DOI: 10.1002/2017JA024506
Scopus记录号: 2-s2.0-85040053809
论文题名: Validation and Analysis of Bounce Resonance Diffusion Coefficients
作者: Li X. ; Tao X.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 1 起始页码: 104
结束页码: 113
语种: 英语
英文关键词: bounce resonance
; equatorially mirroring electrons
; magnetosonic waves
; sensitivity analysis
; test particle simulation
英文摘要: Theoretical bounce resonance diffusion coefficients for waves generated near the equatorial plane are analyzed theoretically and validated numerically using guiding-center test particle simulations. A previous study demonstrated numerically the sensitivity of the diffusion coefficients to the peak wave normal angle and the maximum wave latitude for electrons in bounce resonance with equatorially confined magnetosonic waves. We demonstrate analytically that the sensitivity of the diffusion coefficients to the peak wave normal angle is due to the narrow width of the wave normal angle distribution of the particular wave model used by the previous study. We also show that there is no dependence on the maximum latitude if particle's mirroring points are located within the wave boundary. By analyzing the contribution of each harmonic resonance to the total diffusion coefficients, we show that the discontinuities of the diffusion coefficients as a function of the equatorial pitch angle (α0) occur when the contribution of a harmonic resonance goes to 0. Using a two-dimensional pitch angle and energy diffusion simulation, we demonstrate that bounce resonance with magnetosonic waves can cause pitch angle scattering of equatorially mirroring electrons, leading to a smooth variation of flux with α0 for α0∼90∘. We conclude that bounce resonance with magnetosonic waves might be an important mechanism in pitch angle scattering and acceleration of electrons in the radiation belt. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114824
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, China; Collaborative Innovation Center of Astronautical Science and Technology, China
Recommended Citation:
Li X.,Tao X.. Validation and Analysis of Bounce Resonance Diffusion Coefficients[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)