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In this paper, we analyze the waveform characteristics of 39 clearly identified positive-polarity ground flashes based on broadband electric field measurements obtained from the LOHA lightning observatory in the high altitude area of Lhasa. The study extracted and counted the key characteristic parameters such as slow front time, 10%–90% rise time, half-peak width, zero-crossing duration, opposite polarity duration, slow front to peak percentage, and so on. The results show that the positive ground flashes in Lhasa are significantly different from those in plain areas (e.g., Florida, Japan, Malaysia, and China’s lowland areas) in terms of time domain observations, showing slower rising edge, wider main peak, and longer antipodal pulling tail. This study provides a reference for the characterization of the positive ground flashes in the Tibetan Plateau region and the subsequent analysis of the lightning protection in high elevation areas.

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Characterization of Positive Cloud-to-Ground Flashes Waveforms in Lhasa Area

  • 会议论文

  • 发表日期：

    2026年

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  • Xin Zhang,
  • Zixin Guo,
  • Weidong Shi,
  • Xia Zhao,
  • Tiantian Lu,
  • Xiujuan Chen,
  • Hongliang Zhang

摘要

In this paper, we analyze the waveform characteristics of 39 clearly identified positive-polarity ground flashes based on broadband electric field measurements obtained from the LOHA lightning observatory in the high altitude area of Lhasa. The study extracted and counted the key characteristic parameters such as slow front time, 10%–90% rise time, half-peak width, zero-crossing duration, opposite polarity duration, slow front to peak percentage, and so on. The results show that the positive ground flashes in Lhasa are significantly different from those in plain areas (e.g., Florida, Japan, Malaysia, and China’s lowland areas) in terms of time domain observations, showing slower rising edge, wider main peak, and longer antipodal pulling tail. This study provides a reference for the characterization of the positive ground flashes in the Tibetan Plateau region and the subsequent analysis of the lightning protection in high elevation areas.