摘要
本文对1989—1991年3年中40次人工触发闪电试验资料做了初步分析和理论探讨。结果表明:人工触发闪电的条件选择不能仅靠地面电场强度的大小,地面电场随时间的变化率Δz/Δt和闪电活动中心离测站的距离也是十分重要的参量。触发时机应选在声光差小于10—15s的自然闪电的恢复阶段后期,ΔE/Δt值小于50V/m·s,电场值大于4kV/m。人工触发闪电对雷暴特性有一定影响,在短时间内使雷暴闪电频数和闪电引起的电场变化有显著降低。人工触发闪电后闪道附近降雨增大。
We analyze preliminarily 40 experiments of artificially triggered lightning in 1989-1991 and explore theoretically the results in this paper. The results indicate when we choose the condition of artificially triggered lightning, we can not only depend on the ground electric field. The variation rate of ground electric field △E/△t and the distance of lightning activity center to observation station are also very important parameter. The chance of artificially triggered lightning should be chosen in the later stage of natural lightning restoration process which the time of arrival of the thunder is about less than 10 -15s. Meanwhile, △E/△t<50V/m·s and E>4 kV/m. The artificially triggered lightning has influence on the characteristics of thunderstorm. After a artificially triggered lightning, the lightning of thunderstorm and change of electric field caused by lightning decrease within short time, the amount of precipitation increase near the lightning channel.
出处
《高原气象》
CSCD
北大核心
1992年第2期178-185,共8页
Plateau Meteorology
基金
国家自然科学基金资助项目(488024)
关键词
人工
触发闪电
雷暴
电场
影响
Artificially triggered lightning
Electric field
Thunderstorm.
