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  High‐speed video observations of needles in positive cloud-to-ground lightning flashes

Wu, B., Weitao, L., Qi, Q., Ying, M., Lyuwen, C., Rakov, V. (2023): High‐speed video observations of needles in positive cloud-to-ground lightning flashes, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1867

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017694 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017694_1
Genre: Conference Paper

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 Creators:
Wu, Bin1, Author
Weitao, Lyu1, Author
Qi, Qi1, Author
Ying, Ma1, Author
Lyuwen, Chen1, Author
Rakov, Vladimir1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: High‐speed video data were used to analyze the initiation and propagation of needles and their associated flickering events observed in positive cloud‐to‐ground (+CG) flashes. Needles occurred during the return‐stroke later stage and the continuing current. They initiated near the lateral surface of the positive leader channel and extended almost perpendicular to that channel. Flickering events are recoil type streamers (or leaders) that retrace the channels created by needles. Needles are caused by the radial motion of negative charge from the hot core of the positive‐leader channel into the positive corona sheath surrounding the core, when the core is rapidly recharged (its radial electric field reversed) by the return‐stroke process and during the following continuing current. Needles could evolve into self-propagating negative leaders. Self-propagating negative leaders evolving from needles exhibit stepped development via connection of space stems/leaders to the tips of negative leaders. The occurrence of space stems/leaders and their connection to the tips of needles resulting in the continuous extensions of needle channels play an important role in the evolution of needles into self-propagating negative leaders.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-1867
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -