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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Theoretical and numerical analysis of radiation belt electron precipitation by coherent whistler mode waves
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Theoretical and numerical analysis of radiation belt electron precipitation by coherent whistler mode waves

机译：理论和数值分析的辐射带电子降水通过连贯的惠斯勒模式波

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The interaction between coherent whistler mode waves and energetic radiation belt electrons can result in pitch angle scattering of electrons into the bounce loss cone and subsequent precipitation. In studying the effects of VLF transmitter signals on particle precipitation, past modeling efforts have focused on the computation of diffusion coefficients for a Fokker-Planck model. In contrast, to capture the nonlinear effects of large-amplitude coherent waves, we evaluate particle precipitation using a Vlasov-Liouville (VL) model which computes the phase space particle distribution function directly using a characteristic-based solution of the Vlasov equation. Previous work has shown that in the case of large-amplitude coherent waves, phase trapping can significantly perturb resonant particles from their adiabatic paths. We evaluate the importance of phase trapping over a range of wave amplitudes (up to 200 pT); the percentage of particles that precipitate after being phase trapped is computed over a phase space grid in the loss cone. The results demonstrate that phase trapping contributes significantly to precipitation when a large-amplitude wave (>100 pT) is present. Additionally, linear theory can be valid over a broad range of amplitudes and the relative accuracy of linear theory in calculating the precipitated flux depends strongly on the initial particle distribution. Additionally, we demonstrate the ability of the VL model to calculate the time evolution of the precipitated flux due to short-duration whistler mode pulses. The physical parameters used in this study are typical of those associated with the Siple Station wave injection experiment.
机译：连贯的惠斯勒之间的交互模式海浪和高能辐射带电子导致螺旋角散射的电子到损失锥和随后的反弹降水。发射机信号粒子沉淀,过去的建模工作集中在计算的扩散系数福克尔普朗克模型。大幅度相干非线性的影响波,我们评估粒子沉淀使用Vlasov-Liouville(六世)模型计算相空间粒子分布函数直接使用一个基于特性的解决方案弗拉索夫方程。大幅度的相干波,捕获阶段可以极大地扰乱共振粒子的绝热路径。捕获在一系列阶段的重要性波振幅(200 pT);粒子沉淀后阶段被困在相空间网格计算损失锥。捕获大大有助于降水时大幅度波(> 100pT)。是有效的在一个广泛的振幅和线性理论计算的相对精度很大程度上取决于通量的沉淀最初的粒度分布。展示重要的模型的能力计算沉淀的时间演化由于短期惠斯勒模式脉冲通量。在这项研究中使用的物理参数典型的那些与冰期相关联车站波注入实验。

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