[M-IS07] Effects of lightning, severe weather and tropical storms

[MIS07-02] The relationship between CG lightning detected by AVON V-POTEKA and thunderstorm parameters

*Purwadi Purwadi¹、Yukihiro Takahashi²、Mitsuteru Sato²、Hisayuki Kubota²、Kozo Yamashita³ (1.Agency for Assessment and Application for Technology, Jakarta 10340, Indonesia、2.Faculty of Science, Hokkaido University, Sapporo 0600810, Japan、3.Department of Electrical Engineering, Salesian Polytechnic, Tokyo, Japan)

キーワード：cloud to ground lightning, cloud top temperature, cloud top height, rainfall

Cloud to ground (CG) lightning observation networks, namely AVON V-POTEKA, have been established using a 1-40 kHz very low frequency (VLF) receiver. It has been deployed and operated to cover East and South East Asia since 2017. In this study, the CG lightning geolocation estimation of AVON V-POTEKA data is estimated using the time of arrival method and found the best accuracy of ~30 km. The relationship between lightning and thunderstorm cloud parameters over the maritime continent (MC) can be conducted with additional data of the Himawari 8 band 15 (12.4 µm) to provide cloud top temperature (CTT), radiosonde archived data, and the Global Satellite Mapping of Precipitation with gauge adjusted (GSMaP_Gauge) standard V7. Using the statistical method and grid size 0.5° x 0.5º, the relationship between CG lightning and thunderstorm clouds parameters is found in this study. Moreover, the CTT of thunderstorm clouds is found to be less than -30ºC to produce at least 1 CG lightning, which can be detected by AVON V-POTEKA. Both CTT and cloud top height (CTH) shows a logarithmic relationship with the CG lightning with R²=0.95. On the other hand, the relationship between CG lightning and rainfall shows a power relationship with R²=0.92. The relationship between CG lightning and precipitation water area is estimated to be a power relationship.