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arXiv 1412.2008physics.space-phphysics.plasm-ph
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辐射带中的共振和非共振哨声-粒子相互作用

Resonant and non-resonant whistlers-particle interaction in the radiation belts

Enrico Camporeale

摘要:

本文研究了低带合唱哨声与各向异性相对论电子之间的波粒相互作用。在这种情况下,我们提出了第一个直接比较的第一原理粒子在细胞(PIC)模拟与准线性扩散代码。在PIC方法中,波是由温度各向异性不稳定性自洽产生的,该温度各向异性不稳定性快速饱和并使系统向边缘稳定性松弛。我们表明,准线性扩散和PIC结果有显着的定量不匹配的区域的能量/俯仰角的共振条件不满足。此外,对于接近损失锥的俯仰角,扩散代码高估了散射,特别是在低能量下。这表明,为了捕获非共振相互作用、共振增宽以及考虑接近$90^\circ$的角度处的散射,应当考虑高阶非线性理论。

英文摘要:

We study the wave-particle interactions between lower band chorus whistlers and an anisotropic tenuous population of relativistic electrons. We present the first direct comparison of first-principle Particle-in-Cell (PIC) simulations with a quasi-linear diffusion code, in this context. In the PIC approach, the waves are self-consistently generated by a temperature anisotropy instability that quickly saturates and relaxes the system towards marginal stability. We show that the quasi-linear diffusion and PIC results have significant quantitative mismatch in regions of energy/pitch angle where the resonance condition is not satisfied. Moreover, for pitch angles close to the loss cone the diffusion code overestimates the scattering, particularly at low energies. This suggest that higher order nonlinear theories should be taken in consideration in order to capture non-resonant interactions, resonance broadening, and to account for scattering at angles close to $90^\circ$.

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