考虑电离层离子的ELF/SLF电磁波传播特性数值模拟研究

doi:10.12196/j.issn.1000-3274.2022.04.009

Abstract

Abstract: Based on the electromagnetic equation considering the ionosphere ions, the modeling of the propagation characteristic from the atmosphere into the ionosphere for the ELF (3~30 Hz)/SLF (30~300 Hz)/ULF (300~3 000 Hz)/VLF (3 kHz~30 kHz) electromagnetic wave is implemented in this paper, focusing on the influence of the ions on the propagation process. The results show that the ions could be ignored for ULF/VLF electromagnetic waves penetrating from the atmosphere into the ionosphere, but have a great impact on the ELF/SLF waves. The ELF/SLF electromagnetic waves are mostly restricted to lithosphere-ionosphere waveguide. It's easier for the TM (Traverse Magnetic) wave to penetrate into the ionosphere than the TE (Traverse Electric) wave. The electromagnetic wave is more likely to be transformed into the ordinary wave after penetrating the sharp boundary, which will decay rapidly in the ionosphere. The presence of ionosphere ions will weaken the reflection and transmission of the electromagnetic wave at the same time, hindering the penetration into the ionosphere, and may accelerate the attenuation of the extraordinary wave. The greater the density of ions in the ionosphere are, the severer the absorption of electromagnetic waves is, while the rapid movement of ions helps the electromagnetic wave penetrating the ionosphere. The work provides a fundamental basis for the ground-based artificial experiment and the further study of seismo-ionosphere coupling mechanism.

Key words: Ionosphere ion, ELF/SLF electromagnetic wave, Sharp boundary of the low ionosphere, Reflection coefficient, Transmission coefficient, Refractive index

CLC Number:

P315.7

WANG Ya-lu, ZHANG Xue-min, ZEREN Zhi-ma, WANG Xiao. The Modeling of the Propagation Characteristics for ELF/SLF Electromagnetic Wave Considering the Ionosphere Ions[J]. EARTHQUAKE, 2022, 42(4): 111-126.

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The Modeling of the Propagation Characteristics for ELF/SLF Electromagnetic Wave Considering the Ionosphere Ions

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