Propagation characteristics of very low frequency vortex electromagnetic waves in an anisotropic ionosphere

2021 ◽  
Author(s):  
Shitian Zhang ◽  
Xianrui Wang ◽  
Maoyan Wang ◽  
Huaiyun Peng ◽  
Bing Wei ◽  
...  
Keyword(s):  
Electromagnetic Waves ◽  
Low Frequency ◽  
Propagation Characteristics ◽  
Very Low Frequency

scholarly journals Very Low Frequency Propagation Characteristics Analysis in Coal Mines

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 95483-95490
Author(s):  
Hui Zhang ◽  
Mengzhi Zhu ◽  
Xingwang Li ◽  
Weihai Han ◽  
Zhanyang Liu
Keyword(s):  
Coal Mines ◽  
Low Frequency ◽  
Propagation Characteristics ◽  
Very Low Frequency ◽  
Characteristics Analysis

scholarly journals Model of the propagation of very low-frequency beams in the Earth–ionosphere waveguide: principles of the tensor impedance method in multi-layered gyrotropic waveguides

2020 ◽  
Vol 38 (1) ◽  
pp. 207-230
Author(s):  
Yuriy Rapoport ◽  
Vladimir Grimalsky ◽  
Viktor Fedun ◽  
Oleksiy Agapitov ◽  
John Bonnell ◽  
...  
Keyword(s):  
Optical Waveguides ◽  
Electromagnetic Waves ◽  
Low Frequency ◽  
Signal Propagation ◽  
Wide Frequency Range ◽  
Impedance Method ◽  
Very Low Frequency ◽  
The Earth ◽  
Tensor Impedance ◽  
Electromagnetic Beams

Abstract. The modeling of very low-frequency (VLF) electromagnetic (EM) beam propagation in the Earth–ionosphere waveguide (WGEI) is considered. A new tensor impedance method for modeling the propagation of electromagnetic beams in a multi-layered and inhomogeneous waveguide is presented. The waveguide is assumed to possess the gyrotropy and inhomogeneity with a thick cover layer placed above the waveguide. The influence of geomagnetic field inclination and carrier beam frequency on the characteristics of the polarization transformation in the Earth–ionosphere waveguide is determined. The new method for modeling the propagation of electromagnetic beams allows us to study the (i) propagation of the very low-frequency modes in the Earth–ionosphere waveguide and, in perspective, their excitation by the typical Earth–ionosphere waveguide sources, such as radio wave transmitters and lightning discharges, and (ii) leakage of Earth–ionosphere waveguide waves into the upper ionosphere and magnetosphere. The proposed approach can be applied to the variety of problems related to the analysis of the propagation of electromagnetic waves in layered gyrotropic and anisotropic active media in a wide frequency range, e.g., from the Earth–ionosphere waveguide to the optical waveband, for artificial signal propagation such as metamaterial microwave or optical waveguides.

scholarly journals Researches on very low frequency acoustic signal propagation characteristics in different shallow elastic wedge bottoms

2019 ◽  
Vol 283 ◽  
pp. 02003
Author(s):  
Jun Zhu ◽  
Hanhao Zhu ◽  
Jun Tang ◽  
Guangxue Zheng
Keyword(s):  
Acoustic Signal ◽  
Low Frequency ◽  
Signal Propagation ◽  
Acoustic Energy ◽  
Propagation Characteristics ◽  
The Finite Element Method ◽  
Very Low Frequency ◽  
Extremely Low Frequency ◽  
Elastic Bottom ◽  
Sloping Bottom

Targeted at the issue of extremely low-frequency (<100Hz) acoustic propagation in complex shallow elastic bottom environments. The influence law of different complex elastic bottoms on the acoustic signal propagation at very low frequency by acoustic energy flux has been analyzed with the simulation, which is based on the finite element method. The elastic bottoms which have been studied are the shallow horizontal elastic bottom, and the up-sloping and the down-sloping elastic bottom. The results show that the acoustic signal propagating in the up-sloping and down-sloping elastic bottom environments is more complex than that propagating in the horizontal elastic bottom, and the acoustic energy leaking into those elastic bottoms has very different influence on the acoustic signal propagation, especially in the up-sloping bottom.

Experimental investigation of interaction of very low frequency electromagnetic waves with metallic nanostructure

2011 ◽  
Vol 109 (11) ◽  
pp. 114907
Author(s):  
Vijay Nalladega ◽  
Shamachary Sathish ◽  
Terry Murray ◽  
Eunsung Shin ◽  
Kumar V. Jata ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Electromagnetic Waves ◽  
Low Frequency ◽  
Metallic Nanostructure ◽  
Very Low Frequency

scholarly journals An Observation of Very Low Frequency (VLF) Electromagnetic Waves Generated by Lightning Strikes via RockSat-X

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Breonna McMahon ◽  
Ariane Boissonnas ◽  
Nathaniel Lee ◽  
Max Becher ◽  
Thomas Shannon ◽  
...  
Keyword(s):  
Electromagnetic Waves ◽  
Low Frequency ◽  
Lightning Strikes ◽  
Very Low Frequency

Generation of electromagnetic waves in the very low frequency band by velocity gradient

2014 ◽  
Vol 21 (1) ◽  
pp. 012107 ◽  
Author(s):  
G. Ganguli ◽  
E. Tejero ◽  
C. Crabtree ◽  
W. Amatucci ◽  
L. Rudakov
Keyword(s):  
Frequency Band ◽  
Velocity Gradient ◽  
Electromagnetic Waves ◽  
Low Frequency ◽  
Very Low Frequency
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