A5059489963- Lightning and Electromagnetic Phenomena
- Electrical Fault Detection and Protection
- Fire effects on ecosystems
- Thermal Analysis in Power Transmission
- Ionosphere and magnetosphere dynamics
- Electromagnetic Compatibility and Noise Suppression
- High voltage insulation and dielectric phenomena
- Antibiotic Use and Resistance
- Astrophysics and Cosmic Phenomena
- Optical Systems and Laser Technology
- Healthcare Regulation
- Plant responses to water stress
- Advanced Optical Sensing Technologies
- Tree Root and Stability Studies
- Magnetic Field Sensors Techniques
- Public Health in Brazil
- Atmospheric aerosols and clouds
- Earthquake Detection and Analysis
Federal Center for Technological Education of Minas Gerais
2018-2024
Universidade Federal de Minas Gerais
2010-2020
Abstract Terrestrial Gamma-ray Flashes (TGFs) are intense bursts of gamma rays originating from the Earth’s atmosphere, primarily produced by lightning flashes through relativistic runaway electron avalanches. Observations Telescope Array in Utah, equipped with a variety detection instruments, have revealed detailed insights into TGF initiation and propagation, including their optical emissions. High-speed video cameras spectroscopic systems captured emissions linked to TGFs, revealing key...
Abstract Records of M‐component currents first return strokes in natural negative cloud‐to‐ground lightning measured a short instrumented tower are shown along with correlated video records, electric field changes, and relative luminosity. The synchronized fast‐camera records clearly match the increase luminosity faint channel. parameters these M components all consistent those triggered lightning. According to change events near Morro do Cachimbo Station at tower, frequency exhibiting is...
Experimental tests, consisting in the impression of low amplitude impulsive currents with lightning-patterned waveforms on a real grounding grid, were performed to assess grid transient response. Simultaneous waves current and potential rise measured considering different points along electrodes (earth termination) determine impedance. Currents very short front-times used show strong propagation effects soil, responsible for values impedance always significantly larger than frequency...
Some data of currents lightning events measured in Morro do Cachimbo Station during the period 2008–2012 are presented, comprising 9 downward negative first strokes (4 them pertaining to multiple-stroke flashes), 8 unconnected upward leaders developed response approaching ground and 5 lightning. The current waves all presented along with an example representative for stroke leader currents. Parameters such summarized.
The experimental and simulated responses of a grounding grid, comprising 20 4-m-×-4-m meshes buried in 160-Ωm soil, subjected to currents with lightning-patterned waveforms were determined. Simulations considered assumptions constant frequency dependent soil resistivity permittivity. amplitude waveform the measured potential rise quite similar and, due low value resistivity, dependence parameters practically did not affect results.
Some parameters of the current waveforms several negative flashes measured recently at Morro do Cachimbo Station were considered in relation to values provided by a statistical evaluation developed previously for data 13-years period acquisition there. The impact these recent median peak-current, front-times and time-to-half-peak-current was evaluated.
This paper presents the fundamental aspects of low-cost measuring systems developed for recording current waveforms lightning flashes by using two different principles. Such principles are based on non-direct and direct measurement, performed a loop antenna Rogowski coil, respectively. A Digital Signal Processor (DSP) supports data acquisition. Accurate parameters, such as peak time parameters return stroke currents, can be promptly determined from records. The include means remote internet...
This article describes the features of a device developed for measurement and recording waveforms first return stroke currents lightning flashes striking tall grounded structures. The operation this is based on detection voltage induced along loop by fast-varying magnetic field produced current flowing structure close to device. A digital signal processor supports data acquisition. includes means remote internet access, self-test, transfer. Preliminary laboratory tests consisting impulsive...