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Radiation belt electron scattering by whistler-mode chorus in the Jovian magnetosphere: Importance of ambient and wave parameters

查看全文 作　　者：BinBin [1,2]Ni;Jing [1]Huang;YaSong [3]Ge;Jun [4]Cui;Yong [3]Wei;XuDong [1]Gu;Song [1]Fu;Zheng [1]Xiang;ZhengYu [1]Zhao 高影响力作者 机构地区：[1]Department of Space Physics, School of Electronic Information, Wuhan University;[2]Lunar and Planetary Science Laboratory, Macao University of Science and Technology-Partner Laboratory of Key Laboratory of Lunar and Deep Space Exploration, Chinese Academy of Sciences;[3]Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences;[4]School of Atmospheric Sciences, Sun Yat-Sen University高影响力机构 出　　处：《Earth and Planetary Physics》索引2018年第2卷第1期,共14页高影响力期刊 基　　金：supported by the NSFC grants (41674163) and (41474141);by Lunar and Planetary Science Laboratory, Macao University of Science and Technology-Partner Laboratory of Key Laboratory of Lunar and Deep Space Exploration, Chinese Academy of Sciences (FDCT No. 039/2013/A2);by the Hubei Province Natural Science Excellent Youth Foundation (2016CFA044) 摘　　要：Whistler-mode chorus waves are regarded as an important acceleration mechanism contributing to the formation of relativistic and ultra-relativistic electrons in the Jovian radiation belts. Quantitative determination of the chorus wave driven electron scattering effect in the Jovian magnetosphere requires detailed information of both ambient magnetic field and plasma density and wave spectral property, which however cannot be always readily acquired from observations of existed missions to Jupiter. We therefore perform a comprehensive analysis of the sensitivity of chorus induced electron scattering rates to ambient magnetospheric and wave parameters in the Jovian radiation belts to elaborate to which extent the diffusion coefficients depend on a number of key input parameters. It is found that quasi-linear electron scattering rates by chorus can be strongly affected by the ambient magnetic field intensity, the wave latitudinal coverage, and the peak frequency and bandwidth of the wave spectral distribution in the Jovian magnetosphere, while they only rely slightly on the background plasma density profile and the peak wave normal angle, especially when the wave emissions are confined at lower latitudes. Given the chorus wave amplitude, chorus induced electron scattering rates strongly depend on Jovian L-shell to exhibit a tendency approximately proportional to L_J^3. Our comprehensive analysis explicitly demonstrates the importance of reliable information of both the ambient magnetospheric state and wave distribution property to understanding the dynamic electron evolution in the Jovian radiation belts and therefore has implications for future mission planning to explore the extreme particle radiation environment of Jupiter and its satellites. 关 键 词：Jovian radiation BELTS whistler-mode CHORUS resonant wave-particle interactions magnetospheric state
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