Equivalent Electrical Discharge Structure of Thunderstorm and Simultaneous Observation of Multi-Station of Cloud Flashes in Zhongchuan of Gansu
Cui Hai-hua · Gaoyuan qixiang · 2009
Using the data from 7-station slow antenna network synchronized by GPS with 1 min resolution during thunderstorms in the neighborhood of Zhongchuan airdrome,Gansu. Through the non-linear least-square solution method,the dipole moment,tropism and location of charges neutralized by ten intracloud lightnings occurred in a thunder storm on August 20,2004 are fitted and analyzed.The results show that five flashes occurred between main negative charge region and lower positive charge region and that other five flashes did between main negative charge region and higher positive charge region during the developing stage of thunderstorm.The center of discharge is between 1.3～3.6 km and 4.8～5.7 km above the ground.The neutralized moment is about 4.56~61.0 C·km and 1.06~15.9 C·km.It confirms that the positive charge exist in the lower part of Chinese inland plateau thunderstorm cloud,and that the positive charge actively takes part in the discharge.The charge structure related to the lightning discharge can be represented with the tripole.