[M-IS27] Atmospheric electricity: Applications toward natural disaster mitigation

[MIS27-06] Lightning charge moment changes deduced from highly sensitive ELF magnetic field observations in Southeast Asia

*Yasuhide Hobara¹, Amir Izzani Mohamed², Chandima Gomes³, Wan Ismail Bin Ibrahim², Zulkurnain Abdul-Malek⁴, Syahrun Nizam⁵, Michael Stock⁶, Kazuo Shiokawa⁷, Hiroshi Kikuchi¹, Takuo T. Tsuda¹ (1.Graduate School of Information and Engineering Department of Communication Engineering and Informatics, The University of Electro-Communications, 2.University of Malaysia Pahang Pekan, Malaysia, 3.University of the Witwatersrand Johannesburg, South Africa, 4.Universiti Teknologi Malaysia Johor Bahru, Malaysia, 5.University Malaysia Perlis Perlis, Malaysia, 6.EarthNetworks, Inc. Germantown, USA, 7.Nagoya University, Nagoya, Japan)

Keywords:Lightning, ELF (Extremely Low Frequency), Charge Moment Changes

In 2018 we established the new permanent observation site in Pahang, Malaysia and started continuous recording of horizontal magnetic waveforms in the Extremely Low Frequency (ELF) band by using high sensitivity search coils. We carried out test measurements at four different locations in Malay peninsula and found out that Pahang is the most electromagnetically quiet place for measurement. Initial results indicate a very good performance registering clear waveforms from lightning discharges. We successfully estimated individual lightning charge moment changes (CMCs) with a small lower bound (~few Ckm) with a lightning location data from total lightning network indicative of deducing spatial and temporal dependence of lightning with CMC over Southeast Asia region.