Comparison of peak currents estimated by lightning location system and ground truth references obtained in Morro do Cachimbo station

2012 ◽  
Vol 117 ◽  
pp. 37-44 ◽  
Author(s):  
Cláudia R. de Mesquita ◽  
Rosilene N. Dias ◽  
Silvério Visacro
2016 ◽  
Vol 16 (2) ◽  
pp. 595-605 ◽  
Author(s):  
Wolfgang Schulz ◽  
Gerhard Diendorfer ◽  
Stéphane Pedeboy ◽  
Dieter Roel Poelman

Abstract. In this paper we present a performance analysis of the European lightning location system EUCLID for cloud-to ground flashes/strokes in terms of location accuracy (LA), detection efficiency (DE) and peak current estimation. The performance analysis is based on ground truth data from direct lightning current measurements at the Gaisberg Tower (GBT) and data from E-field and video recordings. The E-field and video recordings were collected in three different regions in Europe, namely in Austria, Belgium and France. The analysis shows a significant improvement of the LA of the EUCLID network over the past 7 years. Currently, the median LA is in the range of 100 m in the center of the network and better than 500 m within the majority of the network. The observed DE in Austria and Belgium is similar, yet a slightly lower DE is determined in a particular region in France, due to malfunctioning of a relevant lightning location sensor during the time of observation. The overall accuracy of the lightning location system (LLS) peak current estimation for subsequent strokes is reasonable keeping in mind that the LLS-estimated peak currents are determined from the radiated electromagnetic fields, assuming a constant return stroke speed. The results presented in this paper can be used to estimate the performance of the EUCLID network related to cloud-to-ground flashes/strokes for regions with similar sensor baselines and sensor technology.


2015 ◽  
Vol 3 (9) ◽  
pp. 5325-5355 ◽  
Author(s):  
W. Schulz ◽  
G. Diendorfer ◽  
S. Pedeboy ◽  
D. R. Poelman

Abstract. In this paper we present a performance analysis of the European lightning location system EUCLID in terms of location accuracy (LA), detection efficiency (DE) and peak current estimation. The performance analysis is based on ground truth data from direct lightning current measurements at the Gaisberg Tower (GBT) and data from E-field and video recordings. The E-field and video recordings were collected in three different regions in Europe, namely in Austria, Belgium, and France. The analysis shows a significant improvement of the LA of the EUCLID network over the past seven years. Currently, the median LA is in the range of 100 m. The observed DE in Austria and Belgium is similar, yet a slightly lower DE is determined in a particular region in France, due to malfunctioning of a relevant lightning location sensor during the time of observation. The overall accuracy of the lightning location system (LLS) peak current estimation for subsequent strokes is reasonable keeping in mind that the LLS estimated peak currents are determined from the radiated electromagnetic fields, assuming a constant return stroke speed. The results presented in this paper can be used to estimate the performance of the EUCLID network for regions with similar sensor baselines and sensor technology.


Fire Safety ◽  
2020 ◽  
Vol 35 ◽  
pp. 54-62
Author(s):  
Yu. Rudyk ◽  
V. Shunkin

Introduction. Thunderstorms in general is produced by atmospherically (climatic) processes, combined with additional hazardous effects. Thus, strong wind, flash flooding and hail causes a long time consequences including damages and injuries. Lightning protection systems are designed and projected in accordance with the requirements of the normative documents, which not always included measures of personal safety and guaranteed absences of injuries. Improving the state of life safety and loss prevention are based on standards and rules, which depend on the results of risk assessment, and investigation of cause’s events. Purpose. The purpose of this article is to analyze this problem in several areas concerning the situation with a systematic approach to the technical regulation in Ukraine of such a sector of life safety as the lightning protection. Methods. Methods of research: calculations using a mathematical model; comparison of the results of the calculation, forecasting of the boundary parameters of the technical condition and monitoring of the lightning location systems properties; examination, qualification, definition of indicators of lightning location system in the composition of the geographical informational system, taking into account laying conditions. Also comparison of different methods for calculating positioning coordinates is given. Results. One of the components of the system lightning protection - the parameters of positioning coordinates of the lightning location system is investigated. The location of lightning strike points is not specified in the applicable fire safety regulations, although this criterion is often used precisely to set fire safety requirements: for buildings, utilities, fire alarm systems, and more. Measures are proposed for implementing test methods and means and incorporating them into standardized technical solutions. In this respect, there can be no claim to the International Electrotechnical Commission and its publications. It is suggested to take into account a number of identified gaps in regulatory documents, relationships between regulators and supervisors, user requests. The analysis of the current normative and technical requirements for the accuracy of coordinates positioning in lightning location systems. On this basis, methods of investigating the causes of events are supplemented, which simplifies the application of impact analysis and the development of protective measures. Conclusion. Determination of the positioning coordinates of lightning stroke is not regulated in the current normative documents on fire safety, although this criterion is often used precisely when establishing requirements for fire safety: to buildings, cable installations, to the installation of fire automatics systems and to others. It is proposed to take advantage of the accuracy in determining the location using mapping geoinformation systems and services in the analysis of indicators of the system of thrust. Conducted theoretical studies of indicators of the lightning location systems have established their relevance for risk assessment methods, measures to prevent losses and to investigate the causes of death, injury to living creatures and other property damage events.


2021 ◽  
Author(s):  
Wuqi Han ◽  
Dandan Zhang ◽  
Hailong Zhao ◽  
Shixun Wei ◽  
Songling Pang ◽  
...  

Atmosphere ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 149 ◽  
Author(s):  
Li Cai ◽  
Xin Zou ◽  
Jianguo Wang ◽  
Quanxin Li ◽  
Mi Zhou ◽  
...  

In the summer of 2013, a three-dimensional (3D)-based Foshan Total Lightning Location System (FTLLS), embedded with differential time of arrival (DTOA) techniques, was installed and started its operation in Foshan, Guangdong Province, China. In this paper, the geographical distribution and set-up information of FTLLS, the estimated locating errors and locating results, as well as its initial operation results are presented. FTLLS consists of nine sub-stations that receive electromagnetic waves associated with lightning discharges and locates VLF/LF (200 Hz–500 kHz) radiation sources in 3D. The remote sub-stations acquired triggered waveforms with a duration of 0.5 ms, a resolution of 12-bits, and a GPS-based sferic time tags of 24 h per day. Cloud-to-ground (CG) lightning events, intra-cloud (IC) lightning events and narrow bipolar events (NBEs) were located by FTLLS. Based on the Monte Carlo simulation, the two-dimensional horizontal location error is basically less than 100 m, and the vertical error (altitude) is less than 200 m when the lightning event occurs within the network. On the other hand, over 14 million lightning strikes were recorded successfully by FTLLS during the period of May to October in 2014, among which IC events, CG events and NBEs accounted for 65%, 34% and 1%, respectively. It is shown that FTLLS is capable of a fine three-dimensional (3D) location, in which the altitude parameters obtained are reasonable and well consistent with observed data in the previous studies. The location results of thunderstorms were additionally verified through simultaneously-observed radar data.


2016 ◽  
Vol 16 (2) ◽  
pp. 607-616 ◽  
Author(s):  
Dieter Roel Poelman ◽  
Wolfgang Schulz ◽  
Gerhard Diendorfer ◽  
Marina Bernardi

Abstract. Cloud-to-ground (CG) lightning data from the European Cooperation for Lightning Detection (EUCLID) network over the period 2006–2014 are explored. Mean CG flash densities vary over the European continent, with the highest density of about 6 km−2 yr−1 found at the intersection of the borders between Austria, Italy and Slovenia. The majority of lightning activity takes place between May and September, accounting for 85 % of the total observed CG activity. Furthermore, the thunderstorm season reaches its highest activity in July, while the diurnal cycle peaks around 15:00 UTC. A difference between CG flashes over land and sea becomes apparent when looking at the peak current estimates. It is found that flashes with higher peak currents occur in greater proportion over sea than over land.


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