The State and Dynamics of the Ionosphere from Synchronous Records of ULF/VLF and HF/VHF Radio Signals at Geophysical Observatory “Mikhnevo”

Ryakhovskii, I. A.; Гаврилов, Б. Г.; Poklad, Yu. V.; Bekker, Susanna; Ermak, Vladimir

doi:10.1134/s1069351321050177

Cited by 18 publications

(13 citation statements)

References 28 publications

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“…Geomagnetic field variations and radio waves in the frequency range up to 60 MHz, surface electric field variations, Extremely Low Frequency (ELF)/Very Low Frequency (VLF) radio emission parameters from lightning discharges and VLF radio signals (Ryakhovskii et al., 2021), acoustic and seismic observations are constantly registered in MIK. The joint analysis of data on variations of various physical fields in one point allows us to investigate the propagation parameters and the mechanisms of interrelation of various geophysical disturbances.…”

Section: Introductionmentioning

confidence: 99%

Global Electromagnetic Disturbances Caused by the Eruption of the Tonga Volcano on 15 January 2022

et al. 2022

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The study is devoted to the analysis of geomagnetic field disturbances and the response of the Schumann resonance (SR) during the eruption of the Tonga volcano in 2022. The data on geomagnetic field variations at distances from 800 to 15,000 km from the volcano according to the INTERMAGNET network and parameters of SR signals recorded at Mikhnevo Observatory in Russia were used. The source of global geomagnetic disturbances are acoustic–gravity waves (AGWs), which caused changes in ionospheric conductivity, values of ionospheric currents, and the geomagnetic field. The propagation velocity of magnetic disturbances 263 ± 5 m/s, corresponding to the AGWs velocity, was determined and an independent estimate of the time of the eruption phase that caused the generation of the atmospheric wave (4:14 ± 10 UT) was obtained. A new method of processing the results of measurements of SR disturbance with a time resolution of 5 min instead of the usual 10–15 min allowed not only to detect but also to study this phenomenon in detail. The peculiarities of signals related to the number and energy of lightning discharges were revealed. Synchronous measurements of SR signals and geomagnetic field variations in a single observatory for the first time allowed to obtain an independent estimate of the eruption time and the electromagnetic disturbance propagation rate.

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Section: Introductionmentioning

confidence: 99%

Global Electromagnetic Disturbances Caused by the Eruption of the Tonga Volcano on 15 January 2022

et al. 2022

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“…The observatory is located at a considerable distance from large settlements and industrial facilities. Since 2011, it has been continuously registering electromagnetic signals in the ELF/VLF frequency range (Ryakhovskii et al., 2021). Induction magnetometers Metronix MFS‐06 oriented in the direction of magnetic North‐South and West‐East are used as sensors.…”

Section: Instrumentation and Observationmentioning

confidence: 99%

Investigation of the Reaction of Schumann Resonances to Short Transient Geophysical Events Under the Influence of Atmospheric Electromagnetic Noise

et al. 2022

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Schumann resonances (SR) are electromagnetic radiation (EMR) that constantly exist in the Earth's atmosphere, the spectrum of which is characterized by the presence of pronounced and fairly stable frequency maxima. In 1952, Schumann (1952 theoretically predicted the existence of resonant modes at frequencies close to 8, 14, 20, … Hz resulting from interference of low-frequency EMR in the Earth-ionosphere waveguide. Due to their global nature, SR can be reliably recorded in any region on the Earth's surface (Sentman & Fraser, 1991) and are an indicator of global thunderstorm activity on the planet (Clayton & Polk, 1976;Heckman et al., 1998), since the exact values of the frequency of peaks of the SR spectrum are associated with the spatiotemporal distribution and intensity of thunderstorms (

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“…The purpose of this study is to compare the results of calculations of the spatiotemporal dynamics of electron concentrations obtained using four‐, five‐, and eight‐component models of the ionization‐recombination cycle of the ionospheric D‐region, and to verify the constructed models using the data on the propagation of VLF signals obtained in the Mikhnevo geophysical observatory (GPO) (55°N 38°E) from European transmitters (Ryakhovskii et al., 2021). An analysis of the results obtained is necessary to determine the minimum set of charged components of the lower ionosphere, which should be included in the plasma‐chemical model.…”

Section: Introductionmentioning

confidence: 99%

“…To date, a lot of experimental data on the amplitude‐phase characteristics of VLF signals received from transmitters located around the world has been accumulated. Long‐term measurements of the amplitude and phase of the radio wave obtained during solar X‐ray flares of various classes make it possible to qualitatively and quantitatively evaluate the predictive capabilities of the constructed theoretical models of the lower ionosphere below the signal reflection height (Palit et al., 2013; Ryakhovskii et al., 2021).…”

Section: Introductionmentioning

confidence: 99%

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Comparison and Verification of the Different Schemes for the Ionization‐Recombination Cycle of the Ionospheric D‐Region

2022

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The issue of modeling the Earth's lower ionosphere in calm and disturbed conditions remains one of the most urgent issues in atmospheric research. The difficulty of obtaining experimental data at heights of the D-region (50-90 km) hinders the construction of good quality empirical models of ionospheric parameters; therefore, the dynamics of the component concentrations under conditions of disturbances (e.g., X-ray flares) are typically described by theoretical models of varying complexity. Considering the dynamics of a large number of charged and small neutral components allows, a more detailed and interconnected description of the photochemistry of the medium (

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The State and Dynamics of the Ionosphere from Synchronous Records of ULF/VLF and HF/VHF Radio Signals at Geophysical Observatory “Mikhnevo”

Cited by 18 publications

References 28 publications

Global Electromagnetic Disturbances Caused by the Eruption of the Tonga Volcano on 15 January 2022

Global Electromagnetic Disturbances Caused by the Eruption of the Tonga Volcano on 15 January 2022

Investigation of the Reaction of Schumann Resonances to Short Transient Geophysical Events Under the Influence of Atmospheric Electromagnetic Noise

Comparison and Verification of the Different Schemes for the Ionization‐Recombination Cycle of the Ionospheric D‐Region

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