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    Registration of X-rays at 2500 m altitude in association with lightning flashes and thunderstorms  Open access

     Montaña Puig, Juan; Fabro Tapia, Ferran; Van Der Velde, Oscar Arnoud; Romero Duran, David; Sola De Las Fuentes, Gloria; Hermoso Costa, Juan Ramon; Soula, Serge; Williams, Earle; Pineda Ruegg, Nicolau
    Journal of geophysical research: atmospheres
    Date of publication: 2014
    Journal article

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    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 radiation was found in one negative upward leader at close range (20¿m). In the first of two consecutive negative cloud-to-ground flashes, X-rays were detected during the last ~1.75¿ms of the leader. During the time of energetic radiation in the flash an intense burst of intracloud VHF sources was located by the interferometers. The X-ray production is attributed to the high electric field runaway electron mechanism during leader stepping. Even though the second flash struck closer than the previous one, no X-rays were detected. The absence of energetic radiation is attributed to being outside of the beam of X-ray photons from the leader tip or to the stepping process not allowing sufficiently intense electric fields ahead of the leader tip. High-speed video of downward negative leaders at the time when X-rays are commonly detected on the ground revealed the increase of speed and luminosity of the leader. Both phenomena allow higher electric fields at the leader front favoring energetic radiation. Background radiation was also measured during thunderstorms. The count rate of a particular day is presented and discussed. The increases in the radiation count rate are more coincident with radar reflectivity levels above ~30 dBZ than with the total lightning activity close to the site. The increases of dose are attributed to radon daughter-ion precipitation

    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 radiation was found in one negative upward leader at close range (20¿m). In the first of two consecutive negative cloud-to-ground flashes, X-rays were detected during the last ~1.75¿ms of the leader. During the time of energetic radiation in the flash an intense burst of intracloud VHF sources was located by the interferometers. The X-ray production is attributed to the high electric field runaway electron mechanism during leader stepping. Even though the second flash struck closer than the previous one, no X-rays were detected. The absence of energetic radiation is attributed to being outside of the beam of X-ray photons from the leader tip or to the stepping process not allowing sufficiently intense electric fields ahead of the leader tip. High-speed video of downward negative leaders at the time when X-rays are commonly detected on the ground revealed the increase of speed and luminosity of the leader. Both phenomena allow higher electric fields at the leader front favoring energetic radiation. Background radiation was also measured during thunderstorms. The count rate of a particular day is presented and discussed. The increases in the radiation count rate are more coincident with radar reflectivity levels above ~30 dBZ than with the total lightning activity close to the site. The increases of dose are attributed to radon daughter-ion precipitation

  • X-rays from laboratory sparks in air: the relationship between runaway electrons and the electric field

     March Nomen, Víctor; Montaña Puig, Juan; Romero Duran, David; Sola De Las Fuentes, Gloria; Van Der Velde, Oscar Arnoud
    International Conference on Lightning Protection
    Presentation's date: 2012-09-04
    Presentation of work at congresses

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    This article presents an experiment in which the gap distance was varied between 46 and 84 cm. Series of 15 voltage impulses were applied for each distance and different peak voltages with a rise time of 600 ns. The results of a total of 20 series of impulse voltages show that emissions depend on the electric field derivative within the gap

  • Two upward lightning at the Eagle Nest tower

     Montaña Puig, Juan; Van Der Velde, Oscar Arnoud; Romero Duran, David; March Nomen, Víctor; Sola De Las Fuentes, Gloria; Pineda Ruegg, Nicolau; Soula, Serge; Hermoso Alameda, Blas
    International Conference on Lightning Protection
    Presentation of work at congresses

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    A new instrument composed by a high speed camera, two high energy detectors, a E-field antenna and a VHF antenna were installed at the Eagle Nest tower (northeast of Spain) during summer 2011. With this equipment several lightning flashes to the tower and its vicinity have been observed. This paper presents two examples: the first was an upward negative leader triggered by a close c1oud-to-ground flash and the second was an upward negative flash not associated with previous lightning activity. The paper also presents 3D mapping of leaders of two upward lightning

  • Total lightning observations to wind turbines

     Montaña Puig, Juan; Van Der Velde, Oscar Arnoud; Romero Duran, David; March Nomen, Víctor; Sola De Las Fuentes, Gloria; Pineda Ruegg, Nicolau; Hermoso Alameda, Blas; Senosiáin Miquélez, vicente
    International Conference on Lightning Protection
    Presentation's date: 2012-09-07
    Presentation of work at congresses

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    In summer 2011 a new VHF Lightning Mapping Array was installed at the northeast of Spain. In that area a VHF interferometer and a VLFILF lightning detection networks are also operative. The close presence of wind farms in the area of the Lightning Mapping Array showed some lightning activity not reported before. This paper describes the observations and discusses the possible effects to the wind turbine lightning protection

  • ATMOSPHERE-SPACE INTERACTIONS MONITOR

     Sola De Las Fuentes, Gloria; Van Der Velde, Oscar Arnoud; Romero Duran, David; Montaña Puig, Juan
    Participation in a competitive project

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  • A propagative model for simulations of electric fields produced by downward leaders

     Hermoso Costa, Juan Ramon; Montaña Puig, Juan; March Nomen, Victor; Van Der Velde, Oscar Arnoud; Sola De Las Fuentes, Gloria; Romero Duran, David; Hermoso Alameda, Blas; Pineda Ruegg, Nicolau
    Journal of lightning research
    Date of publication: 2012-07-13
    Journal article

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

     Montaña Puig, Juan; Van Der Velde, Oscar Arnoud; March Nomen, Víctor; Romero Duran, David; Sola De Las Fuentes, Gloria; Pineda Ruegg, Nicolau
    Atmospheric research
    Date of publication: 2012-11-01
    Journal article

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    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 radiation. The main purpose was to obtain new insight into the lightning processes which emit x/γ radiation. For just one (very close) lightning strike, 99 x-ray pulses were emittedwithin 0.86 ms and had an energy higher that 10 keV. This burst was associated with the final stages of a downward negative leader. The high-speed camera data also allowed to identify various previously unreported features in different types of cloud-to-ground lightning flashes. At video frame rates of 10,000 fps, some branches of negative leaders of cloud-to-ground flashes were illuminated for the duration of only one frame. During positive cloud-to-ground flashes, the high speed videos showed an intense activity of recoil leaders. In the case of intra-cloud lightning, the VHF interferometer network did not present a clear relation between detections and visible leader. Instead, bursts of VHF detections corresponded visually to a long-lasting bright channel under the cloud base

  • High-speed intensified video recordings of sprites and elves over the western Mediterranean Sea during winter thunderstorms

     Montaña Puig, Juan; Romero Duran, David; March Nomen, Victor; Van Der Velde, Oscar Arnoud; Sola De Las Fuentes, Gloria; Pineda, Nicolau; Arrayas, M.; Trueba, Jose Luis; Reglero, V.; Soula, Serge
    Journal of geophysical research
    Date of publication: 2010-04-17
    Journal article

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    Comparison between high-speed video recordings of lightning and the detections of the Catalan Lightning Location Network (XDDE)  Open access

     Montaña Puig, Juan; Pineda Ruegg, Nicolau; Sola De Las Fuentes, Gloria; Romero Duran, David; Aranguren Fino, Daniel; Van Der Velde, Oscar Arnoud
    International Lightning Detection Conference
    Presentation's date: 2010-04-20
    Presentation of work at congresses

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    Lightning detections of the Catalan Lightning Location Network (XDDE) are compared with high speed video recordings carried out in Spain during summer 2009. At that time the XDDE was composed by four sensors: two SAFIR 3000 type and two LS8000 type. The comparison showed good agreement in the observations at the center and at the south of the network. However, the observations recorded at the north of the network showed a poorer detection efficiency and location accuracy. On the other hand, the fine comparison between frame by frame of video recordings and network detections reveals that the network often detects mostly intra-cloud (IC) sources which probably belong to the preliminary breakdown in downward cloud-to-ground flashes. In some cases few sources are detected during steeped leaders toward to the ground. In the case of our observed IC flashes, the detected sources never corresponded to observations of propagation leaders, if not, small burst of detections were linked to permanent illuminated channels or permanent visible luminosity from the cloud.

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

     Montaña Puig, Juan; Van Der Velde, Oscar Arnoud; Soula, Serge; Romero Duran, David; Pineda Ruegg, Nicolau; Sola De Las Fuentes, Gloria; March Nomen, Victor
    European Geosciences Union General Assembly
    Presentation's date: 2010-05-05
    Presentation of work at congresses

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

     Montaña Puig, Juan; Van Der Velde, Oscar Arnoud; Romero Duran, David; Pineda Ruegg, Nicolau; Betz, H.D.; March Nomen, Victor; Sola De Las Fuentes, Gloria
    International Conference on Lightning Protection
    Presentation's date: 2010-09-13
    Presentation of work at congresses

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    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, high-energy detections and high-speed videos provided a valuable data. The paper describes the visible differences between the recorded negative, positive and upward cloudto- ground flashes. Thanks to the precise time synchronization of each video frame we investigated which processes are detected by the lightning location networks (VHF and VLF). We suggest that the VHF interferometer network detects mostly those processes of intra-cloud flashes where substantial charge is transferred during few milliseconds. The study of the detections of intra-cloud events provided by the VLF network were related to high and fast (less than a millisecond) charge transfers within the cloud that saturated the camera in the same manner as return strokes in cloud-to-ground flashes. In other hand, the paper discusses the high-energy detections related to a very close cloud-to-ground lightning flash.

  • A propagative model for simulations of electric fields produced by downward leaders

     Hermoso Costa, Juan Ramon; Montaña Puig, Juan; March Nomen, Victor; Romero Duran, David; Sola De Las Fuentes, Gloria; Van Der Velde, Oscar Arnoud
    International Conference on Lightning Protection
    Presentation's date: 2010-09-13
    Presentation of work at congresses

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  • Estimation of charge neutralized by negative cloud-to-ground flashes in Catalonia thunderstorms

     Montaña Puig, Juan; Soula, S; Murphy, M; March Nomen, Victor; Aranguren, D; Sola De Las Fuentes, Gloria; Romero Duran, David
    Journal of electrostatics
    Date of publication: 2009-05
    Journal article

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  • On the lightning hazard warning using electrostatic field: Analysis of summer thunderstorms in Spain

     Aranguren, D; Montaña Puig, Juan; Sola De Las Fuentes, Gloria; March Nomen, Victor; Romero Duran, David; Torres, H
    Journal of electrostatics
    Date of publication: 2009-05
    Journal article

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  • Features of electrical discharges in air triggered by laser

     March Nomen, Victor; Arrayas, M; Trueba, Jl; Montaña Puig, Juan; Romero Duran, David; Sola De Las Fuentes, Gloria; Aranguren, D
    Journal of electrostatics
    Date of publication: 2009-05
    Journal article

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  • Study of the total lightning activity in a hailstorm

     Montaña Puig, Juan; Soula, Serge; Pineda, Nicolau; Clapers, Pere; Van Der Velde, Oscar Arnoud; Sola De Las Fuentes, Gloria; Bech Rustullet, Joan; Romero Duran, David
    Atmospheric research
    Date of publication: 2009
    Journal article

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    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 vertical development with cloud echo tops reaching an altitude of 13 km. The specific characteristics of the lightning activity of this storm were: (i) a large amount (81%) of negative cloud-to-ground (−CG) flashes with very low peak currents (b10 kA in absolute value), (ii) a very large proportion of intra-cloud (IC) flashes with an IC/CG ratio reaching about 400, (iii) a large number of “short” IC flashes (with only 1-VHF source according to SAFIR detection), (iv) a large increase of the −CG flash rate and of the CG proportion near the end of the storm.

  • UPC LIGHTNING RESEARCH GROUP UPC-LRG

     Romero Duran, David; March Nomen, Victor; Van Der Velde, Oscar Arnoud; Sola De Las Fuentes, Gloria; Montaña Puig, Juan
    Participation in a competitive project

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  • A Review of Current Issues in Lightning Protection of New-Generation Wind-Turbine Blades

     Rachidi, F; Rubinstein, M; Montaña Puig, Juan; Bermudez, J-L; Rodriguez Sola, Raul; Sola De Las Fuentes, Gloria; Korovkin, N
    IEEE transactions on industrial electronics
    Date of publication: 2008-06
    Journal article

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  • Total lightning, electrostatic field and meteorological radar applied to lightning hazard warning

     Montaña Puig, Juan; Aranguren Fino, Daniel; Pineda Ruegg, Nicolau; Sola De Las Fuentes, Gloria; Romero Duran, David; March Nomen, Victor
    International Lightning Detection Conference
    Presentation's date: 2008-04-21
    Presentation of work at congresses

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  • Fast current impulse test for wind-turbine blades

     Montaña Puig, Juan; Clapers, Pere; Hermoso Alameda, Blas; March Nomen, Victor; Sola De Las Fuentes, Gloria; Illa Arnau, Àngel; Romero Duran, David; Aranguren Fino, Daniel; Hermoso Costa, Juan Ramon
    European Electromagnetics
    Presentation's date: 2008-07-21
    Presentation of work at congresses

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  • Protection of large wind turbine blades against lightning

     Montaña Puig, Juan; Rachidi-Haeri, Farhad; Rubinstein, Marcos; Bermúdez, José Luis; Sola De Las Fuentes, Gloria; Hermoso Alameda, Blas
    International Conference on Lightning Protection
    Presentation of work at congresses

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    Lightning protection of modern wind turbines presents a number of new challenges due to the geometrical, electrical and mechanical particularities of the turbines. The risk assessment requires the estimation of the number of expected strikes. In the case of modern turbines, most of the expected lightning flashes will be upward. In addition, due to the rotation of the blades, modern wind turbines may trigger their own lightning. Moreover, since wind turbines are becoming tall structures, lightning currents that are injected by return strokes into the turbines may be affected by the structure itself. The presence of carbon reinforced plastics in the blades introduces a new set of problems. The validation of lightning protection systems for wind-turbine blades is therefore an important issue. This paper presents some open questions related to lightning protection of large wind turbines. The paper also presents two full-scale blade impulse current tests that allow the evaluatation of current distributions and potential differences for the first and second return stroke currents defined in the corresponding IEC standards.

  • Laser beam influence in the initiation and streamer propagation

     March Nomen, Victor; Montaña Puig, Juan; Arrayás, Manuel; Trueba, Jose Luis; Sola De Las Fuentes, Gloria; Romero Duran, David; Hermoso Costa, Juan Ramon
    International Conference on Lightning Protection
    Presentation of work at congresses

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  • A study of the total lightning activity in two hailstorms

     Montaña Puig, Juan; Soula, S; Pineda, N; Clapers, Pere; Sola De Las Fuentes, Gloria; Van Der Velde, Oscar Arnoud; Bech Rustullet, Joan; Romero, D
    Journal of geophysical research
    Date of publication: 2007-07
    Journal article

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  • The 2007 objectives of the Eagle Nest Tower

     Sola De Las Fuentes, Gloria; Montaña Puig, Juan; Romero Duran, David; March Nomen, Victor
    International Symposium on Lightning Physics and Effects (COST P18, ESF)
    Presentation's date: 2007-04-19
    Presentation of work at congresses

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  • Lightning detections and electrostatic field related to a flash that damaged a building in the city of Terrassa (Spain)

     Montaña Puig, Juan; March Nomen, Victor; Sola De Las Fuentes, Gloria; Romero Duran, David; Hermoso Alameda, Blas
    European Lightning Detection Workshop
    Presentation's date: 2007-05-21
    Presentation of work at congresses

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  • Analysis of the altitude of the isotherns and the electrical charge for flashes that struck the Gaisberg Tower

     Montaña Puig, Juan; Soula, Serge; Diendorfer, Gergard; Sola De Las Fuentes, Gloria; Romero Duran, David
    International Conference on Atmospheric Electricity
    Presentation's date: 2007-08-13
    Presentation of work at congresses

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  • The 2007 objectives of the Eagle Nest Tower

     Sola De Las Fuentes, Gloria; Montaña Puig, Juan; Romero Duran, David; March Nomen, Victor
    European Lightning Detection Workshop
    Presentation's date: 2007-05-21
    Presentation of work at congresses

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  • Study of the total lightning activity in a hailstorm

     Montaña Puig, Juan; Soula, Serge; Pineda Ruegg, Nicolau; Van Der Velde, Oscar Arnoud; Clapers, Pere; Sola De Las Fuentes, Gloria; Bech Rustullet, Joan; Romero Duran, David
    International Conference on Atmospheric Electricity
    Presentation's date: 2007-07-13
    Presentation of work at congresses

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    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. Radar cross-sections show a strong vertical development with cloud tops reaching an altitude of 13 km. During the first 3 h, in its mature stage, cloud-to-ground (CG) flash rates remained very low (under 1 min-1) with sometimes slightly dominant positive CG flashes. The maximum intra-cloud (IC) flash rate (67 min-1) peaked 24 minutes before the presence of reflectivity higher than 60 dBZ. During high reflectivity within the cloud the IC activity abruptly decreased. The maximum reflectivity observed by radar was consistent with the reported hail at ground.

  • GRI: Gamma-ray Imaging: Contribución de la UPC

     Romero Duran, David; Montaña Puig, Juan; Van Der Velde, Oscar Arnoud; Pineda Ruegg, Nicolau; March Nomen, Victor; Sola De Las Fuentes, Gloria; Soula, Serge
    Participation in a competitive project

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  • Two-years (2004-2005) of Safir evaluation in Catalonia

     Montaña Puig, Juan; Pineda Ruegg, Nicolau; March Nomen, Victor; Illa Arnau, Àngel; Romero Duran, David; Sola De Las Fuentes, Gloria
    International Lightning Detection Conference
    Presentation's date: 2006
    Presentation of work at congresses

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  • First Steps on The "Eagle Nest" Instrumented Tower in Spain

     Montaña Puig, Juan; Romero Duran, David; Hermoso Costa, Juan Ramon; Sola De Las Fuentes, Gloria
    28th International Conference on Lightning Protection
    Presentation of work at congresses

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  • Fuentes de energía eléctrica

     Mujal Rosas, Ramon Maria; Boix Aragonès, Oriol; Casals Terre, Jasmina; Colom Fajula, Xavier; Salueña Berna, Javier; Sola De Las Fuentes, Gloria; Pérez Fortes, Maria del Mar; Valgañón, Ignasi
    Date of publication: 2005-11
    Book

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  • Fuentes de energía eléctrica. Animaciones.

     Mujal Rosas, Ramon Maria; Boix Aragonès, Oriol; Casals Terre, Jasmina; Colom Fajula, Xavier; Salueña Berna, Javier; Sola De Las Fuentes, Gloria; Pérez Fortes, Maria del Mar; Marin Genesca, Marcos; Valgañón, Ignasi
    Date of publication: 2005-11
    Book

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  • Análisis electromagnético del motor de inducción con rotor de chapas en espiral

     Mujal Rosas, Ramon Maria; Boix Aragonès, Oriol; Casals Terre, Jasmina; Pérez Fortes, Maria del Mar; Sola De Las Fuentes, Gloria
    XIV Reunión de Grupos de Investigación de Ingeniería Eléctrica
    Presentation of work at congresses

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  • Nuevos materiales docentes. Clases virtuales y materiales docentes. Clases virtuales y materiales multimedia

     Mujal Rosas, Ramon Maria; Casals Terre, Jasmina; Boix Aragonès, Oriol; Colom Fajula, Xavier; Salueña Berna, Javier; Miñarro, Adrià; Pérez Fortes, Maria del Mar; Sola De Las Fuentes, Gloria
    XIV Reunión de Grupos de Investigación de Ingeniería Eléctrica
    Presentation of work at congresses

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