Algorithm for modeling electromagnetic channel of seismo-ionospheric coupling (SIC) and the variations in the electron concentration

Rapoport, Yuriy; Grimalsky, V.; Krankowski, Andrzej; Пулинец, С. А.; Fedorenko, A.K.; Petrishchevskii, Sergei

doi:10.1007/s11600-019-00385-0

Cited by 8 publications

(5 citation statements)

References 56 publications

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“…Now, we will restrict ourselves with the searching the global and resonant atmosphere modes among these determined by the solution of Dispersion Equation (A16), as it is noted in the text of our paper (see Section 3 in particular). This is important due to the global character of the sources (such as global terminator and X-ray flares), with the influence of these on the ionosphere being studied in the present paper; note that the global Lamb modes of the atmosphere are also excited effectively by the seismogenic sources, which are considered in the present paper as well, in accordance with [ 20 , 21 ]. To consider the roots of interest of the relation (A16), note that, in the absence of any sources in the system (A14), the roots of Equation (A16) coincide with the roots of the equation

The coefficients

included in the dispersion equation in the form (A17) determine the polarization relations for AGWs:

From the dispersion equation presented in (A17), we present the characteristics of the global evanescent or reactive Lamb waves (see Equation ( 9 ), Section 3 ) and Brunt–Väisälä oscillations (Equation ( 10 ), Section 3 ) [ 20 , 55 , 56 , 57 , 58 , 59 ].…”

Section: (A)supporting

confidence: 60%

“…Note that, as proposed in [ 2 , 13 , 16 , 17 ], the perturbations of the characteristics of VLF waves in the WGEI can be considered as the ionospheric precursors of the most powerful earthquakes and, probably, the formation of hurricanes, respectively. Concerning the earthquakes, the corresponding mechanism of the seismo-ionospheric coupling has been proposed in [ 16 , 18 , 19 , 20 , 21 ]. The optimized method of searching for VLF seismogenic perturbations in the WGEI using the peculiarities of the solar terminator has been used in [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

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Spectral Analysis and Information Entropy Approaches to Data of VLF Disturbances in the Waveguide Earth-Ionosphere

Rapoport

Reshetnyk

Grytsai

et al. 2022

Sensors

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Very low frequency (VLF) signals are considered as an important tool to study ionosphere disturbances. We have studied variations in signal amplitude of the Japanese JJI transmitter received by a network of eight Japan stations. The distinctions between characteristics of daytime and nighttime disturbances are considered. Signal processing based on spectral analysis is used to evaluate typical periodicities in the VLF signals in the time range from minutes to hours. In particular, we have retrieved quasi-wave oscillations of the received signal with periods of 4–10 and 20–25 min, which can be associated with atmospheric gravity waves excited by the solar terminator, earthquakes or other reasons. In addition, oscillations at periods of 3–4 h are observed, probably, caused by long-period gravity waves. We also calculate the information entropy to identify main details in daily VLF variations and influence of solar flares. It is shown that the information entropy increases near sunrise and sunset with seasonal variation, and that solar flares also lead to the growth in information entropy. A theoretical interpretation is given to the typical features of ultra-low frequency modulation of VLF electronagnetic wave spectra in Waveguide Earth-Ionosphere, found by processing the experimental data.

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The coefficients

included in the dispersion equation in the form (A17) determine the polarization relations for AGWs:

Section: (A)supporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Spectral Analysis and Information Entropy Approaches to Data of VLF Disturbances in the Waveguide Earth-Ionosphere

Rapoport

Reshetnyk

Grytsai

et al. 2022

Sensors

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“…The simplified single equation for the electric potential within the conducting media is as follows [93]:…”

Section: The Stationary and Quasi-stationary Currents Problemsmentioning

confidence: 99%

New Insights into the Simulations of Electric Currents for Discharges and ULF Magnetic-Field Perturbations: Applications to the Popocatepetl Volcano and a Micro-Discharge Model

Grimalsky,

Kotsarenko,

Yutsis

et al. 2023

Remote Sensing

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The noise-like behavior of geomagnetic anomalies observed in Tlamacas station (the Popocatepetl volcano, Mexico), linked to the ionization produced by intensive radon release, is presented in the experimental part of the study. The magnetic-field perturbations produced by electrical currents due to micro-discharges on the terrain irregularities are considered in a theoretical model. The simulations demonstrated that the discharge mechanism can generate perturbations with magnitudes of up to 1–10 nT in the ultra-low frequency (ULF)) range of 10−3–10−1 Hz. ULF Magnetic-field perturbations can be higher within storm-weather conditions under an accumulation of electric charges in clouds in the mountainous regions.

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“…5) Fluctuations of temperature observed in temporal correlation with some earthquakes and possibly reconciled with variation of groundwater circulation and uplift or more recently with vapour condensation on surface (Tramutoli et al, 2005). 6) Propagation of acoustic gravity waves (AGW) (Molchanov and Hayakawa, 2008), A physical mechanism of seismoionospheric coupling including both AGW and radon exhalation has been recently suggested (Rapoport et al, 2020). 7) Fluctuation of electric and magnetic field components in a large range of frequencies [from ULF (Uyeda, et al, 2009b;Han et al (2014)] to VHF (Sorokin et al, 2020).…”

Section: Summary Of Claimed Ground-based Earthquake Precursorsmentioning

confidence: 99%

A Critical Review of Ground Based Observations of Earthquake Precursors

2021

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We aim at giving a short review of the seismo-associated phenomena detected on ground that in recent years have been investigated as possible earthquake precursors. The paper comes together with a companion article–published on this same volume by Picozza et al., 2021–devoted to summarize the space-based observation of earthquake–precursors by satellites missions. In the present work, we give an overview of the observations carried out on ground in order to identify earthquake precursors by distinguishing them from the large background constituted by both natural non-seismic and artificial sources. We start discussing the measurements of mechanical parameters and variations of geochemical fluids detected before earthquakes; then we review thermal and atmospheric oscillations; finally, observations of electromagnetic and ionospheric parameters possibly related to the occurrence of impeding earthquakes are discussed. In order to introduce a so large field of research, we focus only on some main case studies and statistical analyses together with the main hypotheses and models proposed in literature in order to explain the observed phenomenology.

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Algorithm for modeling electromagnetic channel of seismo-ionospheric coupling (SIC) and the variations in the electron concentration

Cited by 8 publications

References 56 publications

Spectral Analysis and Information Entropy Approaches to Data of VLF Disturbances in the Waveguide Earth-Ionosphere

Spectral Analysis and Information Entropy Approaches to Data of VLF Disturbances in the Waveguide Earth-Ionosphere

New Insights into the Simulations of Electric Currents for Discharges and ULF Magnetic-Field Perturbations: Applications to the Popocatepetl Volcano and a Micro-Discharge Model

A Critical Review of Ground Based Observations of Earthquake Precursors

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