Investigation of the peculiarities of artificial electromagnetic signal propagation at high latitudes in the range 0.1–10 Hz

Tereshchenko, E. D.; Ivanov, N. V.; Sidorenko, A. E.; Grigor’ev, V. F.

doi:10.1134/s0016793210050105

Cited by 5 publications

(6 citation statements)

References 4 publications

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“…Obviously, it is possible to record the resonant structure in the spectra of components with large and slowly varying frequency scales at the reception point. This was done by the authors of the paper [10], which presents the results of observing an oscillating structure with large frequency scales (3-4 Hz) in an experiment with a controlled source at high latitudes.…”

Section: Numerical Simulation Results and Discussionmentioning

confidence: 99%

“…The possibility of recording artificial ULF signals from ETLs at distances of about 1000-1400 km has been confirmed by numerous experiments [5][6][7][8][9][10]. In almost all the experiments, the impact of the ionosphere on the spectra of the magnetic-field components of an artificial signal was noted even when it was recorded at distances closer to the source [8,9].…”

Section: Introductionmentioning

confidence: 83%

“…In [12], based on the solution of a two-dimensional telegraph equation, a model of a spherical waveguide for a source such as a horizontal magnetic dipole was developed and calculations for a vertically non-uniform ionosphere were performed, which made it possible to allow for the ionospheric Alfvén resonator (IAR) effects. The method of a two-dimensional telegraph equation was also employed in [10] to calculate the propagation of an artificial signal from ETLs at high latitudes. Herein, the authors did not allow for the interaction of ordinary and extraordinary waves in the ionospheric plasma.…”

Section: Introductionmentioning

confidence: 99%

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Features of the Spectra of Ultra-Low-Frequency Magnetic Fields from Horizontal Current Sources: Models of Planar and Spherical Earth–Ionosphere Waveguides

Ermakova

Ryabov

Kotik

2021

Radiophys Quantum El

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We simulate the magnetic field components in the frequency range 0.1-30 Hz from a source such as the horizontal magnetic dipole located in the Earth-ionosphere cavity. Models of uniform spherical and planar waveguides are considered, the advantages of each model are determined, and a comparative analysis of the simulation results is performed. The results of numerical calculations lead to the conclusion about the impact of the IAR (ionospheric Alfvén resonator) and sub-IAR (resonator at altitudes of 80-300 km) on the amplitude spectra of the ultra-low-frequency (ULF) signal. It is also shown that the appearance of strong sporadic layers (with a plasma frequency exceeding 5 MHz at their maxima) along the entire propagation path of ULF fields from the source to the receiver can strongly change the amplitude spectra of artificial signals. A significant increase in the amplitude of the magnetic field at the IAR harmonic frequencies can be observed at night. The sub-IAR effect is responsible for the appearance of a dependence of the amplitude of the magnetic components, which increases with frequency. Phase shifts between the horizontal components of the ULF signal and the spectra of the polarization parameter are also analyzed. It is shown that ionospheric resonators have almost no effect on the phase characteristics of artificial signals in a uniform waveguide approximation, in contrast to the polarization of magnetic ULF fields from a vertical electric dipole. The dependences of the amplitude of the magnetic field of a signal on the distance r to the source and on the direction to the source are also analyzed. It is shown that the dependence of the decay of the magnetic field amplitude with distance can differ significantly from the 1/r 2 law. The radiation pattern is almost isotropic for k 0 r < 1, where k 0 is the wave number in free space. The lines of equal amplitude are stretched along the direction of the current source for k 0 r ≥ 1.

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Section: Numerical Simulation Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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Features of the Spectra of Ultra-Low-Frequency Magnetic Fields from Horizontal Current Sources: Models of Planar and Spherical Earth–Ionosphere Waveguides

Ermakova

Ryabov

Kotik

2021

Radiophys Quantum El

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“…In this paper, calculations were performed for a vertically inhomogeneous ionosphere, which made it possible to take into account the influence of the ionospheric Alfvén resonator (IAR). The two-dimensional telegraph equation method was also used by Tereshchenko et al (2010) to calculate the propagation of an artificial signal from power lines at high latitudes. However, the interaction between ordinary and extraordinary waves in the ionospheric plasma was not taken into account by the authors of that work.…”

Section: Plain Language Summarymentioning

confidence: 99%

“…An example of a ground source is an installation at Kola Peninsula in which high‐voltage power transmission line was used as antenna (Belyaev et al., 2002). Low frequency signals from the Kola emitter were observed at fairly long distances (Ermakova et al., 2006; Tereshchenko et al., 2010). Interpretation of the Earth electromagnetic sounding data by such a source requires taking into account the influence of the ionosphere in order to increase the reliability of the results (Tereshchenko et al., 2007; Zhamaletdinov et al., 1999).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of ULF Magnetic Fields in the 3D Inhomogeneous Earth‐Ionosphere Waveguide

2022

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We develop an algorithm for calculating the characteristics of the magnetic field of signals in the frequency range of (0.1–20) Hz in the horizontally and vertically inhomogeneous spherical Earth‐ionosphere waveguide. This algorithm involves calculations of the surface impedance of an inhomogeneous ionosphere. The frequency dependences of the amplitude, phase and polarization of the magnetic field generated by a horizontal magnetic dipole were analyzed. It is shown that the horizontal inhomogeneity of the Earth‐ionosphere waveguide can significantly affect the frequency dependence of the amplitude and polarization of the magnetic field, increasing the degree of circular polarization. The horizontal inhomogeneity only slightly influences the results in daytime conditions. The most noticeable difference in the amplitude dependences of the magnetic components and large phase shifts (up to 40°) are observed when the terminator passes through the geodetic line connecting the source and receiver, and in the presence of sporadic layers with a horizontally inhomogeneous structure along the low‐frequency wave propagation path. We compare the calculation results with the magnetic pulsations recorded at Nurmijarvi station during the 2001 campaigns of Kola Peninsula ultra low frequency emitter operation. The obtained results make it possible to qualitatively explain peculiarities of the amplitude and polarization spectra of the artificial magnetic signals recorded in this campaigns that are not explained within the framework of the flat homogeneous waveguide model.

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Features of resonance structures in natural electromagnetic noise spectra in the region of the main ionospheric trough

et al. 2017

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Investigation of the peculiarities of artificial electromagnetic signal propagation at high latitudes in the range 0.1–10 Hz

Cited by 5 publications

References 4 publications

Features of the Spectra of Ultra-Low-Frequency Magnetic Fields from Horizontal Current Sources: Models of Planar and Spherical Earth–Ionosphere Waveguides

Features of the Spectra of Ultra-Low-Frequency Magnetic Fields from Horizontal Current Sources: Models of Planar and Spherical Earth–Ionosphere Waveguides

Characteristics of ULF Magnetic Fields in the 3D Inhomogeneous Earth‐Ionosphere Waveguide

Features of resonance structures in natural electromagnetic noise spectra in the region of the main ionospheric trough

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