带状合唱中间隙形成机制的非线性亚回旋共振
Nonlinear sub-cyclotron resonance as a formation mechanism for gaps in banded chorus
摘要：
磁层合唱的一个有趣特征是在$ω\simeq 0.5Ω_e$处存在频率间隙，其中$Ω_e$是电子回旋角频率。最近的合唱观测有时会在$0.3Ω_e$和$0.6Ω_e$附近显示出额外的间隙。在这里，我们提出了一种新的非线性机制，这些差距的形成使用哈密顿理论和测试粒子模拟在一个均匀的，磁化的，无碰撞等离子体。我们发现，一个倾斜的哨声波的频率在一个分数的电子回旋频率可以与电子共振，导致有效的能量交换之间的波和粒子。
英文摘要：
An interesting characteristic of magnetospheric chorus is the presence of a frequency gap at $ω\simeq 0.5Ω_e$, where $Ω_e$ is the electron cyclotron angular frequency. Recent chorus observations sometimes show additional gaps near $0.3Ω_e$ and $0.6Ω_e$. Here we present a novel nonlinear mechanism for the formation of these gaps using Hamiltonian theory and test-particle simulations in a homogeneous, magnetized, collisionless plasma. We find that an oblique whistler wave with frequency at a fraction of the electron cyclotron frequency can resonate with electrons, leading to effective energy exchange between the wave and particles.
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