@MastersThesis{Picanço:2019:DeAnÍn,
author = "Pican{\c{c}}o, Giorgio Arlan da Silva",
title = "Desenvolvimento e an{\'a}lise de um {\'{\i}}ndice
ionosf{\'e}rico baseado em dados de Conte{\'u}do Eletr{\^o}nico
Total",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2019",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2019-03-28",
keywords = "Ionosfera terrestre, DIX, perturba{\c{c}}{\~o}es
ionosf{\'e}ricas, tempestades geomagn{\'e}ticas, bolhas de
plasma, Earth's ionosphere, DIX, ionospheric disturbances,
geomagnetic storms, plasma bubbles.",
abstract = "Neste trabalho, apresenta-se um estudo sobre o desenvolvimento e a
an{\'a}lise de um {\'{\i}}ndice ionosf{\'e}rico baseado em
dados de Conte{\'u}do Eletr{\^o}nico Total (TEC), denominado
{\'{\i}}ndice local de perturba{\c{c}}{\~o}es
ionosf{\'e}ricas (LDIX). Para auxiliar esta pesquisa,
estudaram-se as perturba{\c{c}}{\~o}es ionosf{\'e}ricas
observadas durante per{\'{\i}}odos geomagneticamente calmos e
perturbados. Para isso, foram analisados dez per{\'{\i}}odos
espec{\'{\i}}ficos do ano de 2015, sendo cinco para cada
condi{\c{c}}{\~a}o geomagn{\'e}tica. O {\'{\i}}ndice LDIX foi
calculado ao longo de todos esses per{\'{\i}}odos e os
resultados obtidos foram comparados com diversos par{\^a}metros
ionosf{\'e}ricos e magn{\'e}ticos conhecidos e consolidados na
literatura, tais como o foF2, o hF e o \ΔH. Na an{\'a}lise
comparativa, tamb{\'e}m foram utilizados os {\'{\i}}ndices
geomagn{\'e}ticos Kp, AE e Dst, assim como outros par{\^a}metros
dos ionogramas, mapas de TEC e o {\'{\i}}ndice ionosf{\'e}rico
DIX. As varia{\c{c}}{\~o}es dos per{\'{\i}}odos
geomagneticamente perturbados foram analisadas de acordo com os
processos f{\'{\i}}sicos que ocorrem durante tempestades
geomagn{\'e}ticas (e.g. penetra{\c{c}}{\~a}o de campos
el{\'e}tricos, d{\'{\i}}namo perturbado). Adicionalmente, as
varia{\c{c}}{\~o}es observadas durante os per{\'{\i}}odos
geomagneticamente calmos foram analisadas de acordo com os
processos ionosf{\'e}ricos de origem interna (e.g. bolhas de
plasma, din{\^a}mica da atmosfera). No intuito de qualificar o
resultado do novo {\'{\i}}ndice quanto {\`a} forma de
c{\'a}lculo do TEC que leva ao LDIX, foi verificada a
diferen{\c{c}}a entre os valores de LDIX calculados a partir do
TEC obtido dos TECMAPs do Programa Embrace/INPE e o TEC obtido
diretamente de dados de GNSS, sendo esta diferen{\c{c}}a
m{\'e}dia estimada em ~7,8%. Essa an{\'a}lise revelou que
n{\~a}o h{\'a} diverg{\^e}ncias significativas entre as formas
de c{\'a}lculo do LDIX. Quanto aos demais resultados,
verificou-se que os {\'{\i}}ndices LDIX e DIX apresentaram
pequenas discrep{\^a}ncias pontuais na aus{\^e}ncia de
varia{\c{c}}{\~o}es ionosf{\'e}ricas de grande amplitude. Outro
ponto relevante observado foram as limita{\c{c}}{\~o}es que o
{\'{\i}}ndice DIX apresentou quanto {\`a} detec{\c{c}}{\~a}o
de perturba{\c{c}}{\~o}es ionosf{\'e}ricas de car{\'a}ter
diurno. Em contrapartida, o {\'{\i}}ndice LDIX foi capaz de
detectar tais perturba{\c{c}}{\~o}es, variando seu valor de
forma gradativa. Verificou-se, ainda que o {\'{\i}}ndice DIX
apresentou discord{\^a}ncias com rela{\c{c}}{\~a}o ao LDIX,
indicando perturba{\c{c}}{\~o}es inexistentes no TEC. Essas
varia{\c{c}}{\~o}es foram classificadas como falsos positivos
nas an{\'a}lises deste trabalho. Adicionalmente, verificou-se uma
forte rela{\c{c}}{\~a}o entre os processos f{\'{\i}}sicos
observados no par{\^a}metro foF2 e as perturba{\c{c}}{\~o}es
observadas no LDIX, o que constata a signific{\^a}ncia
f{\'{\i}}sica do LDIX. Nesse contexto, o LDIX mostrou-se
superior ao {\'{\i}}ndice DIX, visto que este n{\~a}o
apresentou a mesma similaridade f{\'{\i}}sica com
rela{\c{c}}{\~a}o ao par{\^a}metro foF2. Finalmente,
verificou-se que o {\'{\i}}ndice LDIX {\'e} capaz de detectar
as respostas ionosf{\'e}ricas da ocorr{\^e}ncia de campos
el{\'e}tricos do tipo overshielding, campos el{\'e}tricos do
d{\'{\i}}namo perturbado (DDEF) e de bolhas de plasma de forma
localizada. ABSTRACT: The present manuscript presents a study of
the development and the analysis of an ionospheric index based on
Total Electron Content (TEC) data, named Local Disturbance
Ionosphere indeX (LDIX). In order to support such development,
ionospheric disturbances observed during geomagnetically quiet and
disturbed periods were studied. Thus, ten periods on 2015 were
selected and analyzed, five of them to each geomagnetic condition.
Therefore, the LDIX was calculated during these periods and the
results were compared with several ionospheric and magnetic known
stablished parameters, such as foF2, h'F and \ΔH. In the
comparative analysis, geomagnetic indices Kp, AE and Dst were also
used, as well as others ionogram parameters, TEC maps and the DIX.
The index variations during geomagnetically disturbed periods were
analyzed according to the driving physical processes ruling during
geomagnetic storms (e.g., electric field penetration, ionospheric
disturbance dynamo). On the other hand, LDIX variations observed
during the geomagnetically quiet periods were analyzed in terms of
the ionospheric processes of internal origin (e.g., plasma
bubbles, atmospheric dynamics). In order to qualify the results of
the new ionospheric index as to the calculation of the TEC that
leads to the LDIX, we also verified a difference of 7.8% between
the values of LDIX calculated from the TEC as they are obtained
from the TECMAPs of the Embrace/INPE Program and the TEC obtained
directly from GNSS data. With regard to the other results, it was
observed that LDIX and DIX indices showed small discrepancies in
the absence of ionospheric variations of high-amplitude. Another
relevant point observed were the limitations that the DIX index
presented concerning the detection of daytime ionospheric
disturbances. In contrast, the LDIX index was able to detect such
disturbances, varying its value in a gradual way. It was also
verified that the DIX presented disagreements to the LDIX,
indicating non-existent TEC disturbances. These variations were
classified as false positives results in the analysis. In
addition, a strong relationship was observed between the physical
processes observed in the foF2 parameter and the disturbances
observed in the LDIX, which confirms the LDIX physical
significance. Thus, the LDIX index showed to be superior to DIX,
since it did not present the same physical similarity observed in
LDIX with respect to the foF2 parameter. Finally, it was verified
that the LDIX index is able to detect ionospheric responses due
overshielding electric fields, Disturbance Dynamo Electric Fields
(DDEF) and plasma bubbles in a localized way.",
committee = "Wrasse, Cristiano Max (presidente) and DeNardin, Clezio Marcos
(orientador) and Nogueira, Paulo Alexandre Bronzato (orientador)
and Takahashi, Hisao and Mendes J{\'u}nior, Odim",
englishtitle = "Development and analysis of an ionospheric index based on TEC
data",
language = "pt",
pages = "188",
ibi = "8JMKD3MGP3W34R/3ST7PHB",
url = "http://urlib.net/ibi/8JMKD3MGP3W34R/3ST7PHB",
targetfile = "publicacao.pdf",
urlaccessdate = "27 abr. 2024"
}