A5085093227- Geophysical and Geoelectrical Methods
- Seismic Waves and Analysis
- Geochemistry and Geologic Mapping
- Earthquake Detection and Analysis
- Geomagnetism and Paleomagnetism Studies
- Geological and Geophysical Studies
- Ionosphere and magnetosphere dynamics
- Geophysical Methods and Applications
- Geography and Environmental Studies
- Geological and Geochemical Analysis
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Lightning and Electromagnetic Phenomena
- GNSS positioning and interference
- Seismic Imaging and Inversion Techniques
- Thermal Analysis in Power Transmission
- earthquake and tectonic studies
- Magnetic Field Sensors Techniques
- Computational Physics and Python Applications
- Fish biology, ecology, and behavior
- Groundwater and Watershed Analysis
- Geological formations and processes
- Hydrocarbon exploration and reservoir analysis
- Optimal Power Flow Distribution
- Reservoir Engineering and Simulation Methods
National Institute for Space Research
2013-2023
Valongo Observatory
2022
National Observatory
2022
Brazilian Institute of Geography and Statistics
2019
Universidade Estadual Paulista (Unesp)
2003-2005
Sociedade Brasileira de Geofísica
2004
Kyushu University
2003
Geomagnetically induced currents (GICs) are a ground end manifestation of space weather processes. During large geomagnetic storms, GICs flow between the grounding points power transformers and along electric transmission lines connecting transformers. In high‐latitude regions, damages to reported where storm time variations very rapid (>1000 nT), hence as or even greater than 100 A up flowing through windings At low latitudes, less severe, much smaller GIC values generally there....
Broadband and long-period magnetotelluric soundings were collected along a 560 km E–W profile in region of central Brazil subjected to Neoproterozoic collision tectonics Archean Cretaceous magmatic events. The crosses the northeastern portion Phanerozoic sediments volcanics Paraná basin, southern extension metasedimentary rocks Brasília belt, locally pervaded by alkaline magmas Alto Paranaíba igneous province (APIP), sedimentary cover exposed basement São Francisco craton. 2D conductivity...
Research Article| January 01, 2014 Electromagnetic constraints for subduction zones beneath the northwest Borborema province: Evidence Neoproterozoic island arc–continent collision in northeast Brazil Antonio L. Padilha; Padilha 1Instituto Nacional de Pesquisas Espaciais—INPE, C.P. 515, 12201-970 São José dos Campos, Search other works by this author on: GSW Google Scholar Ícaro Vitorello; Vitorello Marcelo B. Pádua; Pádua Maurício S. Bologna 2Departamento Geofísica, Universidade...
Magnetotelluric (MT) soundings were carried out in the period range of 20 to 6000 s along profiles roughly orthogonal Campos do Jordão Railway (CJRW), Brazilian southeastern region. The located over two adjacent regions with contrasting conductivity, conductive sedimentary region Taubaté Basin and resistive crystalline Serra da Mantiqueira. railway operates DC current that produces an intense electromagnetic noise but only during diurnal periods, being turned off at night. objective this...
An array of 29 vector magnetometers was operated in N-NE Brazil from November 1990 until March 1991. We present the analysis 16 selected quiet days, for which a simple model an equivalent current distribution Sq and EEJ, fits observed maximum amplitude daily variation at midday. In equatorial regions precise latitude profile field is masked by EEJ. This uncertainty resolved assuming that obtained after subtracting ranges, should ratio 0.3 westward to eastward current. With this constraint,...
Abstract A large‐scale array of long‐period magnetic data and a deep‐probing magnetotelluric profile were recorded in the intracratonic Paraná sedimentary basin central eastern South America, which presents thick extensive sedimentary‐magmatic sequence that allows its basement to be investigated only by indirect methods. Integration results from both methods showed crust beneath several quasi‐linear highly conductive channeled zones with limited lateral extent, coincidence some main tectonic...
Abstract The present work is the first of a two‐part paper on Embrace Magnetometer Network. In this part, we new Network (Embrace MagNet) in South America, which originally planned to cover most eastern portion Southern America longitudinal sector by installing and operating fluxgate magnetometer stations. We discuss purpose scientific goals network, associated with aeronomy space weather. provide details instrumentation, location sensors, sensitivity matching process, gain installation....
About 1.1 million cloud‐to‐ground lightning flashes were recorded by a positioning and tracking system in southeastern Brazil 1993. The 1‐year continuous data set is the first obtained Brazil. It has been analyzed for geographical distribution of total flash density, percentage positive flashes, negative densities, peak currents. dependence density current on latitude, altitude, soil resistivity was investigated. Negative found to be inversely correlated with but no other significant...
Abstract Geomagnetic field variations recorded by fluxgate magnetometers are used to evaluate geomagnetically induced currents (GICs) under the equatorial electrojet (EEJ) and South Atlantic Magnetic Anomaly (SAMA) during two geomagnetic storms in March June 2015. stations with information about underground electrical conductivity structure that can be approximated unidimensional (1‐D) models for calculation of geoelectric selected. GICs levels estimated using a realistic local power grid...
We discovered and mapped a 1200 km‐long zone of enhanced electrical conductivity through large array magnetometers, over narrow corridor parallel to the Paraguay Araguaia belts which surround Amazon craton. The anomaly has been further studied using magnetotelluric measurements made along 300 km profile crossing belt; modeling shows at this location as very strong 100 km‐wide upper‐crust mid‐crust conductor, located under region where surficial rocks show an increase in deformation...
Abstract Geomagnetically induced currents (GICs) result from the interaction of time variation ground magnetic field during a geomagnetic disturbance with Earth's deep electrical resistivity structure. In this study, we simulate GICs in hypothetical representation low‐latitude power transmission network located mainly over large Paleozoic Paraná basin (PB) southern Brazil. Two intense storms June and December 2015 are chosen geoelectric fields calculated by convolving three‐dimensional (3‐D)...
Analysis of the globally coherent Pc5 geomagnetic pulsation event March 24, 1991, from a chain stations extending auroral oval to equatorial region along American sector, has shown unequivocal evidence on enhancement amplitude in narrow band centered at dip equator. The fine spatial structure this enhancement, documented observationally for first time, emphasizes importance an ionospheric component associated with enhanced Cowling conductivity. presence is also indicated mid‐latitudes by...
Abstract The present work is the second of a two‐part paper on Embrace Magnetometer Network. In this part, we provide some first scientific findings that have already achieved with network. We identified diurnal and seasonal natural variations H component. provided precise determination sudden storm commencements impulse. showed Δ amplitudes derived from MagNet during intense magnetic are in very good agreement Dst index. it possible to investigate effects solar quiet ionospheric current...
We present a magnetotelluric (MT) study in the northeastern part of São Francisco Craton that encompasses an Archean-Proterozoic terrain, Serrinha Block, breached by rift basin developed mostly Early Cretaceous times during opening South Atlantic Ocean. Even though MT sites are regularly spaced, profiles have different orientations from one another, making data distribution over area highly uneven and therefore non-ideal for 3-D modeling. However, set is very complex, with dimensionality...
ABSTRACT. In this paper we present the first steps given towards development of South American K index (Ksa) based on measurements made by Embrace Magnetometer Network. We present: (a) a description magnetometer and network; (b) procedure used to calibrate network equipments; (c) obtain each station scale its corresponding upper limits ranges for three-hour-range (thereafter referred as K9 threshold); (d) some particularities regarding Quiet Day Curve (QDC) deviation long term...