FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2782988454> ?p ?o ?g. }

• W2782988454 abstract "In addition to the general aims of lightning research such as lightning physics and meteorology, the study of upward lightning is of particular importance in protection of tall objects such as wind turbines and telecommunication towers. It also helps us in better understanding the lightning initiation process and its role in the earth- atmosphere electrical balance. Within this context, this thesis presents an analysis on various aspects of upward lightning discharge (negative, positive, bipolar) using experimental observation and theoretical modeling for better understanding of its initial stage, the propagation of its electromagnetic field along irregular terrain and its interaction with the ionosphere. Our investigation on the superimposed impulsive components of the initial stage of upward negative flashes revealed that they can transfer net negative charges to ground by both M-component and return stroke modes of charge transfer, which can be distinguished by their associated electric field signature. Moreover, we investigated the ability of Lightning Location Systems (LLSs) to locate and detect upward negative flashes. Different aspects of upward negative flashes which might affect the evaluation performance of LLSs were discussed. It is found that LLSs tend to overestimate the peak current values of RS pulses of upward negative flashes. Using full-wave numerical simulation, it is demonstrated that this overestimation is mainly due to electric field enhancement by wave propagation along mountainous terrain around Santis Tower. Using simultaneous channel-base current and electric field records of upward positive flashes, we observed that two types of pulsations can be distinguished during the course of progression of upward negative leaders which are very similar to ?Classical PBPs? and ?Narrow PBPs? of the initial stage of downward negative leaders suggesting a general similarity between upward and downward negative leaders. We present and discuss current waveforms associated with 13 bipolar flashes recorded at the Santis Tower during the period from June 2010 to January 2015. We have found two flashes of our data base each characterized by a sequence of two upward leaders of opposite polarity within the same flash, a scenario that has never been reported from previous observations at instrumented towers. The obtained results suggest that the traditional classification of bipolar flashes should be revisited. We present simultaneous channel-base current and wideband electric field waveforms at 380 km distance from the strike point associated with upward flashes initiated from the Santis Tower. The dataset presented in this study represents, to the best of the Author?s knowledge, the first simultaneous records of lightning currents and distant fields associated with natural upward flashes featuring ionospheric reflections. The data are used to infer the characteristics of the ionospheric layers. We present a full-wave 2D FDTD analysis of the field propagation including the effect of the ionospheric reflections and the results are compared with the experimental data. Furthermore, we present a novel semi-analytical simplified approach based on the ray tracing concept to estimate radiated electric fields associated with lightning return strokes, taking into account ionospheric reflections." @default.
• W2782988454 created "2018-01-26" @default.
• W2782988454 creator A5046713650 @default.
• W2782988454 date "2018-01-01" @default.
• W2782988454 modified "2023-09-23" @default.
• W2782988454 title "Characteristics of Upward Lightning Flashes" @default.
• W2782988454 doi "https://doi.org/10.5075/epfl-thesis-7988" @default.
• W2782988454 hasPublicationYear "2018" @default.
• W2782988454 type Work @default.
• W2782988454 sameAs 2782988454 @default.
• W2782988454 citedByCount "0" @default.
• W2782988454 crossrefType "journal-article" @default.
• W2782988454 hasAuthorship W2782988454A5046713650 @default.
• W2782988454 hasConcept C116403925 @default.
• W2782988454 hasConcept C121332964 @default.
• W2782988454 hasConcept C127313418 @default.
• W2782988454 hasConcept C151730666 @default.
• W2782988454 hasConcept C153294291 @default.
• W2782988454 hasConcept C161840515 @default.
• W2782988454 hasConcept C163258240 @default.
• W2782988454 hasConcept C166957645 @default.
• W2782988454 hasConcept C205649164 @default.
• W2782988454 hasConcept C2777831296 @default.
• W2782988454 hasConcept C2779343474 @default.
• W2782988454 hasConcept C39432304 @default.
• W2782988454 hasConcept C58640448 @default.
• W2782988454 hasConcept C60799052 @default.
• W2782988454 hasConcept C62520636 @default.
• W2782988454 hasConcept C69398868 @default.
• W2782988454 hasConcept C8058405 @default.
• W2782988454 hasConceptScore W2782988454C116403925 @default.
• W2782988454 hasConceptScore W2782988454C121332964 @default.
• W2782988454 hasConceptScore W2782988454C127313418 @default.
• W2782988454 hasConceptScore W2782988454C151730666 @default.
• W2782988454 hasConceptScore W2782988454C153294291 @default.
• W2782988454 hasConceptScore W2782988454C161840515 @default.
• W2782988454 hasConceptScore W2782988454C163258240 @default.
• W2782988454 hasConceptScore W2782988454C166957645 @default.
• W2782988454 hasConceptScore W2782988454C205649164 @default.
• W2782988454 hasConceptScore W2782988454C2777831296 @default.
• W2782988454 hasConceptScore W2782988454C2779343474 @default.
• W2782988454 hasConceptScore W2782988454C39432304 @default.
• W2782988454 hasConceptScore W2782988454C58640448 @default.
• W2782988454 hasConceptScore W2782988454C60799052 @default.
• W2782988454 hasConceptScore W2782988454C62520636 @default.
• W2782988454 hasConceptScore W2782988454C69398868 @default.
• W2782988454 hasConceptScore W2782988454C8058405 @default.
• W2782988454 hasLocation W27829884541 @default.
• W2782988454 hasOpenAccess W2782988454 @default.
• W2782988454 hasPrimaryLocation W27829884541 @default.
• W2782988454 hasRelatedWork W1966692662 @default.
• W2782988454 hasRelatedWork W2013310050 @default.
• W2782988454 hasRelatedWork W2014527567 @default.
• W2782988454 hasRelatedWork W2017860260 @default.
• W2782988454 hasRelatedWork W2029853403 @default.
• W2782988454 hasRelatedWork W2033554588 @default.
• W2782988454 hasRelatedWork W2078959318 @default.
• W2782988454 hasRelatedWork W2177292147 @default.
• W2782988454 hasRelatedWork W2336379519 @default.
• W2782988454 hasRelatedWork W2545988838 @default.
• W2782988454 hasRelatedWork W2898188085 @default.
• W2782988454 hasRelatedWork W2898220635 @default.
• W2782988454 hasRelatedWork W2898449159 @default.
• W2782988454 hasRelatedWork W2898487266 @default.
• W2782988454 hasRelatedWork W2898539795 @default.
• W2782988454 hasRelatedWork W2946355162 @default.
• W2782988454 hasRelatedWork W2949477122 @default.
• W2782988454 hasRelatedWork W3002084402 @default.
• W2782988454 hasRelatedWork W3012410282 @default.
• W2782988454 hasRelatedWork W3158856802 @default.
• W2782988454 isParatext "false" @default.
• W2782988454 isRetracted "false" @default.
• W2782988454 magId "2782988454" @default.
• W2782988454 workType "article" @default.