VLF propagation effects of a D‐region layer produced by cosmic rays
VLF propagation effects of a D‐region layer produced by cosmic rays
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宇宙射线产生的 D 区层的 VLF 传播效应
DOI：
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发表时间：
1960
期刊：
影响因子：
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通讯作者：
W. Moler
中科院分区：
文献类型：
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作者：
W. Moler
仅基于一氧化氮的莱曼α光电离的单层D区模型不足以解释VLF无线电传播的某些方面。经验证据表明，存在第二个和较低的D层，这是非常重要的VLF传播。结果表明，正常的宇宙射线产生足够的电离这样的层。讨论了100公里以下有效的电子产生和耗尽过程以及地磁场引起的宇宙线原色的纬向分布。通过光电离和宇宙线电离过程得到的一系列电子密度分布与由电磁测量得到的双层D区模型进行了比较。计算得到的日出前低层宇宙线感生层反射的VLF信号的相位和振幅特征与实测值符合得很好。
The single-layered D-region model based only on Lyman α photoionization of nitric oxide is inadequate to explain certain aspects of VLF radio propagation. Empirical evidence indicates the existence of a second and lower D layer which is important for VLF propagation. It is shown that normal cosmic rays produce sufficient ionization for such a layer. The electron-production and -depletion processes effective below 100 km and the latitudinal distribution of cosmic-ray primaries due to the geomagnetic field are discussed. A series of electron-density profiles obtained from photoionization and cosmic-ray ionization processes is compared with the two-layered D-region model deduced from electromagnetic measurements. The calculated phase and amplitude characteristics of VLF signals reflected from the lower cosmic-ray-induced layer during the presunrise hour are in good agreement with those measured.