A5041741272- Lightning and Electromagnetic Phenomena
- Fire effects on ecosystems
- Ionosphere and magnetosphere dynamics
- Meteorological Phenomena and Simulations
- Electrical Fault Detection and Protection
- Ocular and Laser Science Research
- Power Line Communications and Noise
- Electrostatic Discharge in Electronics
- Advanced Optical Sensing Technologies
- Tropical and Extratropical Cyclones Research
- Earthquake Detection and Analysis
- Magneto-Optical Properties and Applications
- Atmospheric aerosols and clouds
- Electromagnetic Compatibility and Noise Suppression
- Thermal Analysis in Power Transmission
- Wind and Air Flow Studies
- Remote Sensing and LiDAR Applications
- High voltage insulation and dielectric phenomena
- Plant responses to elevated CO2
- Astrophysics and Cosmic Phenomena
- Electromagnetic Compatibility and Measurements
- Tree Root and Stability Studies
- Ocean Waves and Remote Sensing
- Plant responses to water stress
- Liver Disease and Transplantation
Universitat Politècnica de Catalunya
2016-2024
Universidad Nacional de Colombia
2011-2012
Universidad de Oviedo
2008
Hospital Materno-Infantil
2003
Lightning Mapping Array (LMA) networks detect very-high-frequency (VHF, 60–66 MHz) emissions from lightning channels inside clouds. This enables the mapping of in three dimensions. The use real-time LMA data has proven beneficial for forecasting and warning about impending severe weather. Beyond standard analysis cloud-to-ground information, ability to visualize 3D total provided forecasters with greater knowledge storm-scale processes.A network more than 20 stations been...
Abstract Lightning flashes were observed in Barrancabermeja (Colombia) by two photometers centered at 337 and 777 nm wavelengths, a high‐speed camera, the Colombia Mapping Array. Both optical VHF radio emissions of different lightning processes are investigated. Flash initiations upward in‐cloud breakdown present first short pulse followed period ∼1 kHz propagation. The ratio remains unity or below, associated with transition to negative horizontal leader In flash fast‐stepped downward...
Abstract Charge structure derived from lightning leader development of tropical thunderstorms comprising equatorial latitudes less than ±10° has not been investigated yet. In this work, using a mapping array installed in northern Colombia, the charge structure, initiations, and cloud‐to‐ground strokes rates two have analyzed. Additionally, radar information is also included. The identification regions obtained by analyzing propagation developments. Flashes initiate between 4‐ 15‐km altitude....
Abstract In 2002 it was discovered that a lightning discharge can rise out of the top tropical thunderstorms and branch spectacularly to base ionosphere at 90 km altitude. Several dozens such gigantic jets have been recorded or photographed since, but eluded capture by high-speed video cameras. Here we report on 4 in Colombia temporal resolution 200 µs 1 ms. During rising stage, one more luminous steps are revealed 32-40 km, before continuous final jump negative streamers ionosphere,...
Abstract The Atmosphere‐Space Interactions Monitor (ASIM) on the International Space Station (ISS) provides optical radiances and images of lightning flashes in several spectral bands. This work presents a flash simultaneously observed from space by ASIM, Geostationary Lightning Mapper (GLM) Imaging Sensor (ISS‐LIS); ground Colombia‐Lightning Mapping Array (Colombia‐LMA). Volumetric weather radar reflectivity data to help interpret effects cloud particles features. We found that surges...
Abstract Terrestrial Gamma‐ray Flashes (TGFs) are ten‐to‐hundreds of microsecond bursts gamma‐rays produced when electrons in strong electric fields thunderclouds accelerated to relativistic energies. Space instruments have observed TGFs with source photon brightness down ∼10 17 –10 16 . Based on space and aircraft observations, been considered rare phenomena association very few lightning discharges. observations associated ground the radio band indicated that there exists a population...
Abstract We analyze a nighttime negative cloud‐to‐ground lightning flash in Colombia observed from the ground with high‐speed camera at 5,000 images per second and space by Atmosphere‐Space Interactions Monitor (ASIM) on International Space Station (ISS), Lightning Imaging Sensor also ISS (ISS‐LIS), Geostationary Mapper (GLM) GOES‐16. The instruments measure oxygen band 777.4 nm, allowing for direct comparisons of measurements, ground‐based observes wide visible band. After conversion to...
Abstract This work presents the first observation of a multi‐stroke positive cloud‐to‐ground lightning flash sharing same channel to ground mapped with very high frequency broadband interferometer and Lightning Mapping Array. type is rarely observed, it currently unclear how frequent even under what conditions occurs. Our observations indicate scenario where downward leader initiates from decayed negative channel. After return stroke, some main branches stop propagating are likely cut off. A...
Information about lightning activity and its parameters is necessary to design evaluate the protection of an electrical power system. This information can be obtained from ground-based detection networks that provide on cloud-to-ground strikes with a location accuracy few hundred meters. Recently, first satellite-based optical detectors are operating continuously geostationary orbits. These imagers observe luminosity escaping clouds detect locate total spatial several kilometers. allows...
Liver transplantation (LT) is an established treatment for children with acute and chronic liver failure. Some reports suggest that infants under the age of 1 yr weighing 13 kg are high-risk groups associated less satisfactory results. This report describes our experience during pediatric intensive care unit stay 16 <7 who received LT. We reviewed records median 7.4 months weight 5.8 kg, 18 allografts, nine whole reduced. also use adrenergic agonist agents, anti-infectious antihypertensive...
This paper presents a methodology for thunderstorm warning alarming using electric field measurements and lightning location data under mountainous conditions in Medellín - Colombia. The is used to set criteria preventing human sensitive systems risks damages.
We investigate the initiation of four lightning flashes detected from ground by means Colombia Lightning Mapping Array (Colombia-LMA) and simultaneously observed space optical sensors Atmosphere-Space Interactions Monitor (ASIM) on board International Space Station (ISS), Geostationary Mapper (GLM), Imaging Sensor ISS. The initiations are characterized isolated predominant blue pulses (337.0 nm). In three flashes, red emissions (777.4 nm), a dominant line hot lightning, were not during their...
Abstract This work presents the first simultaneous X‐ray measurements from natural lightning in coincidence with a very high frequency (VHF) broadband interferometer. During an observational campaign north‐central Colombia, five intense bursts were detected negative stepped leaders and two emissions dart leader. Thanks to angular time resolution of interferometer, it was possible locate origin high‐energy radiation during leader propagation. We study correlation VHF pulses two‐dimensional...
Lightning activity on the Colombian mountains, where altitude varies from 0 to more than 5,000 MSL, is studied based VLF/LF lightning detection data and using a 2012–2013 dataset. The influence of evaluated by analyzing peak current distributions for cloud-to-ground strokes at different intervals studying relationship between ground flash density gradient vectors. Results show clear dependence elevation.
The first data set of VHF lightning mapping using a Lightning Mapping Array system - LMA in tropical region is presented this paper. Six sensors were installed at the north Colombia near Santa Marta city. Since installation network 2015, up to 7000 intra-cloud (IC) discharges from September November 2015 have been analyzed. suggests that, electrical charge distribution thunderstorms shows higher vertical development reaching altitudes compared temperate latitudes.
The lightning risk evaluation at countries with high ground flash densities and industries involving hazardous environments commonly doesn't satisfy the tolerable limits, according IEC62305-2, especially for human losses. This paper analyzes risks in Colombia how thunderstorm warning systems can be used to manage it. Real facilities episodes from 2012 2013 are studied.
Abstract The Atmosphere-Space Interactions Monitor (ASIM) on the International Space Station (ISS) includes an instrument designed to geolocate Terrestrial Gamma-ray Flashes (TGF) produced by thunderstorms. It does so with a coded aperture system shadowing pixelated Low Energy Detector of Modular X- and Sensor (MXGS). Additionally, it locates associated lightning flashes Multispectral Imaging Array (MMIA). Here we present 3 bright TGFs very similar duration, fluency observation distance....