极低频无线电波在球形地球-电离层波导中传播的时域有限差分分析及其基于解析解的验证

IF 1.7 4区地球科学 Q3 ASTRONOMY & ASTROPHYSICS

Annales Geophysicae Pub Date : 2022-06-15 DOI:10.5194/angeo-40-395-2022

V. Marchenko, A. Kulak, J. Mlynarczyk

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引用次数: 3

摘要

摘要在轴对称系统的假设下，建立了地球-电离层空腔中电磁波传播的时域有限差分(FDTD)模型，求解了二维球面坐标系下的简化麦克斯韦方程组。在地球子午线上不同位置的电场和磁场分量的不同电导率剖面上验证了该模型。计算了特征电磁高度、相速度和衰减率。将数值计算结果与解析计算结果进行了比较，发现两者吻合较好。所进行的时域有限差分建模使我们能够分析舒曼共振和在距离接收器不同距离处发生的单个闪电放电的传播。开发的模型在分析ELF测量时特别有用。

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Finite-difference time-domain analysis of ELF radio wave propagation in the spherical Earth–ionosphere waveguide and its validation based on analytical solutions

Abstract. The finite-difference time-domain (FDTD) model of electromagnetic wave propagation in the Earth–ionosphere cavity was developed under assumption of an axisymmetric system, solving the reduced Maxwell equations in a 2D spherical coordinate system. The model was validated on different conductivity profiles for the electric and magnetic field components for various locations on Earth along the meridian. The characteristic electric and magnetic altitudes, phase velocity, and attenuation rate were calculated. We compared the results of numerical and analytical calculations and found good agreement between them. The undertaken FDTD modeling enables us to analyze the Schumann resonances and the propagation of individual lightning discharges occurring at various distances from the receiver. The developed model is particularly useful when analyzing ELF measurements.

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来源期刊

Annales Geophysicae 地学-地球科学综合

CiteScore

4.30

自引率

0.00%

发文量

审稿时长

2 months

期刊介绍： Annales Geophysicae (ANGEO) is a not-for-profit international multi- and inter-disciplinary scientific open-access journal in the field of solar–terrestrial and planetary sciences. ANGEO publishes original articles and short communications (letters) on research of the Sun–Earth system, including the science of space weather, solar–terrestrial plasma physics, the Earth''s ionosphere and atmosphere, the magnetosphere, and the study of planets and planetary systems, the interaction between the different spheres of a planet, and the interaction across the planetary system. Topics range from space weathering, planetary magnetic field, and planetary interior and surface dynamics to the formation and evolution of planetary systems.