Ara es mostren els items 190-209 de 232

    • Schumann Resonance spectral characteristics: a useful tool to study Transient Luminous Events (TLEs) on global scale 

      Guha, Anirban; Williams, Earle R.; Boldi, Robert; Satori, Gabriella; Nagy, Tamás; Montañá Puig, Juan; Ortega, Pascal (2014)
      Text en actes de congrés
      Accés obert
    • Seasonal variations on the conditions required for the lightning production 

      Salvador Yuste, Albert; Pineda Rüegg, Nicolau; Montañá Puig, Juan; Solà de las Fuentes, Glòria (2020-10-01)
      Article
      Accés obert
      Given the growing concern on lightning threats outside the main warm-season, the objective of this study is to get further insight on the seasonal variations of the necessary conditions required for the production of ...
    • SELECCIÓ I TRACTAMENT DE MATERIALS - A (1 quadr., 2a avaluació) 

      Montañá Puig, Juan (Universitat Politècnica de Catalunya, 2010-01-22)
      Examen
      Accés restringit a la comunitat UPC
    • SELECCIÓ I TRACTAMENT DE MATERIALS - B (1 quadr., 2a avaluació) 

      Montañá Puig, Juan (Universitat Politècnica de Catalunya, 2010-01-18)
      Examen
      Accés restringit a la comunitat UPC
    • Small scale simulation of lightning using vertical wires deployed by drones: on the land and sea peak current asymetry 

      Montañá Puig, Juan; Fontanes Molina, Pol; Arcanjo, Marcelo; Urbani, Michele; Williams, Earle Rolfe; Romero Durán, David; Horta Bernús, Ricard; López Trujillo, Jesús Alberto; Van der Velde, Oscar Arnoud; Pineda Rüegg, Nicolau (2022)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work we simulate lightning by means of vertical wires deployed by a multirotor drone under fair weather conditions. These wires, when isolated from ground, acquire an electric potential by virtue of electrostatic ...
    • Spatio-temporal dimension of lightning flashes based on three-dimensional Lightning Mapping Array 

      López Trujillo, Jesús Alberto; Pineda Rüegg, Nicolau; Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Fabró Tàpia, Ferran; Romero Durán, David (2017-10-15)
      Article
      Accés obert
      3D mapping system like the LMA - Lightning Mapping Array - are a leap forward in lightning observation. LMA measurements has lead to an improvement on the analysis of the fine structure of lightning, allowing to characterize ...
    • Spectroscopy of a mesospheric ghost reveals iron emissions 

      Passas, Maria; Van der Velde, Oscar Arnoud; Gordillo Vázquez, Francisco; Gómez-Martín, Juan Carlos; Sánchez, Justo; Pérez Invernón, Francisco José; Sánchez-Ramírez, Rubén; García Comas, Maia; Montañá Puig, Juan (2023-12-12)
      Article
      Accés obert
      Mesospheric Green emissions from excited Oxygen in Sprite Tops (ghosts) are infrequent and faint greenish transient luminous events that remain for hundreds of milliseconds on top of certain energetic sprites. The main ...
    • Sprites and elves as proxy of energetic lightning flashes in winter: what can we learn from mesospheric discharges for the protection of wind turbines? 

      Montañá Puig, Juan; Fabró Tàpia, Ferran; Van der Velde, Oscar Arnoud; Hermoso, Blas (2011)
      Text en actes de congrés
      Accés obert
      Sprites and Elves are commonly observed in Europe, especially also in winter maritime storms. It is well known that sprites are related to large electric charge positive flashes and elves are related with high amplitude ...
    • Statistics and variability of the altitude of elves 

      Van der Velde, Oscar Arnoud; Montañá Puig, Juan (2016-05-07)
      Article
      Accés obert
      From June 2008 to January 2016 nearly 800 elves have been recorded by a low-light camera in northeastern Spain. Elves occur in this region mainly over the lower-topped cold airmass maritime thunderstorms, peaking from ...
    • Study of single-flash thunderstorms over wind farms in the Basque Country 

      López, Javier; Hernáez, Iñigo; Montañá Puig, Juan (IEEEXPLORE, 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper presents six different thunderstorms affecting wind farms in the Basque Country. In this work, single-flash thunderstorms are discussed. The term single-flash is used in order to refer thunderstorms that leave ...
    • Study of the total lightning activity in a hailstorm 

      Montañá Puig, Juan; Soula, Serge; Pineda Rüegg, Nicolau; Van der Velde, Oscar Arnoud; Clapers, Pere; Solà de las Fuentes, Glòria; Bech, Joan; Romero Durán, David (2007)
      Comunicació de congrés
      Accés restringit per decisió de l'autor
      A thunderstorm which developed in North-Eastern region of Spain on 16th June, 2006 is analyzed. This thunderstorm could be severe because it produced hailstones larger than 19 mm. The cell life time was 3h 30 minutes. ...
    • Study of the total lightning activity in a hailstorm 

      Montañá Puig, Juan; Soula, Serge; Pineda, Nicolau; Van der Velde, Oscar Arnoud; Clapers, Pere; Solà de las Fuentes, Glòria; Bech, Joan; Romero Durán, David (2009)
      Article
      Accés restringit per decisió de l'autor
      A thunderstorm that developed over northeastern Spain on 16 June 2006 is analyzed. This severe thunderstorm produced hailstones as large as 40 mm and had a lifetime of 3 h and 30 min. Radar cross-sections show strong ...
    • Temporal and spatial evolution of intracloud lightning associated ith sprite-producing positive cloud-to-ground flashes in Northeastern Spain 

      Van der Velde, Oscar Arnoud; Montañá Puig, Juan; Soula, Serge; Pineda Rüegg, Nicolau; Chanrion, Olivier (2009)
      Comunicació de congrés
      Accés restringit per decisió de l'autor
    • Test and simulation of lightning current distribution on a wind turbine blade 

      Romero Durán, David; Montañá Puig, Juan; Vinck, Jeroen (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Design of the lightning protection system (LPS) of complex wind turbine blades must take into account how current is distributed along possible paths to ground. The flow of lightning currents can result in overvoltages ...
    • The 2007 objectives of the Eagle Nest Tower 

      Solà de las Fuentes, Glòria; Montañá Puig, Juan; Romero Durán, David; March Nomen, Víctor (2007)
      Comunicació de congrés
      Accés restringit per decisió de l'autor
    • The 2018 revision of the standard IEC 61400-24 : lightning protection of wind turbines 

      Mendez, Y.; Birkl, J.; Madsen, S.; Montañá Puig, Juan (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés obert
      The first edition of the standard IEC 61400-24, Wind Generator Systems-Part 24 Lightning Protection, was issued in June 2010, and the scope was to reflect the experiences and technical understanding of lightning protection ...
    • The influence of the voltage-time derivative in X-rays emission from laboratory sparks 

      March Nomen, Víctor; Montañá Puig, Juan (2010-08-23)
      Article
      Accés obert
      X-ray produced by laboratory sparks in air at atmospheric pressure for rod-rod and rod-plane configurations were observed. A total of 585 sparks were applied with both polarities. The paper shows the effects of the voltage ...
    • The start of lightning: evidence of bidirectional lightning initiation 

      Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Williams, Earle R. (Macmillan Publishers, 2015-10-18)
      Article
      Accés obert
      Lightning flashes are known to initiate in regions of strong electric fields inside thunderstorms, between layers of positively and negatively charged precipitation particles. For that reason, lightning inception is ...
    • Thunderstorm characteristics favouring downward and upward lightning to wind turbines 

      Pineda, Nicolau; Montañá Puig, Juan; Salvador Yuste, Albert; Van der Velde, Oscar Arnoud; López Trujillo, Jesús Alberto (2018-12-01)
      Article
      Accés obert
      Meteorological conditions and thunderstorm characteristics related to lightning threats to wind turbines are discussed in this paper. Due to the rotating blades, wind turbines may be regarded peculiar tall objects, more ...
    • Thunderstorm charge structures favouring cloud-to-ground lightning 

      Salvador Yuste, Albert; Pineda Rüegg, Nicolau; Montañá Puig, Juan; Solà de las Fuentes, Glòria (2021-08)
      Article
      Accés obert
      Thunderstorm electrical structures favouring cloud-to-ground lightning were investigated through a Lightning Mapping Array (LMA), an accurate three-dimensional lightning location system that allows inferring the heights ...