Relativistic electron scattering by magnetosonic waves: Effects of discrete wave emission and high wave amplitudes
Relativistic electron scattering by magnetosonic waves: Effects of discrete wave emission and high wave amplitudes
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DOI：
10.1063/1.4922061
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发表时间：
2015-06
影响因子：
2.2
通讯作者：
A. Artemyev;D. Mourenas;O. Agapitov;V. Krasnoselskikh
中科院分区：
文献类型：
--
作者：
A. Artemyev;D. Mourenas;O. Agapitov;V. Krasnoselskikh
在本文中，我们研究快磁声波的相对论电子散射。我们比较了不同波谱的测试粒子模拟结果和准线性理论，以研究波发射的精细结构如何影响电子共振散射。我们表明，对于波法线角 θ 的实际宽分布（即，当色散 δθ≥0.5° 时），相对论电子散射对于宽波谱和由分离良好的离子回旋加速器谐波组成的谱是相似的。测试粒子模拟与准线性理论的比较表明，对于 δθ>0.5°，准线性近似可以正确描述足够大的等离子体频率下的共振散射。然而，对于非常窄的θ分布（当δθ∼0.05°时），波谱中的精细结构的影响变得很重要。在这种情况下，准线性理论显然无法准确描述快速磁声波的电子散射。我们还研究了效果...
In this paper, we study relativistic electron scattering by fast magnetosonic waves. We compare results of test particle simulations and the quasi-linear theory for different spectra of waves to investigate how a fine structure of the wave emission can influence electron resonant scattering. We show that for a realistically wide distribution of wave normal angles θ (i.e., when the dispersion δθ≥0.5°), relativistic electron scattering is similar for a wide wave spectrum and for a spectrum consisting in well-separated ion cyclotron harmonics. Comparisons of test particle simulations with quasi-linear theory show that for δθ>0.5°, the quasi-linear approximation describes resonant scattering correctly for a large enough plasma frequency. For a very narrow θ distribution (when δθ∼0.05°), however, the effect of a fine structure in the wave spectrum becomes important. In this case, quasi-linear theory clearly fails in describing accurately electron scattering by fast magnetosonic waves. We also study the effect ...