Latitudinal dependence of ground VLF transmitter wave power in the inner magnetosphere
Latitudinal dependence of ground VLF transmitter wave power in the inner magnetosphere
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DOI：
10.3389/fspas.2023.1135509
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发表时间：
2023-02
期刊：
影响因子：
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通讯作者：
Z. Xia;Lunjin Chen;W. Gu;R. Horne;Y. Miyoshi;Y. Kasahara;A. Kumamoto;F. Tsuchiya;Satoko Nakamura-Sat
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文献类型：
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作者：
Z. Xia;Lunjin Chen;W. Gu;R. Horne;Y. Miyoshi;Y. Kasahara;A. Kumamoto;F. Tsuchiya;Satoko Nakamura-Sat
本文利用ERG/Arase卫星近3年的观测资料，统计研究了甚低频（VLF）地面发射器在磁层内的波功率的纬向分布，并分析了相应的纬向依赖性。结果表明，NWC发射信号的平均强度随发射信号从南纬（10 - 30 °）向内磁层赤道传播而减小，随发射信号再向北方纬（10 - 30 °）传播而增大。从货车艾伦探测器在较窄纬度范围（北纬-20 °到0°）的观测中也可以发现类似的纬度依赖性。射线跟踪模拟的发射机发射传播进行，并再现了类似的观察的双曲波功率分布。对于NAA、NLK和NLM发射器也可以发现类似的纬度依赖性。
In this study, we use approximately 3 years of observations from the Exploration of energization and Radiation in Geospace (ERG/Arase) satellite to statistically study the meridional distribution of wave power from very-low-frequency (VLF) ground transmitters in the inner magnetosphere and analyze the corresponding latitudinal dependence. The results show that the mean intensity of NWC transmitter signals decreases as the transmitter emission propagates from the southern latitude (∼—30°) region to the equator in the inner magnetosphere and then increases as the emission propagates to the northern latitude ( ∼ 30 ° ) region again. Similar latitudinal dependence can be found from the Van Allen Probes’ observation with a narrower latitude range (∼−20° to 0°). A ray-tracing simulation of the transmitter emission propagation is performed and reproduces a meridional wave power distribution similar to the observation. Similar latitudinal dependence can also be found for NAA, NLK and NLM transmitters.