Long-Term Variations of Energetic Electrons Scattered by Signals From the North West Cape Transmitter

IF 3.7 2区 地球科学 Space Weather Pub Date : 2024-03-03 DOI:10.1029/2023sw003827
Jingle Hu, Zheng Xiang, Xin Ma, Yangxizi Liu, Junhu Dong, Deyu Guo, Binbin Ni
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Abstract

Very-low-frequency (VLF) signals emitted from ground-based transmitters for submarine communication can penetrate the ionosphere and leak into the magnetosphere, leading to electron precipitation via wave-particle interaction and thereby providing a potential means for radiation belt remediation. In this study, we systematically analyze the dependence of quasi-trapped electron fluxes scattered by signals from the North West Cape (NWC) transmitter on electron energy, L-shell, and geomagnetic activity (i.e., the Dst index) using long-term measurements from the DEMETER satellite. Considering potentially changed theoretical cyclotron resonant condition, we find that the variations of wave normal angle (WNA) of NWC transmitter signals or of the background electron density can explain the variated “wisp” positions in energy versus L plane. The long-term data analyzation suggests that the energy-dependences increases can help to distinguish the different source mechanisms of quasi-trapped electrons. The enhancement of quasi-trapped electron fluxes induced by NWC transmitter signals is more obvious at L = 1.8 than L = 1.6 due to higher trapped flux levels and strong pitch angle diffusion induced by transmitter signals.
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西北角发射机信号散射的高能电子的长期变化
用于海底通信的地面发射机发射的甚低频(VLF)信号可以穿透电离层并泄漏到磁层中,通过波粒相互作用导致电子沉淀,从而为辐射带修复提供一种潜在的手段。在这项研究中,我们利用 DEMETER 卫星的长期测量数据,系统分析了西北角(NWC)发射机信号散射的准俘获电子通量与电子能量、L 壳和地磁活动(即 Dst 指数)的关系。考虑到理论上回旋共振条件的潜在变化,我们发现 NWC 发射机信号的波法线角(WNA)或背景电子密度的变化可以解释能量与 L 平面上 "缕 "的位置变化。长期数据分析表明,能量依赖性的增加有助于区分准俘获电子的不同来源机制。在 L = 1.8 时,NWC 发射信号诱导的准俘获电子通量的增强比 L = 1.6 时更为明显,这是因为发射信号诱导了更高的俘获通量水平和更强的俯仰角扩散。
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