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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

On the Triggering Mechanisms of Upward Lightning

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Schumann, Carina [1, 2] ; Saba, Marcelo M. F. [3] ; Warner, Tom A. [4] ; Ferro, Marco A. S. [5] ; Helsdon, Jr., John H. [4] ; Thomas, Ron [6] ; Orville, Richard E. [7]
Total Authors: 7
[1] Univ Witwatersrand Johannesburg, Sch Geosci, Johannesburg - South Africa
[2] Univ Witwatersrand Johannesburg, Sch Elect & Informat Engn, Johannesburg - South Africa
[3] INPE, Natl Inst Space Res, Sao Jose Dos Campos - Brazil
[4] South Dakota Sch Mines & Technol, Dept Phys, Rapid City, SD - USA
[5] Inst Aeronaut & Space IAE, Atmospher Sci Div, Sao Jose Dos Campos - Brazil
[6] New Mexico Inst Min & Technol, Dept Phys, Socorro, NM - USA
[7] Texas A&M Univ, Dept Atmospher Sci, College Stn, TX - USA
Total Affiliations: 7
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 9, JUL 3 2019.
Web of Science Citations: 0

Upward lightning studies took place in Rapid City, South Dakota, USA and S. Paulo, Brazil during the summer thunderstorm seasons from 2011 to 2016. One of the main objectives of these campaigns was to evaluate and characterize the triggering of upward positive leaders from tall objects due to preceding nearby flash activity. 110 upward flashes were observed with a combination of high-and standard-speed video and digital still cameras, electric field meters, fast electric-field antenna systems, and for two seasons, a Lightning Mapping Array. These data were analyzed, along with correlated lightning location system data, to determine the triggering flash type responsible for the initiation of upward leaders from towers. In this paper, we describe the various processes during flash activity that can trigger upward leaders from tall objects in the USA and in Brazil. We conclude that the most effective triggering component is the propagation of the in-cloud negative leader during the continuing current that follows a positive return stroke. (AU)

FAPESP's process: 12/15375-7 - Characteristics of upward lightning flashes in Brazil
Grantee:Marcelo Magalhães Fares Saba
Support type: Regular Research Grants
FAPESP's process: 13/05784-0 - Upward lightning flash characterization from high-speed camera videos and electric field measurements
Grantee:Carina Schumann
Support type: Scholarships in Brazil - Doctorate