@PhDThesis{Schmitz:2020:MeEnTr,
author = "Schmitz, Roberta Gon{\c{c}}alves",
title = "Mecanismos envolvidos em transfer{\^e}ncia de energia em
reconex{\~a}o magn{\'e}tica sim{\'e}trica e assim{\'e}trica
via simula{\c{c}}{\~o}es por part{\'{\i}}culas",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2020",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2020-05-21",
keywords = "reconex{\~a}o de campo magn{\'e}tico, magnetosfera terrestre,
t{\'e}cnica de part{\'{\i}}cula em c{\'e}lula, plasmas
espaciais, magnetic field reconnection, earth magnetosphere,
particle in cell technique, space plasmas.",
abstract = "Nesta tese foram tratados alguns cen{\'a}rios poss{\'{\i}}veis
de reconex{\~a}o magn{\'e}tica na magnetosfera terrestre. A
partir dos resultados obtidos usando simula{\c{c}}{\~o}es por
part{\'{\i}}culas com o c{\'o}digo iPIC3D, foram analisadas as
regi{\~o}es de difus{\~a}o dos {\'{\i}}ons e dos
el{\'e}trons, a forma{\c{c}}{\~a}o de frentes de reconex{\~a}o
e os principais mecanismos de convers{\~a}o de energia que
ocorrem na regi{\~a}o de dissipa{\c{c}}{\~a}o e nas frentes de
reconex{\~a}o, bem como a taxa de reconex{\~a}o nos diferentes
cen{\'a}rios. O processo de reconex{\~a}o magn{\'e}tica pode
ser classificado em dois tipos: sim{\'e}trico (RMS) e
assim{\'e}trico (RMA), dependendo das configura{\c{c}}{\~o}es
de campo magn{\'e}tico, densidade, temperatura e velocidade das
part{\'{\i}}culas nos dois regimes de plasma envolvidos. Na
magnetosfera terrestre, a RMS ocorre mais frequentemente na
regi{\~a}o da cauda magn{\'e}tica, onde tanto os campos
magn{\'e}ticos quanto as densidades dos l{\'o}bulos norte e sul
s{\~a}o da mesma ordem de intensidade. Na magnetopausa o processo
mais comum {\'e} a RMA, que ocorre frequentemente quando as
intensidades de campo magn{\'e}tico e/ou densidade da
magnetosfera s{\~a}o significantemente diferentes dos valores da
bainha magn{\'e}tica. RMS e RMA possuem assinaturas
caracter{\'{\i}}sticas e t{\^e}m sido bastante estudadas
atrav{\'e}s de observa{\c{c}}{\~o}es de sat{\'e}lites e de
simula{\c{c}}{\~o}es. Por exemplo, em RMS o campo magn{\'e}tico
perpendicular ao plano de reconex{\~a}o magn{\'e}tica, conhecido
como campo magn{\'e}tico Hall, apresenta um comportamento
quadrupolar devido ao movimento relativo entre os {\'{\i}}ons e
el{\'e}trons. J{\'a} no caso de RMA o campo magn{\'e}tico Hall
possui um aspecto bipolar. Neste trabalho foram apresentados
resultados de simula{\c{c}}{\~o}es de RMS e RMA, com {\^e}nfase
em um caso em particular em que foi encontrado padr{\~a}o
quadrupolar do campo magn{\'e}tico Hall em
observa{\c{c}}{\~o}es de RMA. Nossas simula{\c{c}}{\~o}es
mostraram que as assimetrias presentes n{\~a}o foram suficientes
para apresentar assinaturas de RMA neste caso. A an{\'a}lise de
convers{\~a}o de energia para RMS mostra que a energia
eletromagn{\'e}tica {\'e} em grande parte convertida para
{\'{\i}}ons nas frentes de reconex{\~a}o, o que n{\~a}o
ocorreu no caso RMA, j{\'a} que a convers{\~a}o de energia neste
caso ficou restrita {\`a} regi{\~a}o das separatrizes do lado
que possui campo magn{\'e}tico mais intenso. ABSTRACT: In this
thesis some possible scenarios of magnetic reconnection in the
terrestrial magnetosphere were treated. From the results obtained
using particle simulations with the iPIC3D code, the ion and
electron diffusion regions, the formation of reconnection fronts
(RF) and the main energy conversion mechanisms that occur in the
dissipation region and in the RFs were analyzed, as the
reconnection rate in different scenarios. The magnetic
reconnection process can be classified into two types: symmetric
(SMR) and asymmetric (AMR), depending on the settings of the
magnetic field, density, temperature and velocity of the particles
in the two plasma regimes involved. In the terrestrial
magnetosphere, SMR occurs more frequently in the magnetotail
region, where both the magnetic fields and the densities of the
northern and southern lobes are of the same order of intensity. At
the magnetopause the most common process is AMR, which occurs
quite frequently when the magnitude of magnetic field and/or the
density of the magnetosphere are significantly different than in
the magnetic sheath. SMR and AMR have characteristic signatures
and have been extensively studied through satellite observations
and simulations. For example, in SMR the magnetic field
perpendicular to the plane of magnetic reconnection, known as the
Hall magnetic field, presents a quadrupolar behavior due to the
relative movement between ions and electrons. In the case of ARM,
the Hall magnetic field has a bipolar aspect. In this thesis,
results of SMR and AMR simulations were presented, with emphasis
on a particular case in which a quadrupolar pattern of the Hall
magnetic field was found in AMR observations. Our simulations
showed that the asymmetries we have considered were not enough to
present AMR signatures. The energy conversion analysis for SMR
shows that the electromagnetic energy is largely converted to ions
in the reconnection fronts, which did not occur in the ARM case,
since the energy conversion in this case was restricted to the
separator region on the side that presents more intense magnetic
field.",
committee = "Dal Lago, Alisson (presidente) and Alves, Maria Virg{\'{\i}}nia
(orientadora) and Souza, Vitor Moura Cardoso e Silva and Batista,
Inez Staciarini and Silveira, Marcos Vinicius Dias and Rojas,
Fl{\'a}via Reis Cardoso",
englishtitle = "Mechanisms involved in energy transfer in symmetric and asymmetric
magnetic reconnection via particle simulations",
language = "pt",
pages = "119",
ibi = "8JMKD3MGP3W34R/42E9MNL",
url = "http://urlib.net/ibi/8JMKD3MGP3W34R/42E9MNL",
targetfile = "publicacao.pdf",
urlaccessdate = "09 maio 2024"
}