@MastersThesis{Deggeroni:2019:EsDeFl,
author = "Deggeroni, Vinicius",
title = "Estudo do decr{\'e}scimo no fluxo de el{\'e}trons do
cintur{\~a}o de radia{\c{c}}{\~a}o de Van Allen sob
influ{\^e}ncia de ICMEs",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2019",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2019-03-08",
keywords = "Cintur{\~a}o de radia{\c{c}}{\~a}o de Van Allen, dropout, fluxo
de el{\'e}trons relativ{\'{\i}}sticos, Van Allen Probes,
eje{\c{c}}{\~o}es de massa coronais interplanet{\'a}rias, Van
Allen radiation belt, dropout, relativistic electron flow, Van
Allen Probes, interplanetary coronal mass ejections.",
abstract = "O objetivo geral deste trabalho {\'e} estudar o comportamento do
fluxo de el{\'e}trons do cintur{\~a}o de radia{\c{c}}{\~a}o de
Van Allen, sob a influ{\^e}ncia de Eje{\c{c}}{\~o}es de Massa
Coronal Interplanet{\'a}rias - ICMEs. S{\~a}o utilizados dados
do instrumento RBSP-ECT Radiation Belt Storm Probes Energetic
Particles Composition \& Thermal Plasma Suite, das duas sondas
g{\^e}meas da miss{\~a}o Van Allen Probes, que medem o fluxo de
el{\'e}trons do cintur{\~a}o de radia{\c{c}}{\~a}o. Para
quantizar a intensidade das estruturas causadoras das tempestades
foram utilizados dados do {\'{\i}}ndice Dst - Disturbance Storm
Time, e os par{\^a}metros do Vento Solar, tais como: densidade,
temperatura, velocidade e campo magn{\'e}tico, medidos in situ,
pelos sat{\'e}lites ACE - Advanced Composition Explorer e DSCOVR
- Deep Space Climate Observatory. A investiga{\c{c}}{\~a}o
desses dados visa entender os fen{\^o}menos f{\'{\i}}sicos que
causam varia{\c{c}}{\~o}es no fluxo de el{\'e}trons, com o foco
na perda de el{\'e}trons do cintur{\~a}o, fen{\^o}meno
conhecido por dropouts. Para todo o intervalo de tempo de Agosto
de 2012 a Dezembro de 2016 foram selecionados apenas eventos com
presen{\c{c}}a de ICMEs, que por sua vez foram classificados
quanto {\`a}s varia{\c{c}}{\~o}es observacionais no
cintur{\~a}o de radia{\c{c}}{\~a}o e quanto ao tipo e
presen{\c{c}}a de nuvem magn{\'e}tica geradora do
dist{\'u}rbio. Para cada classe estudada foi usando o m{\'e}todo
de an{\'a}lise de {\'e}poca superposta, visando assim relacionar
estatisticamente eventos distintos em meios distintos. O estudo de
caso para dois eventos, classificados quanto ao tipo de
recupera{\c{c}}{\~a}o no cintur{\~a}o de radia{\c{c}}{\~a}o
mostrou que a componente Bz do campo magn{\'e}tico
interplanet{\'a}rio tem rela{\c{c}}{\~a}o com a variabilidade
na popula{\c{c}}{\~a}o das part{\'{\i}}culas no cintur{\~a}o
externo, para as duas classes estudadas. Foi tamb{\'e}m
constatada a variabilidade nos el{\'e}trons
relativ{\'{\i}}sticos, em todas as classes atrav{\'e}s do
m{\'e}todo de an{\'a}lise de {\'e}poca superposta empregado.
Foi encontrado um padr{\~a}o de resposta da an{\'a}lise de
{\'e}poca superposta no cintur{\~a}o de radia{\c{c}}{\~a}o, em
que a din{\^a}mica de el{\'e}trons relativ{\'{\i}}sticos para
o cintur{\~a}o externo tem rela{\c{c}}{\~a}o com as
varia{\c{c}}{\~o}es observadas na componente Bz do campo
interplanet{\'a}rio quando negativo, principalmente para a
separa{\c{c}}{\~a}o de classes quanto ao tipo de nuvem.
Al{\'e}m disso, esse estudo concluiu que eventos com assinaturas
de alta varia{\c{c}}{\~a}o no fluxo de el{\'e}trons no
cintur{\~a}o externo, foram encontrados para per{\'{\i}}odos de
maior geo-efetividade e que ICMEs contendo nuvens magn{\'e}ticas
tem maior propens{\~a}o em causar dropout. ABSTRACT: The general
objective of this work is to study the behavior of the electron
flux of the Van Allen radiation belt under the influence of
Interplanetary Coronal Mass Ejections (ICMEs).Data from the
RBSP-ECT-Radiation Belt Storm Probes (Energetic Particles
Composition Thermal Plasma Suite), from the two twin probes of the
Van Allen Probes mission, located in the radiation belt, are
used.To quantify the intensity of the storm-causing structures,
the Dst-Disturbance Storm Time index will be used, and the solar
wind parameters density, temperature, velocity and magnetic field,
as measured by ACE satellites - Advanced Composition Explorer and
DSCOVR - Deep Space Climate Observatory.The investigation of these
data aims to understand the physical phenomena that cause
variations in the flow of electrons, such as the focus on
dropouts, loss of electrons from the belt. For the entire time
period from August 2012 to December 2016, only events with
presence of ICMEs were selected, which in turn were classified for
the observational variations in the radiation belt and the type
and presence of magnetic cloud generating the disturbance. For
each class studied was using the method of analysis of overlapping
time, in order to relate statistically different events in
different media. The case study for two events, classified
according to the type of recovery in the radiation belt, showed
that the Bz component of the interplanetary magnetic field is
related to the variability in the population of the particles in
the outer belt, for the two classes studied. Variability was also
observed in relativistic electrons, in all classes through the
method of superimposed time analysis employed. It was found a
response pattern of the superimposed time analysis in the
radiation belt, in which the dynamics of relativistic electrons
for the outer belt is related to the observed variations in the
component Bz of the interplanetary field when negative, mainly for
the separation of classes the type of cloud. In addition, this
study concluded that events with signatures of high variation in
the electron flow in the outer belt were found for periods of
greater geo-effectiveness and that ICMEs containing magnetic
clouds are more likely to cause dropout.",
committee = "Saba, Marcelo Magalh{\~a}es Fares (presidente) and Silva, Marlos
Rockenbach da (orientador) and Schuch, Nelson Jorge (orientador)
and Silva, L{\'{\i}}gia Alves da and Alves, Maria Virginia and
Rojas, Fl{\'a}via Reis Cardoso",
englishtitle = "Study of the decrease in Van Allen radiation belt electrolystem
flow under ICME influence",
language = "pt",
pages = "131",
ibi = "8JMKD3MGP3W34R/3STB2S5",
url = "http://urlib.net/ibi/8JMKD3MGP3W34R/3STB2S5",
targetfile = "publicacao.pdf",
urlaccessdate = "25 abr. 2024"
}