The number of strokes per flash measured by JLDN

Japanese Lightning Detection Network (JLDN) operated by Franklin Japan Corporation (FJC) has been provided stroke data as our standard commercial lightning data [1]. However, it is much useful for lightning protection system designs to use flash data rather than using stroke data [2]. Therefore, this paper examines the method of conversion of stroke data into flash data and multiplicities of lightning flashes observed by JLDN. In addition to the above, we also compare our data with other nationwide lightning detection network and discuss the characteristics of flash multiplicity measured by JLDN. The FJC uses the algorithm which is different from the National Lightning Detection Network (NLDN). Therefore, we discuss the validity of the JLDN flash algorithm by comparing flash multiplicities calculated by both the JLDN flash algorithm and the NLDN one. In addition, we compare the flash multiplicities measured by JLDN with those measured by other nationwide lightning detection network and examine the network performance of JLDN regarding the flash multiplicity.