Now showing items 41-60 of 77

    • 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)
      Conference lecture
      Open Access
      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 ...
    • 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 (2010)
      Conference lecture
      Restricted access - author's decision
      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
      Restricted access - publisher's policy
      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)
      Conference report
      Restricted access - publisher's policy
      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)
      Lecture
      Restricted access - author's decision
    • 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)
      Conference report
      Open Access
      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 ...
    • LMA observation of upward flashes at Säntis Tower: preliminary result 

      Mostajabi, A.; Pineda Rüegg, Nicolau; Romero Durán, David; Azadifar, M.; Van der Velde, Oscar Arnoud; Montañá Puig, Juan; Rubinstein, M.; Rachidi, F (2018)
      Conference report
      Open Access
      Lightning striking tall towers is mainly of the upward lightning type, which is characterized by the absence of a first return stroke and the presence of an initial continuous current (ICC) with or without superimposed ...
    • LMA observations of upward lightning flashes at the Säntis Tower initiated by nearby lightning activity 

      Sunjerga, A.; Rubinstein, M.; Pineda, Nicolau; Mostajabi, A.; Azadifar, M.; Romero Durán, David; Van der Velde, Oscar Arnoud; Montanya, Joan; Figueras i Ventura, Jordi; Besic, Nikola; Grazioli, Jacopo; Hering, Alessandro; Germann, Urs; Diendorfer, Gerhard; Rachidi-Haeri, Farhad (2020-04)
      Article
      Restricted access - publisher's policy
      We present in this paper lightning current measurements, LMA (Lightning Mapping Array) data and fast antenna electric fields associated with upward flashes observed at the Säntis Tower during summer of 2017. The LMA network ...
    • Meteorological aspects of self-initiated upward lightning at the Säntis Tower (Switzerland) 

      Pineda, Nicolau; Figueras i Ventura, Jordi; Romero Durán, David; Mostajabi, A.; Azadifar, M.; Sunjerga, A.; Rachidi-Haeri, Farhad; Rubinstein, M.; Montanya, Joan; Van der Velde, Oscar Arnoud; Altube Vázquez, Patricia; Besic, Nikola; Grazioli, Jacopo; Germann, Urs; Williams, Earle R. (2019-12-26)
      Article
      Open Access
      Interest in exploring the meteorological conditions favoring upward lightning from tall man-made structures has grown in recent years, largely due to the worldwide expansion of wind energy. To this end, instrumented towers ...
    • Multi-instrumental analysis of large sprite events and of their producing storm in southwestern France 

      Soula, Serge; Van der Velde, Oscar Arnoud; Montañá Puig, Juan; Fullekrug, Martin; Farges, Thomas; Bór, József; Iacovella, F.; Georgis, Jean-Francois; Naitamor, S.; Martin, J.-M. (Elsevier, 2011)
      Conference report
      Open Access
      During the night of 01-02 September, 2009, several TLEs including 3 halos and 16 distinct sprites were observed above a storm in north-western Mediterranean Sea with a camera at Pic du Midi (42.93° N, 0.14° E, 2877 m). ...
    • 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 (2014)
      Conference report
      Open Access
      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 ...
    • Observations of the relationship between sprite morphology and in-cloud lightning processes 

      Van der Velde, Oscar Arnoud; Mika, Ágnes; Soula, Serge; Haldoupis, Christos; Neubert, Torsten; Inan, Umran S. (2006-08-04)
      Article
      Open Access
      [1] During a thunderstorm on 23 July 2003, 15 sprites were captured by a LLTV camera mounted at the observatory on Pic du Midi in the French Pyrénées. Simultaneous observations of cloud-to-ground (CG) and intracloud (IC) ...
    • Observations of Western Mediterranean TLE: LS8000 intracloud lightning and high-speed video 

      Van der Velde, Oscar Arnoud; Montañá Puig, Juan; Romero Durán, David; Soula, Serge; Pineda Rüegg, Nicolau; Bech, Joan; Reglero, V. (2009)
      Conference lecture
      Restricted access - author's decision
      Transient luminous events (TLE) are electrical phenomena occurring between the ionosphere and the tops of thunderstorms. First discovered in 1989, the family of TLE now consists of different members: sprites, sprite ...
    • 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)
      Conference report
      Open Access
      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 ...
    • On the TGF/lightning ratio asymmetry 

      Fabró Tàpia, Ferran; Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Pineda Rüegg, Nicolau; Williams, Earle R. (2019-05-14)
      Article
      Open Access
      Africa is one of the most productive lightning regions on Earth, yet it has a lower TGF-to-lightning ratio especially compared with Central America. In this paper we have analyzed the global distribution of different ...
    • 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
      Open Access
      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 ...
    • Registration of X-rays at 2500 m altitude in association with lightning flashes and thunderstorms 

      Montañá Puig, Juan; Fabró Tàpia, Ferran; Van der Velde, Oscar Arnoud; Romero Durán, David; Solà de las Fuentes, Glòria; Hermoso Costa, Juan Ramón; Soula, Serge; Williams, Earle; Pineda Rüegg, Nicolau (2014)
      Article
      Open Access
      Electric fields and high-energy radiation of natural lightning measured at close range from a mountaintop tower are discussed. In none of the 12 negative cloud-to-ground upward flashes were X-rays observed. Also no energetic ...
    • Relativistic electron beams above thunderclouds 

      Neubert, Torsten; Pasko, V.P.; Bennet, A. J.; Fullekrug, Martin; Roussel Dupré, Robert; Symbalisty, Eugene M. D.; Colman, J.J.; Chanrion, Olivier; Soula, Serge; Van der Velde, Oscar Arnoud; Odzimek, Anna (2011)
      Article
      Open Access
      Non-luminous relativistic electron beams above thunderclouds have been detected by the radio signals of low frequency ~ 40–400 kHz which they radiate. The electron beams occur ~ 2–9 ms after positive cloud-to-ground lightning ...
    • 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
      Open Access
      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 ...
    • 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)
      Conference report
      Open Access
      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 ...