浸没在冷磁化等离子体中的天线驱动的ELF和VLF模之间的参数不稳定性研究
Investigation of a parametric instability between ELF and VLF modes driven by antennas immersed in a cold, magnetized plasma
摘要：
我们已经研究了一个VLF，ELF和组合ELF/VLF天线沉浸在冷，磁化等离子体使用一个完全动力学，三维粒子在细胞模拟代码称为大尺度等离子体（LSP）的行为。所有的天线被建模为磁偶极子（$ρ_{ant}=0$），并被分配一个有限大小的电流回路内的时变电流密度。VLF天线以大于较低混合频率（$ω_{LH}$）的频率（$ω_{VLF}$）以10安培驱动，而ELF天线以小于$ω_{LH}$的频率（$ω_{ELF}$）以3安培驱动。组合的ELF/VLF天线（我们称之为参量天线）包括在同一模拟域中同时驱动的两个天线。我们发现，参量天线非线性激发电磁（EM）哨声波在更大程度上比单独的甚低频天线。我们还表明，EM哨声波的参数激发导致更大的发射EM功率（以瓦特计）相比，单独的VLF天线。
英文摘要：
We have studied the behavior of a VLF, ELF and combined ELF/VLF antenna immersed in a cold, magnetized plasma using a fully kinetic, three dimensional Particle-in-Cell simulation code called Large Scale Plasma (LSP). All the antennas are modeled as magnetic dipoles ($ρ_{ant}=0$) and are assigned a time varying current density within a finite sized current loop. The VLF antenna is driven at 10 Amps with a frequency ($ω_{VLF}$) greater than the lower hybrid frequency ($ω_{LH}$), while the ELF antenna is driven at 3 Amps with a frequency ($ω_{ELF}$) less than $ω_{LH}$. The combined ELF/VLF antenna (which we call a parametric antenna) includes both antennas driven simultaneously in the same simulation domain. We show that the parametric antenna non-linearly excites electromagnetic (EM) Whistler waves to a greater extent than the VLF antenna alone. We also show that the parametric excitation of EM Whistler waves leads to greater emitted EM power (measured in Watts) compared with a VLF antenna alone.
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