net electron scattering effect and the relative contributions of simultaneously occurring hiss and MS waves with groups of different wave amplitude combinations. It is found that the combined scattering effects are dominated by pitch angle scattering due to hiss emissions at L = 4, when their amplitude is comparable to or stronger than that of MS waves, thereby producing the butterfly, top-hat, flat-top, and pancake pitch angle distributions, while the butterfly distributions can evolve over a broader energy range when MS waves join the combined scattering effects. Our results demonstrate that the relative intensities of various plasma waves play an essential role in controlling the radiation belt electron dynamics. Plain Language Summary The Earth's outer radiation belt electrons exhibit high dynamics in terms of both pitch angle and energy distributions. Because MS waves and hiss can frequently occur simultaneously inside the plasmasphere, it is important to understand their combined scattering effects on and relative contributions to the radiation belt electron dynamics. Although a number of case studies have been performed to analyze the consequences of combined scattering by these two concurrently occurring plasma waves, there lack parametric and comprehensive investigations to look into the combined scattering effects corresponding to groups of different intensities of the two wave modes. In this letter, by combining the calculations of wave-induced electron diffusion coefficients and 2-D Fokker-Plank diffusion simulations, we quantitatively analyze electron pitch angle and energy distributions under the impacts of 255 different wave amplitude combinations of these two wave modes, which can lead to top-hat, pancake, flat-top, and butterfly PADs. Our results indicate that the relative wave amplitudes of these two waves play an essential role in controlling the dynamic variations of radiation belt electron distribution. |
英文关键词 | resonant wave-particle interactions parametric study plasmaspheric hiss magnetosonic waves combined scattering diffusion simulations |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000464650400003 |
WOS关键词 | RESONANT SCATTERING ; RELATIVISTIC ELECTRONS ; MODEL |
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/181750 |
专题 | 气候变化 |
作者单位 | 1.Wuhan Univ, Dept Space Phys, Sch Elect Informat, Wuhan, Hubei, Peoples R China; 2.Boston Univ, Ctr Space Phys, Boston, MA 02215 USA |
推荐引用方式 GB/T 7714 | Hua, Man,Ni, Binbin,Li, Wen,et al. Evolution of Radiation Belt Electron Pitch Angle Distribution Due to Combined Scattering by Plasmaspheric Hiss and Magnetosonic Waves[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(6):3033-3042. |
APA | Hua, Man.,Ni, Binbin.,Li, Wen.,Gu, Xudong.,Fu, Song.,...&Guo, Yingjie.(2019).Evolution of Radiation Belt Electron Pitch Angle Distribution Due to Combined Scattering by Plasmaspheric Hiss and Magnetosonic Waves.GEOPHYSICAL RESEARCH LETTERS,46(6),3033-3042. |
MLA | Hua, Man,et al."Evolution of Radiation Belt Electron Pitch Angle Distribution Due to Combined Scattering by Plasmaspheric Hiss and Magnetosonic Waves".GEOPHYSICAL RESEARCH LETTERS 46.6(2019):3033-3042. |
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