NWC诱导电子沉淀的研究及理论模拟
Investigation of NWC-induced electron precipitation and theoretical simulation
摘要：
几个研究小组观测并分析了由强大的西北角甚低频发射机引起的内辐射带电子通量的增强。然而，所有以前的出版物都只关注NWC诱导的>100 keV电子，这是基于地震区电磁发射探测（DEMETER）和地球同步业务环境卫星（GOES）的观测结果。在这里，我们提出的通量增强与30- 100 keV的电子有关的NWC发射机的第一次，这是观测到的GOES卫星在夜间。与100- 300 keV沉淀电子发射器类似，低能30- 100 keV沉淀电子主要位于发射器的东部。然而，后者向东漂移的程度不如前者，可能是因为电子速度较低。30- 100 keV电子分布在L=1.8- 2.1壳层范围内，而100- 300 keV电子分布在L=1.67- 1.9壳层范围内。这与甚低频波引起的电子通量增强的能量随着L壳层值的增加而降低的观点是一致的。本文通过与准线性波粒相互作用的回旋共振理论的比较，论证了30- 100和100- 300 keV电子通量同时增强的合理性。此外，我们还利用射线追踪模型解释了北半球和南半球NWC电功率分布的不对称性。最后，我们提出了相当多的讨论，并表明，良好的协议之间存在的观测卫星和理论。
英文摘要：
Enhancement of the electron fluxes in the inner radiation belt, which is induced by the powerful North West Cape (NWC) very-low-frequency (VLF) transmitter, have been observed and analyzed by several research groups. However, all of the previous publications have focused on NWC-induced >100-keV electrons only, based on observations from the Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) and the Geostationary Operational Environmental Satellite (GOES) satellites. Here, we present flux enhancements with 30--100-keV electrons related to NWC transmitter for the first time, which were observed by the GOES satellite at night. Similar to the 100--300-keV precipitated-electron havior, the low energy 30--100-keV electron precipitation is primarily located east of the transmitter. However, the latter does not drift eastward to the same extent as the former, possibly because of the lower electron velocity. The 30--100-keV electrons are distributed in the L=1.8--2.1 shell range, in contrast to the 100--300-keV electrons which are at L=1.67--1.9. This is consistent with the perspective that the energy of the VLF-wave-induced electron flux enhancement decreases with higher L-shell values. We expand upon the rationality of the simultaneous enhancement of the 30--100- and 100--300-keV electron fluxes through comparison with the cyclotron resonance theory for the quasi-linear wave-particle interaction. In addition, we interpret the asymmetry characteristics of NWC electric power distribution in north and south hemisphere by ray tracing model. Finally, we present considerable discussion and show that good agreement exists between the observation of satellites and theory.
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