Now showing items 1-8 of 8

    • A closer look at lightning reveals needle-like structures 

      Williams, Earle R.; Montañá Puig, Juan (Macmillan Publishers, 2019-04-17)
      Article
      Open Access
      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
      Open Access
      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). ...
    • 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
      Open Access
      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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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)
      Conference report
      Open Access
    • 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
      Open Access
      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 ...