辐射带电子和磁声波的弹跳共振
发布时间：2018-10-24 19:05
【摘要】：波粒相互作用在辐射带高能电子动态变化中扮演着重要作用。以前的研究主要关注回旋共振和漂移共振,本课题研究磁声波与电子的弹跳共振。我们推导了电子和磁声波弹跳共振的理论扩散系数,并用测试粒子模拟的方法验证了这套扩散系数。这套扩散系数也适用于波谱在频率和传播角均有分布的波模。使用以往发表的磁声波模型,我们分析了波动模型参数变化对弹跳共振扩散系数的影响,并对其做了理论解释。通过计算磁声波和电子弹跳共振的扩散系数,以及弹跳共振下电子的通量变化,我们证明了磁声波可以通过弹跳共振造成高能电子的加速和投掷角散射,而且这种机制也能够有效散射投掷角90°附近的电子。我们得出电子和磁声波的弹跳共振可以在辐射带高能电子动态变化中起重要作用。
[Abstract]:The wave-particle interaction plays an important role in the dynamic changes of high energy electrons in the radiation zone. Previous studies focused on cyclotron resonance and drift resonance. The theoretical diffusion coefficients of electron and magnetoacoustic bouncing resonance are derived, and the diffusion coefficients are verified by the method of particle simulation. This set of diffusion coefficients is also applicable to wave modes where the spectrum is distributed at both the frequency and the propagation angle. Using the previously published magnetoacoustic model, we analyze the effect of the variation of wave model parameters on the bouncing resonance diffusion coefficient and give a theoretical explanation. By calculating the diffusion coefficients of magnetoacoustic and electron bouncing resonance and the flux variation of electrons under bouncing resonance, we prove that magnetoacoustic waves can cause acceleration and angular scattering of high-energy electrons by bouncing resonance. Moreover, this mechanism can also effectively scatter electrons near the angle of 90 掳. We conclude that the bouncing resonance of electrons and magnetoacoustic waves can play an important role in the dynamic changes of high energy electrons in the radiation band.
【学位授予单位】：中国科学技术大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P353
本文编号：2292279
[Abstract]:The wave-particle interaction plays an important role in the dynamic changes of high energy electrons in the radiation zone. Previous studies focused on cyclotron resonance and drift resonance. The theoretical diffusion coefficients of electron and magnetoacoustic bouncing resonance are derived, and the diffusion coefficients are verified by the method of particle simulation. This set of diffusion coefficients is also applicable to wave modes where the spectrum is distributed at both the frequency and the propagation angle. Using the previously published magnetoacoustic model, we analyze the effect of the variation of wave model parameters on the bouncing resonance diffusion coefficient and give a theoretical explanation. By calculating the diffusion coefficients of magnetoacoustic and electron bouncing resonance and the flux variation of electrons under bouncing resonance, we prove that magnetoacoustic waves can cause acceleration and angular scattering of high-energy electrons by bouncing resonance. Moreover, this mechanism can also effectively scatter electrons near the angle of 90 掳. We conclude that the bouncing resonance of electrons and magnetoacoustic waves can play an important role in the dynamic changes of high energy electrons in the radiation band.
【学位授予单位】：中国科学技术大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P353
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