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Analysis on the Lightning Flash Activities Over Beijing Area Based on Beijing Lightning Network
The temporal and spatial distribution characteristics of lightning activity in Beijing area were statistically analyzed by using the flash lightning data obtained by Beijing Lightning Location Network (BLNET) during 146 thunderstorms in 2015-17. The results showed that most of the 588,520 lightning flashes observed were cloud flashes (IC), which accounted for about 93.8% of the total lightning. Ground-flashes (CG) accounted for only a small fraction, accounting for only 16.2% of the total flashes. 11.7% of these CG flashes are positive flashes. The daily change in lightning activity is clearly a double-peak structure. The two peak periods are 14:00-22:00 (Beijing time, BST) and 23:00-the next day at 03:00. Through the analysis of the total lightning activity density, it is found that the lightning activity has inter-annual differences, but from the average of three years, there are several obvious high-value centers in the lightning activities in Beijing, mainly located in the northeast of Shunyi District, Beijing urban areas and the junction of Shunyi-Tongzhou-Beijing urban areas, the high value area of lightning density is closely related to dense population, heavy traffic and aerosol density.