@PhDThesis{Ely:2016:MoVeNe,
author = "Ely, Cl{\'a}udia Vogel",
title = "Modelagem de ventos neutros termosf{\'e}ricos para o
territ{\'o}rio brasileiro por meio de simula{\c{c}}{\~a}o
num{\'e}rica",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2016",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2016-05-30",
keywords = "aeronomia, eletrodin{\^a}mica ionosf{\'e}rica, modelagem
semi-emp{\'{\i}}rica, ventos neutros termosf{\'e}ricos, baixa
latitude, aeronomy, ionospheric electrodynamics, semi-empirical
modelling, thermospheric neutral winds, low latitude.",
abstract = "Os ventos neutros termosf{\'e}ricos s{\~a}o respons{\'a}veis
por boa parte das incertezas relacionadas em trabalhos
ionosf{\'e}ricos pois apresentam significativas mudan{\c{c}}as
de dia a dia, n{\~a}o s{\~a}o previstos com facilidade e
tampouco t{\^e}m boa distribui{\c{c}}{\~a}o espacial e temporal
de medidas. Al{\'e}m disso, os modelos de ventos neutros atuais
dispon{\'{\i}}veis, frequentemente, falham em reproduzir as
condi{\c{c}}{\~o}es reais da ionosfera, em especial para a
regi{\~a}o brasileira. Neste trabalho, o comportamento dos ventos
neutros termosf{\'e}ricos {\'e} modelado sobre o territ{\'o}rio
brasileiro, a partir de dados obtidos durante a campanha COPEX. Os
par{\^a}metros utilizados s{\~a}o as derivas verticais de
plasma, a altura da camada F2 e a densidade de plasma obtidos por
meio de observa{\c{c}}{\~o}es sincronizadas de tr{\^e}s
ionossondas digitais instaladas nas localidades de Boa Vista
(2,8\$^{o}\$ N, 60,7\$^{o}\$ O), Cachimbo (9,8\$^{o}\$ S e
54,8\$^{o}\$ O) e Campo Grande (20,5\$^{o}\$ S, 54,7\$^{o}\$
O). O modelo obtido permite examinar os efeitos dos ventos neutros
na ionosfera em ambos hemisf{\'e}rios quando s{\~a}o comparadas
as derivais verticais de plasma obtidas com aquelas observadas nos
pontos conjugados magneticamente, nominalmente, Boa Vista e Campo
Grande. As observa{\c{c}}{\~o}es t{\^e}m mostrado que existe
assimetria na deriva vertical de plasma entre estas localidades e
o modelo busca simular estas assimetrias. O modelo de vento neutro
deste trabalho {\'e} obtido por solu{\c{c}}{\~a}o num{\'e}rica
das equa{\c{c}}{\~o}es diferenciais para as componentes zonal e
meridional dos ventos termosf{\'e}ricos. Os resultados
num{\'e}ricos dos ventos s{\~a}o comparados com sa{\'{\i}}das
do modelo semi-emp{\'{\i}}rico global de ventos horizontais, o
HWM, e a partir deles s{\~a}o calculadas novas derivas de plasma
via solu{\c{c}}{\~a}o da equa{\c{c}}{\~a}o de movimento dos
{\'{\i}}ons em estado estacion{\'a}rio. Estas derivas
resultantes s{\~a}o usadas para avaliar a din{\^a}mica do plasma
sobre as esta{\c{c}}{\~o}es ionosf{\'e}ricas utilizadas. O
presente estudo demonstra a grande import{\^a}ncia dos ventos
neutros na compreens{\~a}o do comportamento da deriva vertical de
plasma durante per{\'{\i}}odos geomagneticamente calmos.
Al{\'e}m disso, o modelo poder{\'a} ajudar a preencher a lacuna
em termos do conhecimento que existe a respeito do comportamento
dos ventos neutros sobre a regi{\~a}o brasileira. ABSTRACT: The
termospheric neutral winds are responsible for much of the
uncertainties related in ionospheric works because they present
significant changes from day to day, they are not easily predicted
nor have good spatial and temporal measures distribution. In
addition, current neutral wind models available often fail to
reproduce the actual conditions of the ionosphere, in particular
for the Brazilian region. In this work, the behavior of
thermospheric neutral winds is modeled on the Brazilian territory
from data obtained during COPEX campaign. The parameters used are
the vertical plasma drift, the height of the F2 layer and the
plasma density obtained by observations from three synchronized
digital ionosonde installed on Boa Vista (2.8\$^{o}\$ N,
60.7\$^{o}\$ W), Cachimbo (9.8\$^{o}\$ S and 54.8\$^{o}\$ W)
and Campo Grande (20.5\$^{o}\$ S, 54.7\$^{o}\$ W). The model
obtained allows to examine the effects of neutral winds in the
ionosphere in both hemispheres when vertical plasma drifts
obtained are compared with those observed in the magnetically
conjugate points, namely, Boa Vista and Campo Grande. The
observations have shown that there is asymmetry in the plasma
vertical drift between the locations and the model tries to
simulate these asymmetries. The neutral wind model of this work is
obtained by numerical solution of differential equations for the
zonal and meridional components of thermospheric winds. The
numerical results of the winds are compared with outputs of the
semi-empirical Horizontal Wind Model, the HWM, and from them are
calculated new plasma drifts through the solution of ion motion
equation in steady state. These resulting drifts are used to
assess the dynamics of the plasma of the ionospheric stations
used. This study demonstrates the importance of the neutral winds
in understanding the behavior of the plasma vertical drift during
quiet geomagnetic conditions. In addition, the model can help fill
the gap in knowledge that exists regarding the behavior of the
neutral winds on the Brazilian region.",
committee = "Dal Lago, Alisson (presidente) and Batista, Inez Staciarini
(orientadora) and Carrasco, Alexander Jos{\'e} (orientador) and
Nardin, Clezio Marcos de and Dutra, Severino Luiz Guimar{\~a}es
and Nogueira, Paulo Alexandre Bronzato and Fagundes, Paulo
Roberto",
copyholder = "SID/SCD",
englishtitle = "Thermospheric neutral wind modelling for the brazilian sector via
numerical simulation",
language = "pt",
pages = "184",
ibi = "8JMKD3MGP3W34P/3LPFGM8",
url = "http://urlib.net/ibi/8JMKD3MGP3W34P/3LPFGM8",
targetfile = "publicacao.pdf",
urlaccessdate = "27 abr. 2024"
}