Prof. Boris G. Gavrilov Profile

Prof. Boris G. Gavrilov

at Sadovsky Institute of Geosphere Dynamics

SPIE Involvement:

Author

Publications (22)

Proceedings Article | 16 December 2021 Paper

Studies of the state and dynamics of the mid-latitude ionosphere according to the data of the radiophysical complex in the Geophysical Observatory Mikhnevo

I. Ryakhovskiy, B. Gavrilov, Yu. Poklad, S. Bekker, V. Ermak

Proceedings Volume 11916, 1191673 (2021) https://doi.org/10.1117/12.2603443

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Proceedings Article | 16 December 2021 Paper

The terminator influence on the amplitude of VLF stations’ signals registered at the geophysical observatory «Mikhnevo»

E. Kozakova, I. Ryakhovskiy, Yu. Poklad, B. Gavrilov

Proceedings Volume 11916, 1191681 (2021) https://doi.org/10.1117/12.2603385

KEYWORDS: Sun, Radio propagation, Electromagnetism, Waveguides, Solar processes, Signal processing, Wave propagation, Transmitters

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Proceedings Article | 16 December 2021 Paper

Influence of electronic emissions on the state of the lower ionosphere and amplitude characteristics of VLF radio signals

K. Babaykina, B. Gavrilov, Yu. Poklad

Proceedings Volume 11916, 119167P (2021) https://doi.org/10.1117/12.2603265

KEYWORDS: Transmitters, Satellites, Particles, Wave propagation, Solar processes, Observatories, Ionization, Waveguides, Solar radiation, Sensors

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Proceedings Article | 16 December 2021 Paper

Concentration distribution of electrons in the lower and upper ionosphere during the X-class solar flare 10.06.2014

I. Ryakhovskiy, S. Bekker, B. Gavrilov, Yu. Poklad

Proceedings Volume 11916, 1191689 (2021) https://doi.org/10.1117/12.2603452

KEYWORDS: Electrons, Solar processes, Satellite navigation systems, X-rays, Receivers, Solar radiation, Satellites, Observatories, Ionization, Atmospheric propagation

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Proceedings Article | 12 November 2020 Paper

Unipolar component of the electric field and vertical atmospheric currents according to the GFO “Mikhnevo”

V. Rybakov, B. Gavrilov, V. Ermak, Yu. Poklad, I. Ryakhovskiy, K. Babaykina

Proceedings Volume 11560, 115608T (2020) https://doi.org/10.1117/12.2575632

KEYWORDS: Atmospheric particles, Earth's atmosphere, Atmospheric sciences, Meteorology, Atmospheric physics, Sensors, Electrodes, Modulation, Distortion, Calibration

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Proceedings Article | 12 November 2020 Paper

Dependence of variation of parameters of the D-layer of the ionosphere during x-ray flashes of M and X classes from their energy

Yu. Poklad, B. Gavrilov, V. Ermak, A. Lyakhov, I. Ryakhovskiy, V. Rybakov

Proceedings Volume 11560, 115608P (2020) https://doi.org/10.1117/12.2575607

KEYWORDS: X-rays, Transmitters, Solar radiation models, Atmospheric propagation, Wave propagation, Solar radiation, Sun, Ionization, Waveguides, Radio propagation

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Proceedings Article | 12 November 2020 Paper

Remote electromagnetic and ionospheric effects of the earthquakes in Greece

Boris Gavrilov, Yuri Poklad, Yury Rybnov, Ilya Ryakhovski, Irina Sanina

Proceedings Volume 11560, 1156080 (2020) https://doi.org/10.1117/12.2574912

KEYWORDS: Earthquakes, Acoustics, Earth's atmosphere, Electromagnetism, Atmospheric propagation, Observatories, Wave propagation, Atmospheric physics, Environmental sensing

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Proceedings Article | 12 November 2020 Paper

Mid-latitude ionospheric TEC variations during the period from 2016 to 2019 using GNSS data from the geophysical observatory Mikhnevo

M. Plaksina, I. Ryakhovskiy, B. Gavrilov, Yu. Poklad, S. Bekker

Proceedings Volume 11560, 115608J (2020) https://doi.org/10.1117/12.2575526

KEYWORDS: Satellite navigation systems, Receivers, Ultraviolet radiation, Solar radiation, Observatories, Phase measurement, Sun, Solar processes, Software development

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Proceedings Article | 18 December 2019 Paper

Frontiers in the D-region physics

Andrey Lyakhov, Boris Gavrilov, Julius Zetzer, Yuri Poklad, Ilya Ryakhobskij, Egor Goncharov

Proceedings Volume 11208, 112088Y (2019) https://doi.org/10.1117/12.2540420

KEYWORDS: Atmospheric modeling, Solar radiation models, 3D modeling, Solar processes, Physics, Climatology, Satellites, Atmospheric chemistry, Radio propagation

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Proceedings Article | 18 December 2019 Paper

The comparison of standard and swarm D-layer ionosphere models on the simulation of the x-ray solar flare response

Andrey Lyakhov, Stanislav Kozlov, Tatiana Losseva, Susanna Bekker, Julia Korsunskaya, Boris Gavrilov, Valery Kudryavtsev, Egor Goncharov

Proceedings Volume 11208, 112088Z (2019) https://doi.org/10.1117/12.2540423

KEYWORDS: Solar radiation models, X-rays, Ionization, Ions, Atmospheric modeling

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The contemporary study of the global change of the atmosphere raise up the problem of models verification, namely, we need the quantified metric to compare models. One of such simple approach is to use the evidence on VLF-LF propagation under the X-ray solar flares. Any flare impacts on the middle atmosphere up to 60 km altitude. Its signature in amplitude record is clear and identifiable. We have a variety of radio paths and any season (or even year of solar cycle) in database. All aforementioned arguments make the strong basis for the model check. The response of the lower ionosphere and middle atmosphere to a solar flare depends on the quality of the source term definition and on the correctness of the chemical processes description. Different approaches are known for the derivation of X-ray excess ionization, varying from classic approach¹ to huge Monte Carlo simulations.² We elaborated the numerical model which is combined from an empirical model of ionization (GOES X-ray measurements) and numerical VLF propagation code.³ It successfully reproduced the first phase of the lower ionosphere response to the extremely strong solar X-flare (X9.9) September 06, 2017. Meanwhile, the decay phase was overestimated. Thus we decided to improve the ionosphere model and compare our model with other popular ionization schemes under the flares of various class. Moreover, all ionospheric models under analysis were realised in two modes: the standard mode with constant chemical rates and in the swarm mode with rates dependence on the altitude and ionization rate. The latter have been received in 70-s from complex kinetic simulations of the high altitude nuclear explosion impact on the ionosphere.⁴ We expected the improvement of results for intense flares and we wanted to check the quality of contemporary and old ionosphere models on the modern data. The results prove that (a) all models failed under empirical model of ionization; (b) the most promising model is IDG5 in swarm mode; (c) the problem of the minor neutrals is overestimated.

Proceedings Article | 18 December 2019 Paper

Study of the dynamics of ionospheric irregularities by using a set of GPS receivers

B. Gavrilov, Yu. Poklad, V. Rybakov, I. Ryakhovsky

Proceedings Volume 11208, 1120894 (2019) https://doi.org/10.1117/12.2540627

KEYWORDS: Receivers, Satellites, Satellite navigation systems, Electrons, Global Positioning System, Observatories, Knowledge management, Solar processes, Image registration, Solar radiation models

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Proceedings Article | 18 December 2019 Paper

Determination of absolute values of TEC according to data of GNSS receivers located in one measuring point

Iliya Ryakhovskiy, B. Gavrilov, A. Lyakhov, Y. Poklad, S. Bekker

Proceedings Volume 11208, 112089F (2019) https://doi.org/10.1117/12.2540899

KEYWORDS: Receivers, Satellite navigation systems, Satellites, Global Positioning System, Signal processing, Tomography, Data corrections, Spatial resolution, Radio propagation, MATLAB

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Proceedings Article | 18 December 2019 Paper

Variation of parameters of the D-layer of the ionosphere during powerfull solar x-ray flashes

Yu. Poklad, B. Gavrilov, V. Ermak, A. Lyakhov, I. Ryakhovskiy, V. Rybakov

Proceedings Volume 11208, 112089J (2019) https://doi.org/10.1117/12.2540948

KEYWORDS: X-rays, Transmitters, Ionization, Observatories, Ultraviolet radiation, Satellites, Atmospheric propagation, Solar processes, Solar radiation models, Earth's atmosphere

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