Lateral Negative Re‐Discharges on the Negative Leader in a Positive Cloud‐to‐Ground Lightning Flash
Abstract Negative‐polarity lateral discharges on pre‐ionized negative channels during a positive cloud‐to‐ground lightning flash were captured by very high frequency interferometric observations. Prior to the return stroke (RS), as the positive leader (PL) advanced steadily and the negative leader (NL) weakened, flickering lateral re‐discharges with small scale, resembling needles on PLs, propagated toward the NL tip at approximately 8.0 × 10 4 m/s. Unlike needles concentrated near PL tips, these re‐discharges occurred along nearly the entire horizontal negative channel. Following the RS, both fast discharges along existing negative channels and new lateral discharges breaking into virgin air were observed, rapidly extending the negative channels and sustaining the continuing current. These re‐discharges appeared to be closely linked to channel potential variations: gradual potential changes before the RS reactivation preceded negative branches, while abrupt potential jumps after the RS initiation triggered intense axial and lateral discharges.
Authors
- Mingyuan Liu (ORCID: https://orcid.org/0000-0003-4391-3929)
- Chunfa Sun
- Xiushu Qie (ORCID: https://orcid.org/0000-0003-2956-3790)
- Ruiling Chen
- Shanfeng Yuan (ORCID: https://orcid.org/0000-0002-6172-4585)
- Dongxia Liu (ORCID: https://orcid.org/0000-0002-8555-9393)
- Huimin Lyu
- Zhuling Sun (ORCID: https://orcid.org/0000-0001-7418-631X)
- Xu Chen (ORCID: https://orcid.org/0000-0002-0521-3182)
- Yu Wang (ORCID: https://orcid.org/0000-0002-5501-2725)
- Fengquan Li (ORCID: https://orcid.org/0000-0003-4258-9143)
- K. Zhu (ORCID: https://orcid.org/0000-0003-0048-1134)
- Lei Wei (ORCID: https://orcid.org/0009-0000-6449-4239)
- Jinliang Li (ORCID: https://orcid.org/0000-0002-2200-5123)
- YiXi QuZhen
- Nima Chuduo
Institutions
- Chinese Academy of Sciences (CN)
- Hebei Meteorological Bureau (CN)
- Guizhou Electric Power Design and Research Institute (CN)
- Institute of Atmospheric Physics (CN)
- University of Chinese Academy of Sciences (CN)
- China Electric Power Research Institute
Publication Details
- Journal
- Geophysical Research Letters
- Published
- 2025-10-22
- DOI
- https://doi.org/10.1029/2025gl117167
- Citations
- 1
- Primary Topic
- Lightning and Electromagnetic Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 1.15
Funders
- National Natural Science Foundation of China
- Chinese Academy of Sciences