强激光与粒子束2013，Vol.25Issue(3)：699-703,5.DOI:10.3788/HPLPB20132503.0699
斜向通道雷电电磁场远场近似特性
Approximate characteristics of far-field lightning electromagnetic field from oblique discharge channel
摘要
Abstract
In order to make the calculation of lightning electromagnetic field closer to the actual status and simulate the lightning electromagnetic field in far zone, the analytical expressions of lightning electromagnetic field generated by oblique channel were derived with the dipole method, and the approximate relationships of lightning electromagnetic field and its derivative to channel-base current were obtained after approximate treatment of the exact analytical expressions for lightning electromagnetic field in far area. The waveforms of lightning electromagnetic field and its derivative from the exact and approximate results were compared based on the specified channel-base current described by a pulse function. The result shows that the difference between the exact and approximate waveforms decreases with the increase of the distance, and the applicable range for the approximate expressions of lightning electromagnetic field is stricter than that of the electromagnetic field derivative. The above result verifies the credibility of the approximate expressions, and provides the theoretical basis for the simulation of lightning electromagnetic fields in far zone.关键词
雷电回击电磁场/斜向放电通道/偶极子法/特性分析/远场区/回击模型Key words
lightning return stroke electromagnetic field/ oblique discharge channel/ dipole method/ characteristic-analysis/ far area/ return stroke model分类
天文与地球科学引用本文复制引用
王晓嘉,陈亚洲,万浩江,王琳..斜向通道雷电电磁场远场近似特性[J].强激光与粒子束,2013,25(3):699-703,5.基金项目
国家自然科学基金项目(51077132) （51077132）
