Dr. Stanislav I. Kozlov Profile

Dr. Stanislav I. Kozlov

at Sadovsky Institute of Geosphere Dynamics

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Publications (5)

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 | 13 December 2018 Paper

Verification of the deterministic-probabilistic model of the D–region of the ionosphere by the radio physical data obtained in the geophysical observatory Mikhnevo

S. Bekker, A. Lyakhov, S. Kozlov, I. Ryakhovsky

Proceedings Volume 10833, 108339P (2018) https://doi.org/10.1117/12.2504295

KEYWORDS: Data modeling, Transmitters, Observatories, Ionization, Solar processes, Systems modeling, Databases, Wave propagation, Differential equations

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Proceedings Article | 13 December 2018 Paper

The requirement justification to the ionosphere models for the UHF-SHF radars

S. Kozlov, A. Lyakhov, S. Yakubovskiy, S. Bekker, B. Gavrilov, Y. Poklad, V. Ermak

Proceedings Volume 10833, 108339O (2018) https://doi.org/10.1117/12.2504294

KEYWORDS: Radar, Error analysis, Data modeling, Computer simulations, Numerical simulations, Wave propagation, Radio propagation, Refraction, Optimization (mathematics), Refractive index

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Proceedings Article | 13 December 2018 Paper

Ionization of the lower ionosphere during the x-ray solar flare on September 6, 2017

I. Ryakhovskiy, B. Gavrilov, A. Lyakhov, Y. Poklad, S. Bekker, S. Kozlov

Proceedings Volume 10833, 108339Y (2018) https://doi.org/10.1117/12.2504402

KEYWORDS: X-rays, Neon, Satellites, Solar processes, Ionization, Receivers, Satellite navigation systems, Waveguides, Ultraviolet radiation, Wave propagation

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Proceedings Article | 4 October 2017 Paper

Space-based lidar for monitoring the Martian canyons

Leonid Smirnov, Victoria Ryzhova, Aleksander Grishkanich, Nikita Paklinov, Stanislav Kozlov, Artemia Hvorostovsky, Anton Antonov, Egor Kolmakov, Ilya Kravtsov, Nail Hafizov

Proceedings Volume 10429, 104290E (2017) https://doi.org/10.1117/12.2280013

KEYWORDS: Mars, LIDAR, Planets, Receivers, Raman scattering, Liquids, Methane, Ultraviolet radiation

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