Optical observation of needles in upward lightning flashes.

Abstract:

: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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Saba MMF,de Paiva AR,Concollato LC,Warner TA,Schumann C

doi

10.1038/s41598-020-74597-6

subject

Has Abstract

pub_date

2020-10-15 00:00:00

pages

17460

issue

1

issn

2045-2322

pii

10.1038/s41598-020-74597-6

journal_volume

10

pub_type

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