【摘要】 1986年夏季,我们在兰州中川机场附近对雷暴过程中的闪电进行了3站电场、电场变化及声光差的同步观测。本文定量分析了8月3日和4日两次雷暴过程中的7个云闪放电。结果表明,除一个为云中负电荷区和其上部正电荷区之间的放电外,其余都是负电荷区和云下部范围很大的正电荷区之间的放电。放电中心在海拔高度为3.8—6km之间(对应环境温度为7.6—-13.5℃),中和电矩约18—48Ckm。云下部的这种放电现象在文献中还很少见报道。更多还原

【Abstract】 In the summer of 1986,we observed simutaneously at three stations the electric field, thunder and field-change produced by lightning flashes nearby Zhongchuan Airport, Lanzhou. In this paper seven intra-cloud flashes of two storms on August 3 and 4 are analysed quantita-tivey. The results show that only one flash was a discharge between the main negative and the upper positive charge region. The other flashes were all discharges between the main negative charge region and the extensive lower positive charge region. The centers and the dipole moments destroyed by these flashes were at the altitude 3.8-6km(7.6-13.5℃ ) and 18-48 Ckm respectively.These phenomena of intraclouddischarges in the lower part of thunderclouds have rarely been reported in the literature.更多还原