Full‐wave modeling of transionospheric propagation of VLF waves
Full‐wave modeling of transionospheric propagation of VLF waves
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DOI：
10.1029/2008gl036535
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发表时间：
2009-02
影响因子：
5.2
通讯作者：
N. Lehtinen;U. Inan
中科院分区：
文献类型：
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作者：
N. Lehtinen;U. Inan
N. G. Lehtinen和u.s.n an（2008）的全波方法（FWM）用于模拟VLF电磁波从地面发射机到卫星高度的跨电离层传播。与卫星观测的直接比较表明，在卫星高度测得的甚高频波强度大大小于预测。振幅的明显减小归因于电离层中不规则的存在，这是波在穿越较低电离层时遇到的。不规则性的线性模式散射将哨声波转换成准静电哨声模式（QEWM）波，在共振锥附近具有波法向角。对FWM的最新改进也进行了描述，这使得在进行傅里叶反变换时遇到的混叠误差最小化。
The full‐wave method (FWM) of N. G. Lehtinen and U. S. Inan (2008) is used to model trans‐ionospheric propagation of VLF electromagnetic waves from ground‐based transmitters up to satellite altitudes. Direct comparison with satellite observations indicates that the VLF wave intensities measured at satellite altitudes are substantially smaller than predicted. The apparent reduction in amplitude is attributed to the presence of irregularities in the ionosphere, which the waves encounter during their traversal of the lower ionosphere. Linear mode scattering from the irregularities convert the whistler waves into quasi‐electrostatic whistler mode (QEWM) waves with wave normal angles near the resonance cone. Recent enhancements to the FWM are also described, which allow the minimization of an aliasing error encountered in taking the inverse Fourier transform.