By Weiyan Pan, Kai Li (auth.)
This ebook offers with the SLF/ELF wave propagation, a huge department of electromagnetic thought. The SLF/ELF wave propagation thought is easily utilized in earthquake electromagnetic radiation, submarine conversation, thunderstorm detection, and geophysical prospecting and diagnostics. The propagation of SLF/ELF electromagnetic waves is brought in a variety of media just like the earth-ionospheric waveguide, ionospheric plasma, sea water, earth, and the boundary among diverse media or the stratified media. functions within the earthquake electromagnetic radiation and the submarine communications also are addressed. This ebook is meant for scientists and engineers within the fields of radio propagation and EM conception and applications.
Prof. Pan is a professor at China study Institute of Radiowave Propagation in Qingdao (China).
Dr. Li is a professor at Zhejiang college in Hangzhou (China).
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Extra info for Propagation of SLF/ELF Electromagnetic Waves
138), and considering that the sign should be changed for θ derivatives when interchanging the coordinates of the receiver and source, it follows that Erhe (r, θ, φ) = − iI ds he η cos φ 2ha ∞ × Λen Fn (zr ) n=0 ∂Fn (zs ) ∂Pν (cos(π − θ )) . 142) Similarly, with the substitution of Eq. 132) into Eq. 141), it follows that Hrhe (r, θ, φ) = I ds he sin φ 2ha ∞ Λhm Gm (zr )Gm (zs ) m=1 ∂Pμ (cos(π − θ )) . 143) Here Fn (z) and Gm (z) refer to the height-gain function for TMn wave and that for TEm wave, respectively.
Especially in SLF/ELF ranges, the electromagnetic waves in the ionosphere will show significant anisotropic properties. In order to address the effects of the SLF/ELF wave propagation by the geomagnetic field, the computations for the relative phase velocity versus the propagation direction are carried out at f = 75 Hz and shown in Fig. 13. 5 Effect of Attenuation and Phase Velocity by Ionosphere 51 Fig. 12 The attenuation rate in nighttime versus the operating frequency for the TEM mode Fig. 13 The relative phase velocity versus the propagation direction at f = 75 Hz the computations for the attenuation rates versus the propagation direction are also carried out and shown in Fig.
In the case that the observer is located on or near the Earth’s surface, it is acceptable to use a relatively simple model in engineering. • From the computed results, it is seen that the propagation loss of SLF/ELF waves in daytime is larger than that in nighttime. It is resulted by the equivalent reflection height of the ionosphere in nighttime being higher than that in daytime. The attenuation rates of the fundamental mode versus the ground conductivity are computed for the two different modes and shown in Fig.