摘要
利用自制的磁场测量系统对人工触发闪电近距离的静磁场进行了测量,由此反演出的电流特征与同轴分流器的直接电流测量以及静电场、相对光强等的同步测量结果相符合。在此基础上,本文对永登地区人工触发闪电特征进行了分析讨论。永登人工触发闪电是在云下部正电荷作用下,上行先导的激发、传播及随后的连续电流放电过程。利用同步测量的近区电磁场资料和两站同步测量的静电场资料分别计算了先导速度(～10~5m/s)。整个放电过程持续时间为数十毫秒,中和电荷量为几库仑。
Magnetostatic field at the close range of artificially triggered lightning was measured by a magnetic field antenna system. The characteristic of triggered lightning current deduced from the magnetic field antenna system is consistent with that of direct current measurement by coaxial shunt system, electric field charge measurement by slow antenna and relative luminosity measurement by photocell system. Triggered lightning for storms in Yongdeng, Gansu is initiated with the upward going negative leader, under the influence of the dominant lower positive charge of storm, which propagates upwards followed by continuous current process. The speed of leader propagation was calculated from synchronous measurements of close magnetic and electric field and also from synchronous measurements of electric field change at two stations, results being the order of 105m/s. The triggered lightning lasts a few tens of milliseconds with the neutralized change of a few coulombs.
出处
《高原气象》
CSCD
北大核心
1993年第1期67-76,共10页
Plateau Meteorology
基金
国家自然科学基金资助项目(488024)
关键词
触发闪电
天线系统
放电
电流
Triggered lightning
Magnetic field antenna system
Leader process
Continuous current process
Discharge parameters.
