Acceleration of charged particles by large amplitude MHD waves: Effect of wave spatial correlation
Acceleration of charged particles by large amplitude MHD waves: Effect of wave spatial correlation
复制标题
大振幅 MHD 波对带电粒子的加速：波空间相关性的影响
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
T. Hada
中科院分区：
文献类型：
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作者：
Y. Kuramitsu;T. Hada
我们讨论了能量扩散和加速带电粒子的大振幅磁流体动力学（MHD）波的测试粒子模拟，特别注意波的相位相关的影响。在准线性理论中，波的相位被假定为随机的，但实际上，不同波模式之间的相互作用可能产生相位相关。当波相强相关时，波形表现为空间局域化的行波包。这些波包可以有效地加速带电粒子，因为它们被反向传播的波包反复镜像反射：这一过程类似于费米加速。
We discuss energy diffusion and acceleration of charged particles by large amplitude magnetohydrodynamic (MHD) waves by test particle simulations, paying particular attention to the effects of phase correlation of the waves. In quasi‐linear theory, the wave phases are assumed to be random, but in reality, interaction between different wave modes may produce phase correlation. When the wave phases are strongly correlated, the waveform appears as spatially localized traveling wave packet. These wave packets can efficiently accelerate charged particles, as they are repeatedly mirror reflected by oppositely propagating wave packets: a process analogous to the Fermi acceleration.