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Conference Paper

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

Authors

Wu,  Bin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Weitao,  Lyu
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Qi,  Qi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ying,  Ma
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lyuwen,  Chen
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Rakov,  Vladimir
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

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


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017694
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.