Petrenko B. Current sheet dynamics in the Earth's magnetotail – Qualified scientific work on the rights of the manuscript

Українська версія

Thesis for the degree of Doctor of Philosophy (PhD)

State registration number

0823U101589

Thesis Registration Form

0823U101589.pdf

Applicant for

Bohdan A. Petrenko

Specialization

104 - Фізика та астрономія

Date of defense

18-12-2023

Specialized Academic Board

2907

Taras Shevchenko National University of Kyiv

Essay

This thesis is devoted to the study of dynamic processes occurring in the current sheet of the Earth's magnetotail. This region can be considered as a close prototypical astrophysical "laboratory" of the plasma environment with the ability to obtain data with high accuracy on such spatial and temporal scales that cannot be reproduced in terrestrial conditions. The dynamics of the current sheet are varied by a set of energetic processes that can occur in it. These are flapping oscillations, current disruption, bursty bulk flows and associated dipolarization fronts, acceleration of charged particles due to transient structures, and the presence of a turbulent regime. The investigation of these processes opens the way to an understanding of global magnetospheric dynamics, both in the context of the physics of the near-Earth environment and plasma physics, and in the context of the formation of space weather. Similar processes are also observed among other astrophysical objects — these are regions of solar flares, relativistic jets in the active nuclei of galaxies, magnetospheres of pulsars, etc. The study of the above physical processes is one of the most urgent tasks of plasma physics. Competing models of magnetospheric substorm development, the neutral line model, and the current sheet rupture model are briefly considered in the thesis. It is noted that recent studies using modeling of magnetospheric dynamics have shown that reconnection and disruption of current sheet occur simultaneously in different parts of the extended tail of the magnetosphere, and with the excitation of flapping oscillations of the current sheet. This result explains well why the same observations could be interpreted in these competing models of substorm development.

Thesis supervisor

Liudmyla V. Kozak

Official opponents

Andrii V. Zalizovskyi
Yurii V. Yakovenko

Reviewers

Bohdan I. Hnatyk
Eduard V. Horbar

Research papers

Kozak, L. V., Petrenko, B. A., Kronberg, E. A., Grigorenko, E. E., Kozak, P. M., & Reka, K. D. (2020). Variations in the Plasma Parameters of the Earth’s Magnetotail during Substorm Initiation. Kinematics and Physics of Celestial Bodies, 36, 94-102.

Petrenko, B. A., & Kozak, L. V. (2020). Dynamics of Magnetic Structures during a Magnetospheric Substorm. Kinematics and Physics of Celestial Bodies, 36, 238-242.

Kozak, L. V., Petrenko, B. A., Lui, A. T. Y., Kronberg, E. A., & Daly, P. W. (2021). Processes in the current disruption region: From turbulence to dispersion relation. Journal of Geophysical Research: Space Physics, 126(1), e2020JA028404.

Kozak, L. V., Petrenko, B. A., Grigorenko, E. E., & Kronberg, E. A. (2022). Comparison of Ground-Based and Satellite Geomagnetic Pulsations during Substorms. Kinematics and Physics of Celestial Bodies, 38(1), 1-10.

Petrenko, B., Kozak, L., Kronberg, E., & Akhmetshyn, R. (2023). Multispacecraft wave analysis of current sheet flapping motions in Earth's magnetotail. Frontiers in Astronomy and Space Sciences, 9, 1071824.

Петренко Б., Козак Л., Кронберг Е., Баллаї І. (2022). Aпробація хвильового дисперсійного аналізу за допомогою багатосупутникових методів. Вісник Київського національного університету імені Тараса Шевченка, Астрономія, 66, 20-25.

Petrenko, B. (2023). Multiscale dissipative processes in the Earth’s magnetotail. Kinematics and Physics of Celestial Bodies, 39(5), 300-303.

Kozak, L. V., & Petrenko, B. A. (2016). Statistical analysis of plasma turbulence using Cluster II data. Astronomical School’s Report, 12(2), 179-184.

Kоzak, L., Petrenko, B., Kronberg, E., Grigorenko, E., & Lui, A. (2018). Characteristics of the turbulence processes in the magnetohydrodynamic environment. Athens Journal of Sciences, 5(2).

Kozak, L., Petrenko, B., Kronberg, E., Grigorenko, E., Lui, E., & Cheremnykh, S. (2018). Spectra of Turbulence during the Dipolarization of the Magnetic Field. Kinematics and Physics of Celestial Bodies, 34, 258-269.

Kozak, L., Petrenko, B., Kronberg, E., Prokhorenkov, A., Grigorenko, E., Cheremnyh, O., Cheremnyh, S., Lui, A., Kozak, P., Kundelko, I. (2018). Turbulent processes in the Earth’s magnetotail: statistical and spectral analysis. Space Science and Technology, 24(3), 55-68.

Kozak, L., Petrenko B., Lui A., Kronberg E., Grigorenko E. and Prokhorenkov A. (2018). Turbulent Processes in the Earth's Magnetotail: Spectral and Statistical Research. Annales Geophysicae, 36(5), 1303-1318.

Kronberg, E. A., Grigorenko, E. E., Malykhin, A. Y., Kozak, L., Petrenko, B., Vogt, M. F., et al. (2019). Acceleration of ions in Jovian plasmoids: Does turbulence play a role?. Journal of Geophysical Research: Space Physics, 124(7), 5056-5069.

Files

autoreferat-Анотація_Петренко.pdf

Дисертація_Петренко.pdf

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