A New SLF/ELF Algorithm of Fields Excited by a Radiator in a Soil Foundation in the Earth–Ionosphere Cavity
Abnormal electromagnetic radiation associated with seismic activity has been reported across a wide range of frequencies, but its primary energy is concentrated in the super-low-frequency (SLF) and extremely low-frequency (ELF) bands. To estimate the effect of the seismic radiation source, a radiato...
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| Format: | Article |
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MDPI AG
2023-09-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/14/9/1450 |
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| author | Yuanxin Wang Jutao Yang Shuji Hao Jing Chen Yonggan Liang Yanshuai Zheng |
| author_facet | Yuanxin Wang Jutao Yang Shuji Hao Jing Chen Yonggan Liang Yanshuai Zheng |
| author_sort | Yuanxin Wang |
| collection | DOAJ |
| description | Abnormal electromagnetic radiation associated with seismic activity has been reported across a wide range of frequencies, but its primary energy is concentrated in the super-low-frequency (SLF) and extremely low-frequency (ELF) bands. To estimate the effect of the seismic radiation source, a radiator in a soil foundation was modeled as a horizontal electric dipole (HED), and the propagation characteristics of the electromagnetic fields were studied in the Earth–ionosphere cavity. The expressions of the electromagnetic fields could be obtained according to the reciprocity theorem. Therefore, a new algorithm named the numerical integral algorithm was proposed, which is suitable for both the SLF and ELF bands. The new algorithm was compared with the asymptotic approximation algorithm when the receiving point was not close to the field source and the antipode. The two algorithms were found to be in excellent agreement, confirming the validity of the new algorithm for SLF and ELF bands. |
| first_indexed | 2024-03-10T23:03:54Z |
| format | Article |
| id | doaj.art-c829700b4d1a4e7789d517f7d9a20574 |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-10T23:03:54Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-c829700b4d1a4e7789d517f7d9a205742023-11-19T09:31:27ZengMDPI AGAtmosphere2073-44332023-09-01149145010.3390/atmos14091450A New SLF/ELF Algorithm of Fields Excited by a Radiator in a Soil Foundation in the Earth–Ionosphere CavityYuanxin Wang0Jutao Yang1Shuji Hao2Jing Chen3Yonggan Liang4Yanshuai Zheng5National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, ChinaNational Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, ChinaNational Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, ChinaNational Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, ChinaNational Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, ChinaNational Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, ChinaAbnormal electromagnetic radiation associated with seismic activity has been reported across a wide range of frequencies, but its primary energy is concentrated in the super-low-frequency (SLF) and extremely low-frequency (ELF) bands. To estimate the effect of the seismic radiation source, a radiator in a soil foundation was modeled as a horizontal electric dipole (HED), and the propagation characteristics of the electromagnetic fields were studied in the Earth–ionosphere cavity. The expressions of the electromagnetic fields could be obtained according to the reciprocity theorem. Therefore, a new algorithm named the numerical integral algorithm was proposed, which is suitable for both the SLF and ELF bands. The new algorithm was compared with the asymptotic approximation algorithm when the receiving point was not close to the field source and the antipode. The two algorithms were found to be in excellent agreement, confirming the validity of the new algorithm for SLF and ELF bands.https://www.mdpi.com/2073-4433/14/9/1450electromagnetic radiationSLF and ELFEarth–ionosphere cavityreciprocity theoremnumerical integral algorithm |
| spellingShingle | Yuanxin Wang Jutao Yang Shuji Hao Jing Chen Yonggan Liang Yanshuai Zheng A New SLF/ELF Algorithm of Fields Excited by a Radiator in a Soil Foundation in the Earth–Ionosphere Cavity Atmosphere electromagnetic radiation SLF and ELF Earth–ionosphere cavity reciprocity theorem numerical integral algorithm |
| title | A New SLF/ELF Algorithm of Fields Excited by a Radiator in a Soil Foundation in the Earth–Ionosphere Cavity |
| title_full | A New SLF/ELF Algorithm of Fields Excited by a Radiator in a Soil Foundation in the Earth–Ionosphere Cavity |
| title_fullStr | A New SLF/ELF Algorithm of Fields Excited by a Radiator in a Soil Foundation in the Earth–Ionosphere Cavity |
| title_full_unstemmed | A New SLF/ELF Algorithm of Fields Excited by a Radiator in a Soil Foundation in the Earth–Ionosphere Cavity |
| title_short | A New SLF/ELF Algorithm of Fields Excited by a Radiator in a Soil Foundation in the Earth–Ionosphere Cavity |
| title_sort | new slf elf algorithm of fields excited by a radiator in a soil foundation in the earth ionosphere cavity |
| topic | electromagnetic radiation SLF and ELF Earth–ionosphere cavity reciprocity theorem numerical integral algorithm |
| url | https://www.mdpi.com/2073-4433/14/9/1450 |
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