| Texto completo | |
| Autor(es): |
Saba, Marcelo M. F.
[1]
;
de Paiva, Amanda R.
[1]
;
Concollato, Luke C.
[2]
;
Warner, Tom A.
[3]
;
Schumann, Carina
[4]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [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
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | SCIENTIFIC REPORTS; v. 10, n. 1 OCT 15 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
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) | |
| Processo FAPESP: | 12/15375-7 - Características dos raios ascendentes no Brasil |
| Beneficiário: | Marcelo Magalhães Fares Saba |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 13/05784-0 - Caracterização dos raios ascendentes a partir de observações de câmeras de alta resolução temporal e medidas de campo elétrico |
| Beneficiário: | Carina Schumann |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |