[M-IS05] New technologies to monitor thunderstorm and severe weather activities

[MIS05-04] Relation between Lightning and Typhoon Activities (Typhoon LAN) in the Western Pacific Region

*佐藤 光輝¹、高橋 幸弘¹、久保田 尚之¹、山下 幸三²、浜田 純一³、Marciano Joel⁴ (1.北海道大学 大学院理学研究院、2.足利大学 工学部、3.首都大学東京 都市環境学部、4.先端科学技術研究所)

キーワード：雷放電活動、台風、直前予測

Recent studies revealed that there is a close relation between the lightning activity and the tropical cyclone intensity, such as the maximum wind velocity and the minimum surface pressure. As many countries in the western Pacific region suffer from the attack of many tropical cyclones (typhoons) and related severe weather events, they have a strong demand to predict the intensity development of these phenomena by means of a cost-effective way. Thus, we started installing the new lightning and weather observation system, named as V-POTEKA, at Guam, Palau, and Manila in the Philippines since September 2017. The lightning observation system consists of a VLF receiver having the sensitivity in the frequency range of 1-5 kHz, an automatic data-processing unit, solar panels, and batteries. Lightning-excited pulse signals detected by the VLF receiver are automatically analyzed by the data-processing unit, and only the extracted information of the trigger time and the pulse amplitude is transmitted to the data server via the 3G data communications. From the V-POTEKA data analysis, we confirmed that there is clear relation between the lightning occurrence number in the typhoon and the maximum wind speed of Typhoon LAN, which is the category-1 weak typhoon. There is ~12-18 h time difference between the peak lightning occurrence number and peak typhoon intensity. At the presentation, we will show the results derived from these lightning observation systems and will present the relation between lightning and typhoon activities more in detail.