人工衛星によるVHF帯電磁波を用いた雷放電位置推定に対する電離圏の影響評価

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概要

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• The well-developed thundercloud causes local downpours and tornadoes accompanied with lightning discharges. The remote sensing for lightning discharges from space is useful for the short-term forecast of weather disasters over vast areas, the understanding of global electrical circuit, and so forth. The broadband digital interferometer (DITF) has been already used to study on the lightning activities as ground-based equipment. The DITF makes it possible to visualize lightning channels by VHF radio observations. The goal of the study, in future, is to realize the space borne DITF and to monitor the thunderstorm activities constantly. In 2012, global lightning and sprite measurements (GLIMS) mission is started its observations on exposed facility of Japanese experiment module (JEM-EF) of the international space station (ISS). The very high frequency (VHF) broadband digital interferometer (VITF) attached on JEM-EF is designed to estimate the direction of arrival with about 10 km resolution. This paper discusses the propagation characteristics through the ionosphere of the VHF radio waves with Lightning Discharges. The numerical simulation based on the ray-tracing method in consideration of the electron density in the ionosphere is performed. The electron density in the nighttime ionosphere has an insignificant effect on the propagation path of the VHF waves, while the electron density in the daytime ionosphere causes the distance error between the radiation source and the estimated radiation source using the VITF is greater than several tens of kilometers when the incident angle for the VITF antenna is greater than 60 degrees.

著者

• 森本 健志

  Faculty of Science and Engineering, Department of Electric and Electronic Engineering, Kinki University

• 河崎 善一郎

  Graduate School of Engineering, Division of Electrical, Electronic and Information Engineering, Osaka University

• 吉田 智

  Graduate School of Engineering, Division of Electrical, Electronic and Information Engineering, Osaka University

• 菊池 博史

  Graduate School of Engineering, Division of Electrical, Electronic and Information Engineering, Osaka University

• 牛尾 知雄

  Graduate School of Engineering, Division of Electrical, Electronic and Information Engineering, Osaka University

関連論文

• 人工衛星によるVHF帯電磁波を用いた雷放電位置推定に対する電離圏の影響評価

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