@Article{MoroDenResCheSch:2016:InUnEm,
author = "Moro, Juliano and Denardini, Clezio Marcos and Resende, Laysa
Cristina Ara{\'u}jo and Chen, Sony Su and Schuch, Nelson Jorge",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)}",
title = "Influence of uncertainties of the empirical models for inferring
the E-region electric fields at the dip equator",
journal = "Earth, Planets and Space",
year = "2016",
volume = "68",
number = "103",
pages = "1--15",
keywords = "Space weather, Equatorial aeronomy, E-region electric fields,
Empirical models.",
abstract = "Daytime E-region electric fields play a crucial role in the
ionospheric dynamics at the geomagnetic dip latitudes. Due to
their importance, there is an interest in accurately measuring and
modeling the electric fields for both climatological and near
real-time studies. In this work, we present the daytime vertical
(Ez) and eastward (Ey) electric fields for a reference quiet day
(February 7, 2001) at the S{\~a}o Lu{\'{\i}}s Space
Observatory, Brazil (SLZ, 2.31°S, 44.16°W). The component Ez is
inferred from Doppler shifts of type II echoes (gradient drift
instability) and the anisotropic factor, which is computed from
ion and electron gyro frequencies as well as ion and electron
collision frequencies with neutral molecules. The component Ey
depends on the ratio of Hall and Pedersen conductivities and Ez. A
magnetic field-line-integrated conductivity model is used to
obtain the anisotropic factor for calculating Ez and the
ionospheric conductivities for calculating Ey. This model uses the
NRLMSISE-00, IRI-2007, and IGRF-11 empirical models as input
parameters for neutral atmosphere, ionosphere, and geomagnetic
field, respectively. Consequently, it is worth determining the
uncertainties (or errors) in Ey and Ez associated with these
empirical model outputs in order to precisely define the
confidence limit for the estimated electric field components. For
this purpose, errors of ±10 % were artificially introduced in the
magnitude of each empirical model output before estimating Ey and
Ez. The corresponding uncertainties in the ionospheric
conductivity and electric field are evaluated considering the
individual and cumulative contribution of the artificial errors.
The results show that the neutral densities and temperature may be
responsible for the largest changes in Ey and Ez, followed by
changes in the geomagnetic field intensity and electron and ions
compositions.",
doi = "10.1186/s40623-016-0479-0",
url = "http://dx.doi.org/10.1186/s40623-016-0479-0",
issn = "1343-8832",
label = "lattes: 0549130828972280 5 MoroDenResCheSch:2016:InUnEm",
language = "en",
targetfile = "moro_influence.pdf",
urlaccessdate = "27 abr. 2024"
}