Exploració per autor "Van der Velde, Oscar Arnoud"Més informacióMés informació

Ara es mostren els items 30-49 de 91

    • Estudi de l'episodi tornàdic nocturn amb precipitacions intenses del 2 de novembre de 2008 a Catalunya 

      Van der Velde, Oscar Arnoud; Bech, Joan; Pineda Rüegg, Nicolau; Rigo, Tomeu; Aran, Montserrat; Amaró, Jésica; Gayà, M; Arús, J; Montañá Puig, Juan (2010)
      Comunicació de congrés
      Accés restringit per decisió de l'autor
      Aquest estudi presenta una anàlisi d’un episodi de temps sever que va tenir lloc la matinada del 2 de novembre de 2008, quan la costa sud de Catalunya va estar afectada per una intensa depressió que va dur associada ...

    • 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 ...

    • Fair weather induced charges and currents on tall wind turbines and experiments with kites 

      López Trujillo, Jesús Alberto; Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Fabró Tàpia, Ferran; Romero Durán, David (Zakon Group, 2016)
      Text en actes de congrés
      Accés obert
      Earth’s atmospheric potential rapidly increases up to few tens of kilovolts below 200 m altitude. This potential drop will induce charge to tall objects at ground by virtue of electrostatic induction. In this work we ...

    • 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 ...

    • Gigantic jet discharges evolve stepwise through the middle atmosphere 

      Van der Velde, Oscar Arnoud; Montanya, Joan; López Trujillo, Jesús Alberto; Cummer, Steven A. (2019-09-25)
      Article
      Accés obert
      In 2002 it was discovered that a lightning discharge can rise out of the top of tropical thunderstorms and branch out spectacularly to the base of the ionosphere at 90¿km altitude. Several dozens of such gigantic jets have ...

    • Global distribution of winter lightning: a threat to wind turbines and aircraft 

      Montañá Puig, Juan; Fabró Tàpia, Ferran; Van der Velde, Oscar Arnoud; March Nomen, Víctor; Williams, Earle R.; Pineda Ruegg, Nicolau; Romero Durán, David; Solà de las Fuentes, Glòria; Freijo Álvarez, Modesto (2016-01-01)
      Article
      Accés obert
      Lightning is one of the major threats to multi-megawatt wind turbines and a concern for modern aircraft due to the use of lightweight composite materials. Both wind turbines and aircraft can initiate lightning, and very ...

    • 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 altitude leaders mapped by the Colombia lightning mapping array 

      Montañá Puig, Juan; López Trujillo, Jesús Alberto; Van der Velde, Oscar Arnoud; Romero Durán, David; Fabró Tàpia, Ferran (2016)
      Text en actes de congrés
      Accés obert
      On April 2015 a Lightning Mapping Array network (COL-LMA) was installed at the north of Colombia. This network provides 3D mapping of the development of lightning leaders. For the first time such network has been setup in ...

    • High spectral resolution spectroscopy of sprites: A natural probe of the mesosphere 

      Gordillo Vázquez, Francisco; Passas, Maria; Luque, Alejandro; Sánchez, Justo; Van der Velde, Oscar Arnoud; Montañá Puig, Juan (2018-02-06)
      Article
      Accés obert
      We present the first high spectral resolution (0.24 nm) spectra of sprites. These spectra were recorded in Europe in the summers and falls of 2015 and 2016 and during January 2017. The use of high-spectral resolution has ...

    • High-energy radiation from natural lightning observed in coincidence with a VHF broadband interferometer 

      Urbani, Michele; Montañá Puig, Juan; Van der Velde, Oscar Arnoud; López Trujillo, Jesús Alberto; Sousa Arcanjo, Marcelo Augusto; Fontanes Molina, Pol; Romero Durán, David; Roncancio Guzmán, José Andrés (2021-04-16)
      Article
      Accés obert
      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 in north-central Colombia, five ...

    • 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 ...

    • High-speed observations of transient luminous events and lightning (The 2008/2009 Ebro Valley campaign) 

      Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Soula, Serge; Romero Durán, David; Pineda Rüegg, Nicolau; Solà de las Fuentes, Glòria; March Nomen, Víctor (2010)
      Comunicació de congrés
      Accés restringit per decisió de l'autor

    • High-speed video of lightning and x-ray pulses during the 2009–2010 observation campaigns in northeastern Spain 

      Montañá Puig, Juan; Van der Velde, Oscar Arnoud; March Nomen, Víctor; Romero Durán, David; Solà de las Fuentes, Glòria; Pineda Rüegg, Nicolau (2012-11-01)
      Article
      Accés restringit per política de l'editorial
      This paper summarizes results obtained by the 2009–2010 field campaigns conducted in northeastern Spain using a high speed camera, VHF interferometer, VLF lightning location system and scintillation detectors for energetic ...

    • High-speed video recordings of lightning, electric fields and high-energy detections during thunderstorms in Catalonia Spain 

      Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Romero Durán, David; Pineda Rüegg, Nicolau; Betz, H.D.; March Nomen, Víctor; Solà de las Fuentes, Glòria (2010)
      Comunicació de congrés
      Accés obert
      High-speed video recordings of natural lightning flashes show amazing details of this phenomenon. The paper summarizes the results of the 2009 measurement campaign where the combination of electric fields, total ...

    • Initiation of lightning flashes simultaneously observed from space and the ground: Narrow bipolar events 

      López Trujillo, Jesús Alberto; Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Romero Durán, David; Gordillo Vázquez, Francisco; Pérez Invernón, Francisco José; Luque Estepa, Alejandro; Morales Rodríguez, Carlos Augusto; Neubert, Torsten; Rison, William; Krehbiel, P.; Navarro González, Javier; Østgaard, Nikolai; Reglero, Víctor (2022-04-15)
      Article
      Accés obert
      We investigate the initiation of four lightning flashes detected from ground by means of the Colombia Lightning Mapping Array (Colombia-LMA) and simultaneously observed from space by the optical sensors of the Atmosphere-Space ...

    • Lightning attachement test on a scale aircraft model as subject for educational purposes 

      Romero Durán, David; March Nomen, Víctor; Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Solà de las Fuentes, Glòria (2010)
      Comunicació de congrés
      Accés restringit per decisió de l'autor
      A new subject on lightning protection of aircraft has been developed at the Technical University of Catalonia. This elective subject is implemented according to project-based learning (PBL). In this way, during the ...

    • Lightning development associated with two negative gigantic jets 

      Rutledge, Steven A.; Lang, Timothy J.; Cohen, Morris B.; Van der Velde, Oscar Arnoud; MacGorman, Donald R.; Beasley, William; Stanley, Mark A.; Lu, Gaopeng; Cummer, Steven A.; Lyons, Walter A.; Krehbiel, Paul R.; Li, Jingbo; Rison, William; Thomas, Ronald J.; Edens, Harald E. (2011-06-21)
      Article
      Accés restringit per política de l'editorial
      We report observations of two negative polarity gigantic jets sufficiently near very high‐frequency (VHF) lightning mapping networks that the associated lightning characteristics and charge transfer could be investigated. ...

    • 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 Mapping Array in Ebre’s Delta: campaign 2011 results. Comparison with other LLS 

      Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Pineda Rüegg, Nicolau (2012)
      Presentació
      Accés restringit per decisió de l'autor

    • 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 ...