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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.)

Optical observation of needles in upward lightning flashes

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Saba, Marcelo M. F. [1] ; de Paiva, Amanda R. [1] ; Concollato, Luke C. [2] ; Warner, Tom A. [3] ; Schumann, Carina [4]
Total Authors: 5
[1] INPE Natl Inst Space Res, Av Astronautas, Sao Jose Dos Campos - Brazil
[2] Univ Oxford, Dept Phys, Oxford - England
[3] ZT Res, Rapid City, SD - USA
[4] Univ Witwatersrand, Sch Elect & Informat Engn, Johannesburg Lightning Res Lab, Johannesburg - South Africa
Total Affiliations: 4
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 10, n. 1 OCT 15 2020.
Web of Science Citations: 0

Why lightning sometimes has multiple discharges to ground is an unanswered question. Recently, the observation of small plasma structures on positive leaders re-ignited the search. These small plasma structures were observed as pulsing radio sources along the positive leader length and were named ``needles{''}. Needles may be the missing link in explaining why lightning flickers with multiple discharges, but this requires further confirmation. In this work we present the first optical observations of these intriguing plasma structures. Our high-speed videos show needles blinking in slow motion in a sequential mode. We show that they are formed at unsuccessful leader branches, are as bright as the lightning leaders, and report several other optical characteristics. (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