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Your search keyword '"Mandrikova, Oksana"' showing total 39 results
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39 results on '"Mandrikova, Oksana"'

9. Natural Data Analysis Method Based on Wavelet Filtering and NARX Neural Networks †.

Author

Mandrikova, Oksana, Polozov, Yurii, and Mandrikova, Bogdana

Subjects
ANOMALY detection (Computer security), STOCHASTIC processes, NEURAL computers, WAVELETS (Mathematics), INFORMATION filtering
Abstract

A method for analyzing natural data and detecting anomalies is proposed. The method is based on combining wavelet filtering operations with the NARX neural network. The analysis of natural data and the detection of anomalies are of particular relevance in the problems of geophysical monitoring. An important requirement of these methods is their adaptability, accuracy and efficiency. Efficiency makes it possible to detect anomalies timely in order to prevent catastrophic natural phenomena. Wavelet filtering operations include the application of a multi-scale analysis construction and threshold functions. The article proposes a wavelet filtering algorithm and a method for estimating thresholds based on a stochastic approach. The operations of the method implementation are described. It is shown that the use of wavelet filtering allows one to suppress noise, simplifies the data structure and, as a result, allows one to obtain a more accurate NARX neural network model. The effectiveness of the method for detecting ionospheric anomalies during periods of magnetic storms is shown using the data of the critical frequency of the ionosphere as an example. [ABSTRACT FROM AUTHOR]

Published
2023
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13. Method of Wavelet-Decomposition to Research Cosmic Ray Variations: Application in Space Weather.

Author

Mandrikova, Oksana and Mandrikova, Bogdana

Subjects
*SPACE environment, *SOLAR wind, *COSMIC rays, *INTERPLANETARY magnetic fields, *SOLAR magnetic fields, *SOLAR-terrestrial physics, *CORONAL mass ejections
Abstract

Since their discovery, cosmic rays have been an integral part of the development of fundamental physics, from the discovery of radiation coming to the Earth from outer space and the identification of high-energy particles in it, as well as new fundamental symmetries in the laws of nature, to the knowledge of residual matter and magnetic fields in interstellar space. Cosmic rays are used in a number of fundamental and applied research in solar-terrestrial physics and are important in the research of the near-Earth space processes. Cosmic ray variations observed on the Earth's surface are an integral result of various solar, heliospheric, magnetospheric and atmospheric phenomena. The most significant changes in cosmic ray parameters are caused by coronal mass ejections and subsequent changes in the parameters of the interplanetary magnetic field and solar wind. Therefore, the study of cosmic rays makes it possible to obtain valuable information about the processes in the near-Earth space and in the Earth's magnetosphere during disturbed periods. This article proposes a method for analyzing cosmic ray variations. It is based on the use of wavelet data decomposition operations and their combination with threshold functions. By using adaptive thresholds, the operations for detecting anomalous changes in data and for suppressing the noise were developed. Anomalies in cosmic rays can cause radiation hazard for astronauts, radio communication failures, as well as malfunctions in satellites, leading to the loss of orientation and destruction. Therefore, the task of timely diagnostics of anomalies is urgent. The paper describes the algorithms for the implementation of the method and shows their application in the space weather problem. We used data from the network of ground stations of neutron monitors. The efficiency of the method for detecting abnormal changes of different amplitudes and durations is shown. Application of the method made it possible to detect clearly and to evaluate Forbush effects in cosmic rays, which precede the onset of magnetic storms of various nature and strength. [ABSTRACT FROM AUTHOR]

Published
2021
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20. Observations of Space Weather Effects from the Moscow University Nano-satellite Constellation Sozvezdie-270

Author

Svertilov, Sergey, Bogomolov, Vitaly, Bogomolov, Andrey, Osedlo, Vladislav, Bengin, Victor, Zolotarev, Ivan, Iyudin, Anatoly, Kalegaev, Vladimir, Myagkova, Irina, Yashin, Ivan, Antonyuk, Georgy, Zhilchenko, Karina, Sazonov, Vasilii, Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Dmitriev, Alexei, editor, Lichtenberger, Janos, editor, Mandrikova, Oksana, editor, and Nahayo, Emmanuel, editor

Published
2023
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21. Variations in the Parameters of the Signal from the A1F3 VLF Transmitter Received at the Mikhnevo Geophysical Observatory During a Series of Earthquakes in Turkey in February 2023

Author

Poklad, Yu. V., Ermak, V. M., Gavrilov, B. G., Ryakhovskiy, I. A., Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Dmitriev, Alexei, editor, Lichtenberger, Janos, editor, Mandrikova, Oksana, editor, and Nahayo, Emmanuel, editor

Published
2023
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26. Monitoring of Radiation Fields in Near-Earth Space with the Use of Kodiz Instrument On-Board Cubesat Monitor-1

Author

Antonyuk, G. I., Benghin, V. V., Zolotarev, I. A., Sazonova, A. V., Osedlo, V. I., Sazonov, Vas V., Nechaev, O. Yu., Svertilov, S. I., Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Dmitriev, Alexei, editor, Lichtenberger, Janos, editor, Mandrikova, Oksana, editor, and Nahayo, Emmanuel, editor

Published
2023
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29. Analysis of Electromagnetic Radiation During Shiveluch and Bezymyanniy Volcano Eruptions from 2017 to 2023

Author

Malkin, Evgeniy, Cherneva, Veronika, Makhlai, Dmitriy, Cherneva, Nina, Sannikov, Dmitriy, Druzhin, Gennadiy, Akbashev, Rinat, Holzworth, Robert, Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Dmitriev, Alexei, editor, Lichtenberger, Janos, editor, Mandrikova, Oksana, editor, and Nahayo, Emmanuel, editor

Published
2023
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31. Advanced Instruments for Geo and Helio Environment Monitoring on the Cubesat Format Spacecraft

Author

Bogomolov, Vitaly, Svertilov, Sergey, Osedlo, Vladislav, Bengin, Victor, Zolotarev, Ivan, Iyudin, Anatoly, Nechaev, Oleg, Yashin, Ivan, Antonyuk, Georgy, Kucherenko, Ivan, Korzhik, Mikhail, Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Dmitriev, Alexei, editor, Lichtenberger, Janos, editor, Mandrikova, Oksana, editor, and Nahayo, Emmanuel, editor

Published
2023
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36. Relation Between Sprites and Whistlers Based on AWDANET and WWLLN Data

Author

Malkin, Evgeniy, Kazakov, Evgeniy, Cherneva, Nina, Lichtenberger, Janos, Sannikov, Dmitriy, Koronczay, David, Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Dmitriev, Alexei, editor, Lichtenberger, Janos, editor, Mandrikova, Oksana, editor, and Nahayo, Emmanuel, editor

Published
2023
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37. Space Project 'Modulation', a New Approach to Studying the Fluxes of Galactic Cosmic Rays in the Field of Solar Modulation Energies

Author

Kalegaev, V. V., Karmanov, D. E., Kurganov, A. A., Panov, A. D., Podzolko, M. V., Podorozhny, D. M., Turundaevsky, A. N., Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Dmitriev, Alexei, editor, Lichtenberger, Janos, editor, Mandrikova, Oksana, editor, and Nahayo, Emmanuel, editor

Published
2023
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