@MastersThesis{Pinto:2017:EsInFe,
author = "Pinto, Ana Clara da Silva",
title = "Estudo da influ{\^e}ncia de feixes de vento solar r{\'a}pido na
varia{\c{c}}{\~a}o diurna da intensidade de raios
c{\'o}smicos",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2017",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2017-06-01",
keywords = "raios c{\'o}smicos, varia{\c{c}}{\~a}o diurna, feixes de vento
solar r{\'a}pido, cosmic rays, diurnal variation, high-speed
solar wind streams.",
abstract = "Raios c{\'o}smicos s{\~a}o part{\'{\i}}culas, de altas
energias, eletricamente carregadas que podem ser de origem solar,
gal{\'a}ctica ou extra-gal{\'a}ctica. No interior da Heliosfera,
o transporte dessas part{\'{\i}}culas sofre
modula{\c{c}}{\~o}es por fen{\^o}menos (recorrentes e
transientes) solares. Dentre as varia{\c{c}}{\~o}es temporais
peri{\'o}dicas da intensidade do fluxo de raios c{\'o}smicos
observados na Terra, este trabalho se concentrou na
varia{\c{c}}{\~a}o diurna, que {\'e} caracterizada por um
comportamento harm{\^o}nico com m{\'a}ximo entre as 12 e 18
horas locais, provocado, principalmente, pelos processos de
difus{\~a}o e convec{\c{c}}{\~a}o das part{\'{\i}}culas
c{\'o}smicas no meio interplanet{\'a}rio. De forma mais
espec{\'{\i}}fica, o objetivo desse trabalho foi estudar as
mudan{\c{c}}as na amplitude e fase da varia{\c{c}}{\~a}o diurna
em diferentes per{\'{\i}}odos do ciclo solar (entre 2007 e 2015)
e per{\'{\i}}odos perturbados pela passagem de feixes de vento
solar r{\'a}pido. Para a realiza{\c{c}}{\~a}o desse estudo,
utilizou-se dados do detector multidirecional de m{\'u}ons,
localizado em S{\~a}o Martinho da Serra (RS) (OES/CRC/INPE),
dados do GDAS (Global Data Assimilation System) e dados do
sat{\'e}lite ACE. Ap{\'o}s a elimina{\c{c}}{\~a}o e
corre{\c{c}}{\~a}o das varia{\c{c}}{\~o}es de contagem,
relacionadas a problemas na eletr{\^o}nica do detector,
estudou-se as varia{\c{c}}{\~o}es associadas a mudan{\c{c}}as
de temperatura e press{\~a}o atmosf{\'e}rica, atrav{\'e}s de
duas metodologias diferentes: uma baseada na forma linear e a
outra na forma exponencial de descrever esse fen{\^o}meno.
Observou-se que as duas formas de corrigir os dados s{\~a}o
igualmente eficientes. Al{\'e}m disso, verificou-se que a
execu{\c{c}}{\~a}o dessa corre{\c{c}}{\~a}o {\'e} fundamental
para melhor obten{\c{c}}{\~a}o do perfil da varia{\c{c}}{\~a}o
diurna relacionada ao transporte dos raios c{\'o}smicos no meio
interplanet{\'a}rio. A partir da an{\'a}lise da
varia{\c{c}}{\~a}o diurna em diferentes per{\'{\i}}odos do
ciclo solar, verificou-se que sua amplitude possui uma boa
rela{\c{c}}{\~a}o com o n{\'u}mero de manchas solares, enquanto
que sua fase n{\~a}o exibiu nenhuma caracter{\'{\i}}stica
conclusiva. Por fim, ao comparar a varia{\c{c}}{\~a}o diurna
observada em per{\'{\i}}odos calmos com aquela observada em
per{\'{\i}}odos perturbados, notou-se que a amplitude associada
{\`a} passagem de feixes de vento solar r{\'a}pido {\'e} maior
do que a obtida em per{\'{\i}}odos calmos, principalmente, no
dia anterior {\`a} chegada do feixe. Al{\'e}m disso, observou-se
que o processo de convec{\c{c}}{\~a}o {\'e} mais significativo
durante e ap{\'o}s o aumento de velocidade do vento solar.
ABSTRACT: Cosmic rays are high energy charged particles of
extra-galactical, galatical or solar origin. In the Heliosphere,
the transport of these particles is influenced by (transient and
recurrent) solar phenomena. Among the temporal variations of
cosmic ray intensity observed at Earth, this work is focused on
the diurnal variation, which is characterized by a periodic
behavior with maximum value between 12 and 18 hours LT (local
time) mainly caused by the diffusion and convection processes of
cosmic ray particles in the interplanetary medium. Precisely, the
main objective of this work is to study the changes in the diurnal
variation (amplitude and phase) during different periods of the
solar cycle (between years 2007 and 2015) and including periods
disturbed by the arrival of high speed solar wind streams. For
that, we used data from: The S{\~a}o Martinho da Serra (SMS)
multidirectional muon detector (Southern Space Observatory-
SSO/CRC/INPE), the Global Data Assimilation System (GDAS) and the
ACE satellite. Initially, problems in the SMS detector data
related to electronic issues on this detector were identified and
eliminated or corrected. After that, we analyzed the influences
associated with the atmospheric temperature and atmospheric
pressure through two different methodologies: based in a linear
and an exponential description of this phenomenon. We found that
both presented similar results. Besides that, we confirmed that
the elimination of atmospheric influences is fundamental to get
the diurnal variation profile related to the transport of cosmic
ray particles in the interplanetary medium. From the analysis of
the diurnal variation in different solar cycle periods, we
observed that there is a relationship between the behave of the
sunspot number and the amplitude of the diurnal variation. On the
other hand, the analysis of the phase of this variation did not
exhibit any conclusive characteristics. Finally, comparing the
diurnal variation observed in calm periods with that seen in
periods disturbed very likely by the arrival of high-speed solar
wind streams, we observed a higher amplitude of the diurnal
variation on disturbed periods, mainly on the day before the
stream arrival. Moreover, we infered that the convection process
is more significant during and after the increase of the solar
wind velocity corroborating the theory.",
committee = "Alves, Maria Virg{\'{\i}}nia (presidente) and Lago, Alisson Dal
(orientador) and Mendon{\c{c}}a, Rafael Rodrigues Souza de
(orientador) and C{\^a}ndido, Cl{\'a}udia Maria Nicoli and
Raulin, Jean Pierre",
englishtitle = "Study of the influence of high-speed solar wind streams on the
diurnal variation of the intensity of cosmic rays",
language = "pt",
pages = "121",
ibi = "8JMKD3MGP3W34P/3NRNC4S",
url = "http://urlib.net/ibi/8JMKD3MGP3W34P/3NRNC4S",
targetfile = "publicacao.pdf",
urlaccessdate = "27 abr. 2024"
}