Van Der Velde, Oscar Arnoud
Total activity: 48
Research group
LRG - Lightning Research Group
Department
Department of Electrical Engineering
E-mail
oscar.van.der.veldeupc.edu
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1 to 48 of 48 results
  • Multi-instrumental analysis of large sprite events and their producing storm in southern France

     Soula, Serge; Iacovella, F.; Van Der Velde, Oscar Arnoud; Montaña Puig, Juan; Füllekrug, M.; Farges, T.; Bór, J.; Georgis, J.-F.; NaitAmor, S.; Martin, J. M.
    Atmospheric research
    Date of publication: 2014-01-13
    Journal article

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    During the night of 01¿02 September, 2009, seventeen distinct sprite events including 3 halos were observed above a storm in north-western Mediterranean Sea, with a video camera at Pic du Midi (42.93N; 0.14E; 2877 m). The sprites occurred at distances between 280 and 390 km which are estimated based on their parent CG location. The MCS-type storm was characterized by a trailing-stratiform structure and a very circular shape with a size of about 70,000 km2 (cloud top temperature lower than - 35 °C) when the TLEs were observed. The cloud to ground (CG) flash rate was large (45 min- 1) one hour before the TLE observation and very low (< 5 min- 1) during it. Out of the 17 sprite events, 15 parent + CG (P + CG) strokes have been identified and their average peak current is 87 kA (67 kA for the 14 events without halo), while the associated charge moment changes (CMC) that could be determined, range from 424 to 2088 ± 20% C km. Several 2-second videos contain multiple sprite events: one with four events, one with three events and three with two events. Column and carrot type sprites are identified, either together or separately. All P + CG strokes are clearly located within the stratiform region of the storm and the second P + CG stroke of a multiple event is back within the stratiform region. Groups of large and bright carrots reach ~ 70 km height and ~ 80 km horizontal extent. These groups are associated with a second pulse of electric field radiation in the ELF range which occurs ~ 5 ms after the P + CG stroke and exhibits the same polarity, which is evidence for current in the sprite body. VLF perturbations associated with the sprite events were recorded with a station in Algiers.

  • Sprites in low-frequency radio noise

     Fullekrug, Martin; Mezentsev, Andrew; Soula, Serge; Van Der Velde, Oscar Arnoud; Farges, Thomas
    Geophysical research letters
    Date of publication: 2013-05-30
    Journal article

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  • Asymmetries in bidirectional leader development of lightning flashes

     Van Der Velde, Oscar Arnoud; Montaña Puig, Juan
    Journal of geophysical research
    Date of publication: 2013-12-19
    Journal article

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  • Ionospheric density perturbations recorded by DEMETER above intense thunderstorms

     Parrot, Michel; Sauvaud, J.A.; Soula, Serge; Pinçon, Jean-Louis; Van Der Velde, Oscar Arnoud
    Journal of geophysical research
    Date of publication: 2013-08
    Journal article

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    DEMETER (Detection of Electromagnetic Emissions Transmitted From Earthquake Regions) was a three-axis stabilized Earth-pointing spacecraft launched on 29 June 2004 into a low-altitude (710km) polar and circular orbit that was subsequently lowered to 650km until the end of the mission in December 2010. DEMETER measured electromagnetic waves all around the Earth, except in the auroral zones (invariant latitude >65 degrees). The frequency range for the electric field was from DC up to 3.5MHz, and for the magnetic field, it was from a few hertz up to 20kHz. At its altitude, the phenomena observed on the E field and B field spectrograms recorded during nighttime by the satellite in the very low frequency range are mainly dominated by whistlers. In a first step, the more intense whistlers have been searched. They correspond to the most powerful lightning strokes occurring below DEMETER. Then, it is shown that this intense lightning activity is able to perturb the electron and ion densities at the satellite altitude (up to 133%) during nighttime. These intense lightning strokes are generally associated with transient luminous events, and one event with many sprites recorded on 17 November 2006 above Europe is reported. Examining the charged particle precipitation, it is shown that this density enhancement in the high ionosphere can be related to the energetic particle precipitation induced by the strong whistlers emitted during a long-duration thunderstorm activity at the same location.

  • Electron acceleration above thunderclouds

     Fullekrug, Martin; Kolmasova, Ivana; Santolik, Ondrej; Farges, Thomas; Bór, József; Bennett, Alec; Parrot, Michel; Rison, William; Zanotti, Ferruccio; Arnone, E.; Mezentsev, Andrew; Lan, Radek; Uhlir, Ludek; Harrison, Giles; Soula, Serge; Van Der Velde, Oscar Arnoud; Pinçon, Jean-Louis; Helling, Christiane; Diver, Declan
    Environmental research letters
    Date of publication: 2013-08-13
    Journal article

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    The acceleration of electrons results in observable electromagnetic waves which can be used for remote sensing. Here, we make use of ~4 Hz-66 MHz radio waves emitted by two consecutive intense positive lightning discharges to investigate their impact on the atmosphere above a thundercloud. It is found that the first positive lightning discharge initiates a sprite where electrons are accelerated during the exponential growth and branching of the sprite streamers. This preconditioned plasma above the thundercloud is subsequently exposed to a second positive lightning discharge associated with a bouncing-wave discharge. This discharge process causes a re-brightening of the existing sprite streamers above the thundercloud and initiates a subsequent relativistic electron beam. © 2013 IOP Publishing Ltd.

  • Illumination of mesospheric irregularity by lightning discharge

     Fullekrug, Martin; Mezentsev, Andrew; Soula, Serge; Van Der Velde, Oscar Arnoud; Evans, Adrian J.
    Geophysical research letters
    Date of publication: 2013-12-20
    Journal article

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    Theoretical model calculations recently predicted the existence of mesospheric irregularities which assist the initiation of sprites. Here we report the experimental detection of a ~3-19 km3 large mesospheric irregularity at ~80-85 km height which is illuminated by the electromagnetic field of an intense positive cloud-to-ground lightning discharge. While the lightning discharge causes a prompt group of four sprites above the lightning discharge, the mesospheric irregularity is found at a horizontal distance at least ~15-20 km away from the sprite group and it rebrightens ~40-60 ms after the sprite group occurrence. This rebrightening is driven by a local quasi-static electric field enhancement with a charge moment ~4-20 Ckm which causes the irregularity to develop a downward descending luminous column from ~75-85 km height. The quasi-static electric field enhancement is caused by the reorganization of residual charge inside the thundercloud during a high-level activity of intracloud discharges with ~10-20 pulses per ms. Such mesospheric irregularities might have an effect on the wave propagation of 100 kHz radio waves which are used for atomic time transfer and marine navigation. © 2013. The Authors.

  • 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

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

     Montaña Puig, Juan; Van Der Velde, Oscar Arnoud; Pineda Ruegg, Nicolau
    European Lightning Detection Workshop
    Presentation's date: 2012-10-25
    Presentation of work at congresses

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  • Characteristics of lightning related to wildfire ignitions in Catalonia

     Pineda Ruegg, Nicolau; Montaña Puig, Juan; Van Der Velde, Oscar Arnoud
    Atmospheric research
    Date of publication: 2012-07-21
    Journal article

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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

  • El delta de l¿Ebre: mirador privilegiat per a l¿observació de llamps i d¿altres fenòmens elèctrics

     Pineda Ruegg, Nicolau; Montaña Puig, Juan; Van Der Velde, Oscar Arnoud; Romero Duran, David
    SOLDÓ
    Date of publication: 2012-06-27
    Journal article

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  • Des jets géants au-dessus d¿un orage isolé proche de la Réunion

     Soula, Serge; Huet, Patrice; Van Der Velde, Oscar Arnoud; Montaña Puig, Juan; Barthe, Christelle; Bór, József
    La Météorologie
    Date of publication: 2012-05-01
    Journal article

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  • 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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  • Lightning development associated with two negative gigantic jets

     Lu, Gaopeng; Cummer, Steven A.; Lyons, Walter A.; Krehbiel, Paul R.; Li, Jingbo; Rison, William; Thomas, Ronald J.; Edens, Harald E.; Stanley, Mark A.; Beasley, William; MacGorman, Donald R.; Van Der Velde, Oscar Arnoud; Cohen, Morris B.; Lang, Timothy J.; Rutledge, Steven A.
    Geophysical research letters
    Date of publication: 2011-06-21
    Journal article

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    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. In both cases the gigantic jet‐producing flash began as ordinary intracloud lightning with upper level channels attempting to exit the cloud, and then produced the upward gigantic jet. Neither flash had developed channels to ground, confirming that the major charge transfer during gigantic jets occurred between the cloud and ionosphere. The leader progression of one event was detected at altitudes above 20 km, demonstrating the possibility of detecting and tracking the propagation of negative jets above the cloud with VHF techniques.

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    Relativistic electron beams above thunderclouds  Open access

     Fullekrug, Martin; Roussel Dupré, Robert; Symbalisty, Eugene M. D.; Colman, J.J.; Chanrion, Olivier; Soula, Serge; Van Der Velde, Oscar Arnoud; Odzimek, Anna; Bennet, A. J.; Pasko, V.P.; Neubert, Torsten
    Atmospheric chemistry and physics discussions
    Date of publication: 2011
    Journal article

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    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 discharges at heights between ~22–72 km above thunderclouds. Intense positive lightning discharges can also cause sprites which occur either above or prior to the electron beam. One electron beam was detected without any luminous sprite which suggests that electron beams may also occur independently of sprites. Numerical simulations show that beams of electrons partially discharge the lightning electric field above thunderclouds and thereby gain a mean energy of ~ 7MeV to transport a total charge of ~ −10mC upwards. The impulsive current ~3×10−3 Am−2 associated with relativistic electron beams above thunderclouds is directed downwards and needs to be considered as a novel element of the global atmospheric electric circuit.

  • A mediterranean nocturnal heavy rainfall and tornadic event. Part I: overview, damage survey and radar analysis

     Bech Rustullet, Joan; Pineda Ruegg, Nicolau; Rigo, Tomeu; Aran, Montserrat; Amaró, Jésica; Gayà, M; Arús, J; Montaña Puig, Juan; Van Der Velde, Oscar Arnoud
    Atmospheric research
    Date of publication: 2011-01-03
    Journal article

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    This study presents an analysis of a severe weather case that took place during the early morning of the 2nd of November 2008, when intense convective activity associated with a rapidly evolving low pressure system affected the southern coast of Catalonia (NE Spain). The synoptic framework was dominated by an upper level trough and an associated cold front extending from Gibraltar along the Mediterranean coast of the Iberian Peninsula to SE France, which moved north-eastward. South easterly winds in the north of the Balearic Islands and the coast of Catalonia favoured high values of 0-3 km storm relative helicity which combined with moderate MLCAPE values and high shear favoured the conditions for organized convection. A number of multicell storms and others exhibiting supercell features, as indicated by Doppler radar observations, clustered later in a mesoscale convective system, and moved north-eastwards across Catalonia. They produced ground-level strong damaging wind gusts, an F2 tornado, hail and heavy rainfall. Total lightning activity (intra-cloud and cloud to ground flashes) was also relevant, exhibiting several classical features such as a sudden increased rate before ground level severe damage, as discussed in a companion study. Remarkable surface observations of this event include 24 h accumulations exceeding 100 mm in four different observatories and 30 minute rainfall amounts up to 40 mm which caused local flash floods. As the convective system evolved northward later that day it also affected SE France causing large hail, ground level damaging wind gusts and heavy rainfall.

  • The properties of a gigantic jet reflected in a simultaneous sprite: Observations interpreted by a model

     Neubert, Torsten; Chanrion, Olivier; Arnone, E.; Zanotti, Ferruccio; Cummer, Steven A.; Li, Jun; Fullekrug, Martin; Soula, Serge; Van Der Velde, Oscar Arnoud
    Journal of geophysical research
    Date of publication: 2011
    Journal article

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  • Gigantic jets produced by an isolated tropical thunderstorm near Réunion Island

     Soula, Serge; Van Der Velde, Oscar Arnoud; Montaña Puig, Juan; Huet, Patrice; Barthe, Christelle; Bor, Jozsef
    Journal of geophysical research
    Date of publication: 2011
    Journal article

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

     Bech Rustullet, Joan; Pineda Ruegg, Nicolau; Rigo, Tomeu; Aran, Montserrat; Amaró, Jésica; Gayà, M; Arús, J; Montaña Puig, Juan; Van Der Velde, Oscar Arnoud
    Jornades de Meteorologia i Climatologia de la Mediterrània Occidental
    Presentation's date: 2010-03-11
    Presentation of work at congresses

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    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 una important activitat convectiva. El marc i temps sever, igual que en diversos casos anteriors estudiats a la zona (Bech et al. 2007, Aran et al. 2009, Mateo et al. 2009). L’objectiu és documentar les condicions sinòptiques i mesoescalars de l’episodi així com una anàlisi amb dades radar i d’observacions de sinòptic estava dominat per una extens solc, a nivells mitjans i alts, que s’estenia des de Gibraltar al llarg de la costa del llevant peninsular fins al SE de França.

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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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  • Analysis of lightning activity and electromagnetic radiations associated with large TLEs

     Soula, Serge; Van Der Velde, Oscar Arnoud; Montaña Puig, Juan; Fargues, Thomas; Bor, Jozsef; Waysand, Georges
    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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  • Characteristics and conditions of production of TLEs observed over a maritime storm

     Soula, Serge; Palmiéri, J; Chanrion, Olivier; Montaña Puig, Juan; Lefeuvre, F; Van Der Velde, Oscar Arnoud
    AGU Chapman Conference on Effects of Thunderstorms and Lightning in the Upper Atmosphere
    Presentation's date: 2010-05-11
    Presentation of work at congresses

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    The coordinated European campaign of TLE observation in 2007 involved several cameras in southern France and northern Spain and lasted several months of summer, fall, and winter. Thanks to good conditions of observation at the camera locations and to several periods of long-duration storm activity, a large proportion of the TLEs (~90%) were observed from October to January over the Mediterranean Sea. Different types of TLEs (sprites, halos, elves) were produced by these maritime storms.

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

     Romero Duran, David; March Nomen, Victor; Montaña Puig, Juan; 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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    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 subject, students face up to a design and validation of a lightning protection system of an aircraft.

  • Relativistic runaway breakdown in low-frequency radio

     Füllekrug, M.; Roussel Dupré, Robert; Symbalisty, Eugene M. D.; Chanrion, Olivier; Van Der Velde, Oscar Arnoud; Odzimek, Anna; Neubert, Torsten
    Journal of geophysical research
    Date of publication: 2010-01-14
    Journal article

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  • 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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  • Multi-instrumental observations of a positive gigantic jet produced by a winter thunderstorm in Europe

     Van Der Velde, Oscar Arnoud; Bor, Jozsef; Li, Jingbo; Cummer, Steven A.; Arnone, Stefano; Zanotti, Ferruccio; Fullekrug, Martin; Haldoupis, Christos; NaitAmor, Samir; Farges, Thomas
    Journal of geophysical research
    Date of publication: 2010
    Journal article

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  • More evidence for a one-to-one correlation between Sprites and Early VLF perturbations - art. no. A07304

     Haldoupis, Christos; Amvrosiadi, N; Cotts, B. R. T.; Van Der Velde, Oscar Arnoud; Chanrion, Olivier; Neubert, Torsten
    Journal of geophysical research
    Date of publication: 2010-07-10
    Journal article

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  • Characteristics and conditions of production of transient luminous events observed over a maritime storm

     Soula, Serge; Van Der Velde, Oscar Arnoud; Palmierí, J; Chanrion, Olivier; Neubert, Torsten; Montaña Puig, Juan; Gangneron, F; Meyerfeld, Y; Lefeuvre, F; Lointier, G
    Journal of geophysical research
    Date of publication: 2010-07-08
    Journal article

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    On the night of 15/16 November 2007, cameras in southern France detected 30 transient luminous events (TLEs) over a storm located in the Corsican region (France). Among these TLEs, 19 were sprites, 6 were halos, and 5 were elves. For 26 of them, a positive “parent” cloud-to-ground lightning (P+CG) flash was identified. The peak current of the P+CG flashes for the sprites had an average value of 63 kA and had a maximum value of 125 kA. The flashes for the halos and the elves had average values of 272 and 351 kA, respectively, and they had maximum values of 312 and 384 kA, respectively. No TLEs were detected after negative CG flashes with very large peak currents. Among the 26 P+CG flashes, 23 were located in a stratiform region with reflectivity values lower than 45 dBZ. The CG flashes in this region were classified into two groups according to the time interval separating them from the following flash: one group with values less than 2 s and one with values greater than 2 s. About 79% of all CGs were produced in a sequence of at least two flashes less than 2 s apart. For 65.5% of the sequences, the first flash was positive with an average peak current of 73 kA, while the later +CG flashes in a sequence had much lower peak currents. Several triangulated sprites were found to be shifted from their P+CG flashes by about 10 to 50 km and preferentially downstream. The observations suggest that the P+CG flashes can initiate both sprites and other CG flashes in a storm.

    Postprint (author’s final draft)

  • Observations of Western Mediterranean TLE: LS8000 intracloud lightning and high-speed video

     Van Der Velde, Oscar Arnoud; Montaña Puig, Juan; Romero Duran, David; Soula, Serge; Pineda Ruegg, Nicolau; Bech Rustullet, Joan; Reglero, V.
    European Conference on Severe Storms
    Presentation's date: 2009
    Presentation of work at congresses

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    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 halos, elves, jets, gigantic jets, trolls, and palm trees.

  • Total lightning analysis of a tornadic severe weather event

     Pineda Ruegg, Nicolau; Bech Rustullet, Joan; Rigo, Tomeu; Montaña Puig, Juan; Van Der Velde, Oscar Arnoud
    European Conference on Severe Storms
    Presentation's date: 2009
    Presentation of work at congresses

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    This study presents an analysis of total lightning and radar data of a severe weather event that took place in the early morning of 2nd November 2008 in Catalonia (NE Spain). A general overview of the synoptic framework and damage observed, including local flash floods, strong wind gusts and an F2-tornado, is given in a companion study

  • An observational description of a tornadic severe weather event

     Bech Rustullet, Joan; Pineda Ruegg, Nicolau; Aran, M; Amaro, J; Gayà, M; Arús, J; Montaña Puig, Juan; Van Der Velde, Oscar Arnoud
    European Conference on Severe Storms
    Presentation's date: 2009
    Presentation of work at congresses

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    This study presents an analysis of a severe weather case study that took place during the early morning of the 2nd of November 2008, when intense convective activity associated to a rapidly evolving low pressure system affected the southern coast of Catalonia (NE Spain).

  • Spatial and temporal evolution of horizontally extensive lightning discharges associated with sprite-producing positive cloud-to-ground flashes in northeastern Spain

     Van Der Velde, Oscar Arnoud; Montaña Puig, Juan; Soula, Serge; Pineda Ruegg, Nicolau; Bech Rustullet, Joan
    Journal of geophysical research
    Date of publication: 2009
    Journal article

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  • UPC LIGHTNING RESEARCH GROUP UPC-LRG

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

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  • Analysis of thunderstorm and lightning activity associated with sprites observed during the EuroSprite campaigns: Two case studies

     Soula, Serge; Van Der Velde, Oscar Arnoud; Montaña Puig, Juan; Ganot, Michal; Neubert, Torsten; Chanrion, Olivier
    Atmospheric research
    Date of publication: 2009-02
    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.

  • Characteristics ans activity of storms associated with TLEs production during Eurosprite Campaigns: statistics and case studies

     Soula, Serge; Palmiéri, J; Montaña Puig, Juan; Van Der Velde, Oscar Arnoud
    Workshop on Coupling of Thunderstorms and Lightning Discharges to Near-Earth Space
    Presentation's date: 2008-06-23
    Presentation of work at congresses

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  • Total lightning in a TLE-bearing Winter thunderstorm over the Western Mediterranean

     Pineda Ruegg, Nicolau; Van Der Velde, Oscar Arnoud; Montaña Puig, Juan; Soula, Serge
    International Lightning Meteorology Conference
    Presentation's date: 2008-04-24
    Presentation of work at congresses

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    In this paper we present the analysis of one specific thunderstorm, which occurred during the night of 17th to 18th December 2007 in the western Mediterranean Sea, in the coastal area of Catalonia (NE Spain) (Fig.1).

  • Recent Results from Studies of Electrical Discharges in the Mesosphere

     Neubert, T; Rycroft, M; Farges, T; Blanc, E; Chanrion, O; Arnone, E; Odzimek, A; Arnold, N; Enell, C-F; Turunen, E; Bösinger, T; Mika, A; Haldoupis, C; Steiner, R; Van Der Velde, Oscar Arnoud; Soula, S; Berg, P; Boberg, F.; Thejll, P; Christiansen, B.; Ignoccolo, M.; Füllekrug, M.; Verronen, P.T.; Montaña Puig, Juan; Crosby, N
    Surveys in geophysics
    Date of publication: 2008-01
    Journal article

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  • Analysis of lightning associated with a sprite displaced from its parent positive cloud to ground lightning flash

     Montaña Puig, Juan; Van Der Velde, Oscar Arnoud; Soula, Serge; Neubert, Torsten; Bech Rustullet, Joan; Mika, Agnes
    European Geosciences Union General Assembly
    Presentation's date: 2007-04-15
    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.

  • Analysis of thunderstorms and lightning activity associated with sprites observed during the Eurosprite campaigns: two case studies

     Soula, Serge; Montaña Puig, Juan; Van Der Velde, Oscar Arnoud; Mika, Agnes; Haldoupis, Christos; Neubert, Torsten; Ganot, Michael; Labbouz, Laurent
    International Conference on Atmospheric Electricity
    Presentation's date: 2007-08-13
    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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