| 脉冲电晕与地闪负先导梯级性机制模式探讨 |
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| 引用本文： | 苟学强,张义军.脉冲电晕与地闪负先导梯级性机制模式探讨[J].高原气象,2002,21(4):408-413. |
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| 作者姓名： | 苟学强 张义军 |
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| 作者单位： | 1. 西北师范大学物电学院
2. 中国科学院,寒区旱区环境与工程研究所,甘肃,兰州,730000 |
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| 基金项目： | 国家自然科学基金项目 (4 9975 0 0 3 )，中国科学院寒区旱区环境与工程研究所创新项目 (2 10 0 3 7)共同资助 |
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| 摘 要： | 根据新的观测事实，提出了地闪负先导明亮脉冲可能不是被－慢而弱的流光（引路流光）所此导，而是被一快而短暂的电晕（脉冲电晕）所引导的梯级性流光机制的不同观点。由此出发，对流光间歇时间、梯级长度等重要特征参数进行了新的分析；结合对梯级先导辐射特征脉冲产生机制的进一步分析，提出并论证了明亮脉冲的双向传输，通过一个简单的数值模式对梯级过程进行了计算模式，得到了一些与观测特征基本符合的结果。
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| 关 键 词： | 脉冲电晕 地闪 负先导梯级性机制模式 特征脉冲 辐射脉冲 发光脉冲 |
| 文章编号： | 1000-0534(2002)04-0408-06 |
| 修稿时间： | 2001年9月20日 |
Pulse Corona and a New Mechanism of the Negative SteppedLeader in Cloud-to-Ground(CG) Lightning Discharge |
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| GOU Xue qiang,ZHANG Yi jun.Pulse Corona and a New Mechanism of the Negative SteppedLeader in Cloud-to-Ground(CG) Lightning Discharge[J].Plateau Meteorology,2002,21(4):408-413. |
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| Authors: | GOU Xue qiang ZHANG Yi jun |
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| Abstract: | Based on latest observation, we make an assumption that the bright pulse of negative stepped leader in the CG lightning discharge is not initiated by a slow and faint streamer (pilot streamer ), but is initiated by a fast and instant corona (pulse corona). Thus a new conceptual model of stepped leader was proposed and a simple numerical model was set up. The characteristic parameters of streamer time intervals and the stepped length were discussed. The characteristic radiation pulse of stepped leader was explained more clearly and the bidirectional propagation process of the stepped pulse was analyzed. The result is basically agreed with observation. |
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| Keywords: | Negative stepped leader Pulse corona Characteristic pulse Stepping mechanism |
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