Japan Geoscience Union Meeting 2014

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International Session (Oral)

Symbol P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM07_30PM2] Lightning and TLEs and their effects on the lower and middle atmosphere

Wed. Apr 30, 2014 4:15 PM - 5:30 PM 213 (2F)

Convener:*Mitsuteru Sato(Department of Cosmoscience, Hokkaido University), Toru Adachi(Waseda Institute for Advanced Study, Waseda University), Tomoo Ushio(Information and communication engineering department, Osaka University), Yukihiro Takahashi(Department of Cosmosciences, Graduate School of Science, Hokkaido University), Chair:Mitsuteru Sato(Department of Cosmoscience, Hokkaido University), Kozo Yamashita(Dept.Electrical Engineering, Salesian Polytechnic.)

5:15 PM - 5:30 PM

[PEM07-P02_PG] The building of multipoint measurement network for observing electrostatic field changes caused by lightning discharge

3-min talk in an oral session

*Rikuma SAKAI1, Yukihiro TAKAHASHI1, Mitsuteru SATO1, Takeshi KUDO1 (1.Cosmosciences, Hokkaido Univ.)

Keywords:lightning discharge, electrostatic field, multipoint measurement

It's not easy to understand the developing process of thunderstorm only with existing meteorological measurements because of its small spatial scale (less than an order of 1 km) and rapid change of the complicated structure. Electrostatic field under the thundercloud or its predecessor reflects the distribution of electrical charges, which is the result of frictions between ice crystal and hail due to strong vertical wind inside the thundercloud. If we measure the vertical electric field at multipoints on the ground, we could estimate the 3 dimensional distribution or the changes of the distribution of electrical charges, from which we may know the detailed development of thunderstorm. The traditional equipment for atmospheric electrostatic filed measurement is filed-mill sensor, which costs an order of 1 M JPY. In order to increase the number of observing stations, we should reduce the price of the instrument. Here we introduce a thunderstorm observation campaign, carried out in mountain area of Yamanashi prefecture, August 2013.We developed new plate-type electric filed sensor, which costs about 0.2 M JPY or less including recording device and battery for one site.This sensor was placed at seven locations in every 4 km with recording system and GPS clock.As a result, we succeeded to record the electrostatic field changes at the same time in multi points, which occured due to lightning strikes for three days.