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Influence of Layering of the Lithosphere on Excitation of Extremely Low-Frequency Electromagnetic Waves by a Horizontal Dipole
Journal of Communications Technology and Electronics ( IF 0.5 ) Pub Date : 2021-04-30 , DOI: 10.1134/s1064226921040148
E. D. Tereshchenko , P. E. Tereshchenko

Abstract—An analytical solution is obtained for the problem of excitation of electromagnetic waves by a horizontal dipole located at the interface between vacuum and a conducting two-layer medium, based on the smallness of the wavelength in a conducting medium compared to vacuum. Numerical calculations have been carried out, which made it possible to evaluate the effectiveness of this approach and show that the approximate formulas describe the behavior of the field with high accuracy. An asymptotic representation is obtained for the magnetic field at the interface between a flat-layered Earth and the atmosphere, which has the form of a wave in a homogeneous half-space with an excitation coefficient depending on the effective conductivity of the lower half-space, which is useful for determining the electrical conductivity of the lithosphere based on experimental data recording the electromagnetic field of an active source. A high sensitivity of the vertical component of the magnetic field to the conductivity of the medium in comparison with the horizontal is noted.



中文翻译:

岩石圈分层对水平偶极子激发极低频电磁波的影响

摘要-基于与真空相比,导电介质中波长的较小性,针对位于真空与导电两层介质之间的界面处的水平偶极子激发电磁波的问题,获得了一种解析解决方案。已经进行了数值计算,这使得评估这种方法的有效性成为可能,并且表明近似公式可以高精度地描述该领域的行为。在平面地球和大气之间的界面处获得了磁场的渐近表示,该磁场在均匀的半空间中具有波的形式,其激励系数取决于下半空间的有效电导率,根据记录有源源电磁场的实验数据,这对于确定岩石圈的电导率很有用。与水平相比,磁场的垂直分量对介质的电导率具有很高的灵敏度。

更新日期:2021-04-30
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