@PhDThesis{Deggeroni:2024:CaAtOn,
author = "Deggeroni, Vinicius",
title = "Caracteriza{\c{c}}{\~a}o de atividade de ondas chorus na
magnetosfera sob efeito de estruturas interplanet{\'a}rias
distintas e sua rela{\c{c}}{\~a}o com a variabilidade de fluxo
de el{\'e}trons no cintur{\~a}o de radia{\c{c}}{\~a}o de Van
Allen",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2024",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2023-11-29",
keywords = "ondas chorus, Van Allen, fluxo de el{\'e}trons, energia
relativ{\'{\i}}stica, estruturas interplanet{\'a}rias, chorus
waves, Van Allen, electron flux, interplanetary structures,
radiation belts.",
abstract = "A din{\^a}mica da magnetosfera terrestre {\'e} impactada pelas
estruturas do vento solar, tais como Eje{\c{c}}{\~o}es de Massa
Coronal Interplanet{\'a}rias (ICMEs) e Fluxos de Vento Solar de
Alta Velocidade (HSSs). Essas estruturas injetam energia na
magnetosfera, resultando na excita{\c{c}}{\~a}o de ondas
magnetosf{\'e}ricas em uma ampla gama de frequ{\^e}ncias,
incluindo as ondas de Chorus do modo Whistler, com
frequ{\^e}ncias variando de centenas de Hz at{\'e} cerca de 10
kHz. Estas ondas desempenham um papel significativo na
intera{\c{c}}{\~a}o ressonante com el{\'e}trons no
cintur{\~a}o de radia{\c{c}}{\~a}o externo da Terra, levando
{\`a} perda ou acelera{\c{c}}{\~a}o localizada dessas
part{\'{\i}}culas. Nesta tese de doutorado, investigamos a
influ{\^e}ncia das estruturas interplanet{\'a}rias na atividade
das ondas Chorus. Selecionamos e analisamos cinco estudos de caso,
considerando diferentes configura{\c{c}}{\~o}es do campo
magn{\'e}tico interplanet{\'a}rio (IMF). Nossos resultados
revelam uma not{\'a}vel variabilidade no fluxo de el{\'e}trons
de alta energia em todos os casos investigados, ressaltando a
influ{\^e}ncia das ondas Chorus. Al{\'e}m disso, identificamos
que essas ondas podem ressoar com os el{\'e}trons do
cintur{\~a}o de radia{\c{c}}{\~a}o, resultando em perda ou
acelera{\c{c}}{\~a}o localizada dessas part{\'{\i}}culas. Os
resultados tamb{\'e}m indicam que a atividade das ondas Chorus na
magnetosfera interna {\'e} significativamente afetada durante
per{\'{\i}}odos de maior atividade das ondas Chorus,
particularmente quando a componente Bz do IMF {\'e} negativa.
Observa-se que a competi{\c{c}}{\~a}o entre ondas Chorus
paralelas e quase obl{\'{\i}}quas desempenha um papel crucial na
variabilidade do fluxo de el{\'e}trons. Essas descobertas
s{\~a}o inovadoras e contribuem para a compreens{\~a}o dos
mecanismos din{\^a}micos que afetam o fluxo de el{\'e}trons no
cintur{\~a}o de radia{\c{c}}{\~a}o externo durante a
influ{\^e}ncia das estruturas do vento solar. Esses resultados
representam uma contribui{\c{c}}{\~a}o significativa {\`a}
literatura e demonstram que a an{\'a}lise das
caracter{\'{\i}}sticas das ondas de Chorus por meio de diversas
t{\'e}cnicas permite a identifica{\c{c}}{\~a}o dos principais
mecanismos respons{\'a}veis pela variabilidade do fluxo de
el{\'e}trons no cintur{\~a}o de radia{\c{c}}{\~a}o externo sob
a influ{\^e}ncia de diferentes estruturas do vento solar.
ABSTRACT: The dynamics of the Earths magnetosphere are influenced
by solar wind structures, such as Interplanetary Coronal Mass
Ejections (ICMEs) and High-Speed Solar Wind Streams (HSSs). These
structures inject energy into the magnetosphere, resulting in the
excitation of magnetospheric waves over a wide range of
frequencies, including Whistler-mode Chorus waves with frequencies
ranging from hundreds of Hz to approximately 10 kHz. These waves
play a significant role in the resonant interaction with electrons
in the Earths outer radiation belt, leading to the localized loss
or acceleration of these particles. In this doctoral thesis, we
investigate the influence of interplanetary structures on Chorus
wave activity. We select and analyze five case studies,
considering different configurations of the interplanetary
magnetic field (IMF). Our results reveal remarkable variability in
the flux of high-energy electrons in all investigated cases,
emphasizing the influence of Chorus waves. Additionally, we
identify that these waves can resonate with radiation belt
electrons, resulting in localized particle loss or acceleration.
The results also indicate that the activity of Chorus waves in the
inner magnetosphere is significantly affected during periods of
increased Chorus wave activity, particularly when the Bz component
of the IMF is negative. We observe that the competition between
parallel and nearly oblique Chorus waves plays a crucial role in
the variability of electron flux. These findings are innovative
and contribute to the understanding of dynamic mechanisms
affecting electron flux in the outer radiation belt during the
influence of solar wind structures. These results represent a
significant contribution to the literature and demonstrate that
the analysis of Chorus wave characteristics through various
techniques allows the identification of the key mechanisms
responsible for electron flux variability in the outer radiation
belt under the influence of different solar wind structures.",
committee = "Alves, L{\'{\i}}via Ribeiro (presidente) and Silva,
L{\'{\i}}gia Alves da (orientadora) and Silva, Marlos Rockenbach
da (orientador) and Mendes Junior, Odim and Marchezi, Jos{\'e}
Paulo and Rojas, Flavia Reis Cardoso",
englishtitle = "Characterization of chorus wave activity in the magnetosphere
under the influence of different interplanetary structures and its
relationship with electron flux variability in the Van Allen
radiation belt",
language = "pt",
pages = "179",
ibi = "8JMKD3MGP3W34T/4APKG88",
url = "http://urlib.net/ibi/8JMKD3MGP3W34T/4APKG88",
targetfile = "publicacao.pdf",
urlaccessdate = "28 abr. 2024"
}