JpGU-AGU Joint Meeting 2017

講演情報

[EE] ポスター発表

セッション記号 M (領域外・複数領域) » M-IS ジョイント

[M-IS05] [EE] Thunderstorms and lightning as natural hazards in a changing climate

2017年5月22日(月) 10:45 〜 12:15 ポスター会場 (国際展示場 7ホール)

コンビーナ:佐藤 光輝(北海道大学 大学院理学研究院)、Yoav Yair(Interdisciplinary Center Herzliya)

[MIS05-P07] Monitoring of lightning activity with the combination of radio observation in ELF-VLF band and electrostatic measurement.

*山下 幸三1大矢 浩代2高橋 幸弘3 (1.サレジオ工業高等専門学校・電気工学科、2.千葉大学大学院工学研究科、3.北海道大学・大学院理学院・宇宙理学専攻)

キーワード:lightning discharge, thunderstorm, ELF, VLF, electrostatic field

In the recent, heavy rain and lightning associated with thunderstorm become a representative of severe weather in urban region. Lightning observation has been focused on as an efficient tool to monitor thunderstorm activity.
Main objective of this study is to established methodology for early detection of thunderstorm formation with simple and low-cost system. To observe lightning activity, electromagnetic field radiated from lightning discharge in ELF (Extremely Low Frequency: less than 3 kHz) and VLF (Very Low Frequency: 3-30kHz) bands has been measured. ELF-VLF wave can propagates long distance (more than several hundreds kilometers). Receivers are installed about 100 km apart in the Kanto Plan, Japan to make detection sensitivity to be high.
In this presentation, initial results of the combination of radio observation in ELF-VLF band and electrostatic measurement are summarized. As an electrostatic measurement, flat-plate sensor called as slow antenna is newly developed and installed at Machida, Tokyo. Based on the comparison between electric field data and electrostatic one, detection sensitivity and discharge-type identification of radio observation in ELF-VLF bands is validated.