Exploració per tema "lightning"

Ara es mostren els items 1-20 de 29

    • A closer look at lightning reveals needle-like structures 

      Williams, Earle R.; Montañá Puig, Juan (Macmillan Publishers, 2019-04-17)
      Article
      Accés obert
      Structural features have been identified on positively charged lightning channels that are not present on negatively charged ones. The discovery could explain why these two types of channel have different behaviours.

    • Aliasing of the Schumann resonance background signal by sprite-associated Q-bursts 

      Guha, Anirban; Williams, Earle R.; Boldi, Robert; Satori, Gabriella; Nagy, Tamás; Bór, József; Montañá Puig, Juan; Ortega, Pascal (2017-12)
      Article
      Accés obert
      The Earth's naturally occurring Schumann resonances (SR) are composed of a quasi-continuous background component and a larger-amplitude, short-duration transient component, otherwise called ‘Q-burst’ (Ogawa et al., 1967). ...

    • Analysis of five Gigantic Jets observed near Réunion Island with video and photographic cameras 

      Soula, Serge; Van der Velde, Oscar Arnoud; Montañá Puig, Juan; Huet, Patrice; Barthe, Christelle; Bor, Jozsef (Elsevier, 2011)
      Text en actes de congrés
      Accés obert
      Five gigantic jets (GJ) have been recorded by a camera on March 7th 2010, at a very closedistance above an isolated tropical storm east of Réunion Island. Three of them were produced within about 4 minutes before the storm ...

    • Analysis of the charge transferred by lightning during Catalonia (Spain) thunderstorms 

      Montañá Puig, Juan (2004)
      Comunicació de congrés
      Accés restringit per decisió de l'autor
      Knowledge of lightning parameters related to electrical atmospheric discharges are essential to predict the severity such as over voltages in power lines or other damages. Today the availability of statistical data ...

    • Comparison of global RHESSI and AGILE TGFs distributions and analysis of all AGILE satellite passes over South America. 2009-2012 period 

      Fabró Tàpia, Ferran; Montañá Puig, Juan; Marisaldi, Martino (2014)
      Text en actes de congrés
      Accés obert
      RHESSI and AGILE TGFs distributions in the period 2009-2012 are compared. Analysis of differences in geographical, hourly, monthly distributions of the three main TGF production regions in Earth due to differences in ...

    • Evolution of gigantic jets at high temporal and spatial resolution 

      Van der Velde, Oscar Arnoud; Montanya, Joan; López Trujillo, Jesús Alberto (2018)
      Comunicació de congrés
      Accés obert
      Gigantic Jets (GJ) are lightning discharges between the cloud and the lower ionosphere, which manifest as leaders at low altitude and transition to streamers as they rise in altitude. The evolution has never been imaged ...

    • First data of the Colombia Lightning Mapping Array - COLMA 

      López Trujillo, Jesús Alberto; Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Romero Durán, David; Aranguren Fino, Harby Daniel; Torres Sanchez, Horacio; Taborda, John; Martínez, Joaquin (Zakon Group, 2016)
      Text en actes de congrés
      Accés obert
      The first data set of VHF lightning mapping using a Lightning Mapping Array system - LMA in a tropical region is presented in this paper. Six sensors were installed at the north of Colombia near Santa Marta city. Since ...

    • Gravity waves, meteor trails and asymmetries in elves 

      Van der Velde, Oscar Arnoud; Montañá Puig, Juan; Fullekrug, Martin; Soula, Serge (Elsevier, 2011)
      Text en actes de congrés
      Accés obert
      From June 2008 to March 2011 more than 400 elves have been recorded by cameras in southern France and northeastern Spain. A considerable fraction of elves are not as uniform as predicted by theory. We demonstrate examples ...

    • High-resolution spectra of sprites and halos with GRASSP 

      Gordillo Vázquez, Francisco; Passas, Maria; Sánchez, Justo; Pérez Invernón, F. J.; Luque, Alejandro; Van der Velde, Oscar Arnoud; Montañá Puig, Juan (2017)
      Text en actes de congrés
      Accés obert
      The first and simultaneous spectroscopic campaigns of TLEs were carried out in the mid 1990s [1, 2], soon after the discovery of TLEs in 1989 [3]. These initial campaigns provided preliminary results on the optical emissions ...

    • Investigation of potential distribution on a CFRP coupon under impulse current: test results and FDTD simulation 

      Romero Durán, David; Rey Fernández, José Antonio; Montañá Puig, Juan; Horta Bernús, Ricard; Tobella, Guillem (Zakon Group, 2016)
      Text en actes de congrés
      Accés obert
      CFRP is becoming in an important material for the future blades due to alternative renewable energy industry plans to increase the length of the blades. This work shows some analytical results about potential distribution ...

    • Lightning flash properties derived from lightning mapping array data 

      Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Solà de las Fuentes, Glòria; Fabró Tàpia, Ferran; Romero Durán, David; Pineda Ruegg, Nicolau; Argemí Ribera, Oriol (2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      in this paper size and duration of lightning flashes are examined. Data from the Ebro Valley Laboratory Lightning Mapping Array is used as reference. Additional data from the VLF/LF LINET network and meteorological radar ...

    • Lightning interaction and damages to wind turbines 

      Montañá Puig, Juan (2016)
      Text en actes de congrés
      Accés obert
      Multi-megawatt wind turbines are a special type of tall structures. Two characteristics stand out from other tall objects such as buildings and telecommunication towers. The first particularity is that a large part of the ...

    • Lightning mapping observations of downward lightning flashes to wind turbines 

      Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Domingo Dalmau, Anna; Pineda Rüegg, Nicolau; Argemí Ribera, Oriol; Salvador Yuste, Albert (Zakon Group, 2016)
      Text en actes de congrés
      Accés obert
      Negative downward leaders that produced lightning strokes to wind turbines are identified by means of the Lightning Mapping Array data of the Ebro Valley Laboratory (NE Spain). Four cases are analyzed together with weather ...

    • Natural observatories for lightning research in Colombia 

      Aranguren Fino, Harby Daniel; López Trujillo, Jesús Alberto; Montañá Puig, Juan; Torres Sanchez, Horacio (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés obert
      This paper presents a selected, not exhaustive, description of lightning research in Colombia over time, based on natural observatories for experimentation and measurement; and introduces the DABEIBA Lightning Research ...

    • Observation and properties of a sub-cloud bidirectional leader 

      Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Williams, Earle R.; Pineda Ruegg, Nicolau; Romero Durán, David; Solà de las Fuentes, Glòria (2014)
      Text en actes de congrés
      Accés obert
      In this paper we present the evolution of a bidirectional leader which appeared in ‘virgin’ air. In the observations we did not find any delay between the onsets of the two leader ends. The positive leader end presented a ...

    • Observation of intrinsically bright terrestrial gamma ray flashes fromthe Mediterranean basin 

      Gjesteland, T.; Ostgaard, N.; Laviola, S.; Miglietta, M.M.; Arnone, E.; Marisaldi, Martino; Fuschino, Fabio; Collier, B.; Fabró Tàpia, Ferran; Montañá Puig, Juan (2015-12-14)
      Article
      Accés obert

    • On the classification of self-triggered versus other-triggered lightning flashes 

      Sunjerga, A.; Mostajabi, A.; Pineda Rüegg, Nicolau; Romero Durán, David; Van der Velde, Oscar Arnoud; Montanya, Joan; Azadifar, M.; Rubinstein, M.; Diendorfer, Gergard (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés obert
      We present in this paper lightning current measurements and LMA (Lightning Mapping Array) data associated with upward flashes observed at the Sàntis Tower during Summer 2017. The LMA network consists of six stations located ...

    • Optimization of surge arrester locations in overhead distribution networks 

      Bullich Massagué, Eduard; Sumper, Andreas; Villafafila Robles, Roberto; Rull Duran, Joan (2015-04-01)
      Article
      Accés obert
      Lightning is considered one of the main causes of faults in overhead distribution networks. Direct strokes usually lead to flashovers due to the insulation levels that are used. Induced overvoltages caused by indirect ...

    • Overview of lightning interaction and damages to wind turbines 

      Montañá Puig, Juan (2017)
      Text en actes de congrés
      Accés obert
      It is well known that tall structures such as telecommunication towers can be exposed to numerous lightning incidence. Wind turbines are in this group, but two particular characteristics distinguish wind turbines from the ...

    • Polarimetric radar characteristics of lightning initiation and propagating channels 

      Figueras i Ventura, Jordi; Pineda Rüegg, Nicolau; Besic, Nikola; Grazioli, Jacopo; Hering, Alessandro; Van der Velde, Oscar Arnoud; Romero Durán, David; Sunjerga, A.; Mostajabi, A.; Azadifar, M.; Rubinstein, M.; Montañá Puig, Juan; Germann, Urs; Rachidi-Haeri, Farhad (2019-05-27)
      Article
      Accés obert
      In this paper we present an analysis of a large dataset of lightning and polarimetric weather radar data collected in the course of a lightning measurement campaign that took place in the summer of 2017 in the area surrounding ...