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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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Datensatz-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017694 Versions-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017694_1
Genre: Konferenzbeitrag

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Urheber

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

Inhalt

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Schlagwörter: -
 Zusammenfassung: 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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Sprache(n): eng - Englisch
 Datum: 2023
 Publikationsstatus: Final veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.57757/IUGG23-1867
 Art des Abschluß: -

Veranstaltung

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Titel: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Veranstaltungsort: Berlin
Start-/Enddatum: 2023-07-11 - 2023-07-20

Entscheidung

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Titel: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Genre der Quelle: Konferenzband
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Potsdam : GFZ German Research Centre for Geosciences
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