[M-IS27] 大気電気学：大気電気学研究の自然災害軽減への応用

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

*芳原 容英¹、Amir Mohamed²、Chandima Gomes³、Wan Ismail Bin Ibrahim²、Zulkurnain Abdul-Malek⁴、Syahrun Nizam⁵、Michael Stock⁶、塩川 和夫⁷、菊池 博史¹、津田 卓雄¹ (1.電気通信大学　大学院情報理工学研究科、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)

キーワード：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.