哨声模合声波对辐射带电子扩散系数的多维建模及损失时间尺度建模研究

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中文摘要：哨声模合声波是地球内磁层中一种典型的等离子体电磁波动,对辐射带电子动态演化起着至关重要的作用.合声波可以与外辐射带电子发生相互作用,将电子散射至损失锥进而沉降至大气;此外合声波也能将几十keV的电子加速到几MeV,是辐射带相对论电子的重要来源.因此,快速准确地计算合声波对辐射带电子的扩散系数,对于优化地球辐射带动理学建模并深入理解电子通量的演化机制具有重要作用.本研究利用Full Diffusion Code(FDC)定量计算了典型合声波波模对辐射带电子的弹跳平均投掷角、能量和交叉扩散系数,并建立了地球内磁层空间中L为2～7、背景环境参数α*为1～13,投掷角αeq为0°～90°、能量Ek为10 eV～10 MeV的电子散射系数矩阵数据库.在此基础上通过线性插值方法可以快速得到不同L和α*参数条件下的合声波对辐射带电子的扩散系数,并计算相对误差验证应用线性插值方法的合理性和准确性.基于扩散系数矩阵数据库,本研究还计算了合声波散射辐射带电子的损失时间尺度,建立了以L、α*和Ek为输入参数的电子损失时间尺度经验模型,从而可以快速获取合声波散射电子的损失时间尺度.结果表明,扩散系数矩阵数据库构建和线性插值方法的使用大幅度减少了获取不同L和α*对应的扩散系数所需时间,同时建立的三维损失时间尺度经验模型可快速得到不同L、α*和Ek所对应合声波散射辐射带电子的损失时间尺度,这些结果提高了地球辐射带动理学建模效率,对于空间天气预报具有重要意义.

外文标题：Multi-dimensional modeling of the diffusionrates of radiation belt electrons by whistle-mode chorus waves and simulations of resultant radiation belt electron loss timescales

外文摘要：Whistler-mode chorus waves are typical electromagnetic plasma wave mode in the Earth's inner magnetosphere,which play vital roles in the radiation belt dynamics.Chorus waves can scatter electrons toward the loss cone and then precipitate them into the atmosphere.Considered as an important source of relativistic electrons,they can also accelerate electrons from tens of keV to a few MeV.Therefore,efficient estimating the diffusion rates induced by chorus waves is important for optimizing the kinetic modeling and understanding the dynamic evolution of radiation belt electrons.In this study,we use Full Diffusion Code(FDC)to calculate the bounce-averaged pitch angle,energy,and cross diffusion rates for typical chorus wave models for electrons in the radiation belt,then establish a diffusion rates matrix for the Earth's inner magnetosphere L 2～7,the background environmental parameter α* 1～13,the pitch angle αeq 0°～90°,and the energies Ek 10 eV～10 MeV.On this basis,we further use linear interpolation method to quickly obtain the diffusion rates of radiation belt electrons scattered by the chorus waves under different L and α*,and verify the rationality and accuracy of the linear interpolation method by calculating the relative errors.Additionally,we investigate the loss timescales of radiation belt electron induced by chorus waves according to the diffusion rate matrix database,and establish an empirical model of the electron loss timescales with L,α*,and Ek as the input parameters.The electron loss timescales caused by the chorus waves can be quickly obtained from this model.Our results show that the computing time of the diffusion rates is significantly reduced by the construction of the diffusion rate matrix database with the usage of linear interpolation,and the empirical three-dimensional model can efficiently provide the wave-driven loss timescales on the radiation belt electrons.Briefly,these results can improve the efficiency of modeling the dynamics of the Earth's radiation belts and have great significance in the space weather forecasting.

外文关键词：

Wave-particle interactionsChorus wavesRadiation belt electronsDiffusion ratesLoss timescales

作者：

张琼月、马新、郭德宇、付松、倪彬彬

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作者单位：

武汉大学电子信息学院空间物理系,武汉 430072

关键词：

波粒相互作用合声波辐射带电子扩散系数损失时间尺度

基金：

国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家重点研发计划中国科学院先导B计划中央高校基本科研业务费专项中央高校基本科研业务费专项中国博士后科学基金

项目编号：

42188101422041604197418642174188420254042022YFF0503700XDB410000002042023kf10252042022kf00162022M722447

出版年：

2024

DOI：

10.6038/cjg2023R0548

地球物理学报

中国地球物理学会中国科学院地质与地球物理研究所

地球物理学报

CSTPCD北大核心

影响因子：3.703

ISSN：0001-5733

年,卷(期)：2024.67(5)

参考文献量6