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DOI | 10.1002/2017GL076028 |
Hot Plasma Effects on the Cyclotron-Resonant Pitch-Angle Scattering Rates of Radiation Belt Electrons Due to EMIC Waves | |
Ni, Binbin1; Cao, Xing1; Shprits, Yuri Y.2,3,4; Summers, Danny5; Gu, Xudong1; Fu, Song1; Lou, Yuequn1 | |
2018-01-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:1页码:21-30 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; Germany; USA; Canada |
英文摘要 | To investigate the hot plasma effects on the cyclotron-resonant interactions between electromagnetic ion cyclotron (EMIC) waves and radiation belt electrons in a realistic magnetospheric environment, calculations of the wave-induced bounce-averaged pitch angle diffusion coefficients are performed using both the cold and hot plasma dispersion relations. The results demonstrate that the hot plasma effects have a pronounced influence on the electron pitch angle scattering rates due to all three EMIC emission bands (H+, He+, and O+) when the hot plasma dispersion relation deviates significantly from the cold plasma approximation. For a given wave spectrum, the modification of the dispersion relation by hot anisotropic protons can strongly increase the minimum resonant energy for electrons interacting with O+ band EMIC waves, while the minimum resonant energies for H+ and He+ bands are not greatly affected. For H+ band EMIC waves, inclusion of hot protons tends to weaken the pitch angle scattering efficiency of >5MeV electrons. The most crucial differences introduced by the hot plasma effects occur for >3MeV electron scattering rates by He+ band EMIC waves. Mainly due to the changes of resonant frequency and wave group velocity when the hot protons are included, the difference in scattering rates can be up to an order of magnitude, showing a strong dependence on both electron energy and equatorial pitch angle. Our study confirms the importance of including hot plasma effects in modeling the scattering of ultra-relativistic radiation belt electrons by EMIC waves. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423431800003 |
WOS关键词 | RELATIVISTIC ELECTRONS ; PRECIPITATION ; INSTABILITY ; IONS ; HE+ ; O+ |
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/28196 |
专题 | 气候变化 |
作者单位 | 1.Wuhan Univ, Sch Elect Informat, Dept Space Phys, Wuhan, Hubei, Peoples R China; 2.GFZ German Res Ctr Geosci, Helmholtz Ctr Potsdam, Potsdam, Germany; 3.Univ Potsdam, Inst Phys & Astron, Potsdam, Germany; 4.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA; 5.Mem Univ Newfoundland, Dept Math & Stat, St John, NF, Canada |
推荐引用方式 GB/T 7714 | Ni, Binbin,Cao, Xing,Shprits, Yuri Y.,et al. Hot Plasma Effects on the Cyclotron-Resonant Pitch-Angle Scattering Rates of Radiation Belt Electrons Due to EMIC Waves[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(1):21-30. |
APA | Ni, Binbin.,Cao, Xing.,Shprits, Yuri Y..,Summers, Danny.,Gu, Xudong.,...&Lou, Yuequn.(2018).Hot Plasma Effects on the Cyclotron-Resonant Pitch-Angle Scattering Rates of Radiation Belt Electrons Due to EMIC Waves.GEOPHYSICAL RESEARCH LETTERS,45(1),21-30. |
MLA | Ni, Binbin,et al."Hot Plasma Effects on the Cyclotron-Resonant Pitch-Angle Scattering Rates of Radiation Belt Electrons Due to EMIC Waves".GEOPHYSICAL RESEARCH LETTERS 45.1(2018):21-30. |
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