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Development of a global and real-time monitoring method for electron density profiles of the lower ionosphere by using the VLF/LF wave propagation

Research Project

Project/Area Number 17K06295
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Power engineering/Power conversion/Electric machinery
Research InstitutionThe University of Electro-Communications

Principal Investigator

Ando Yoshiaki  電気通信大学, 大学院情報理工学研究科, 准教授 (30323877)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords電磁界解析 / VLF/LF帯大地電離圏導波管伝搬 / FDTD法 / 電離圏擾乱 / 電離圏電子密度同定 / 非構造メッシュ時間領域差分法 / PML / 非構造メッシュ / 大地ー電離圏導波管伝搬 / 有限差分時間領域法 / VLF/LF帯電磁波 / 下部電離圏 / 逆問題
Outline of Final Research Achievements

A numerical consideration on a monitoring method of electron density profile in sub-ionospheric layer has been performed. A numerical method to model the VLF/LF earth-ionosphere waveguide propagation was developed. Then, an identification of electron density profile in the sub-ionosphere, which is based on the genetic algorithm, was developed. We verified a validity of our proposed method for the problem where an ionospheric perturbation exists 500km away from a transmitter and observation points are distributed over 1,000km X 100km, and confirmed that the method successfully works with sufficient precision.

Academic Significance and Societal Importance of the Research Achievements

太陽フレアやコロナガス噴射によって地球周囲の電磁環境が擾乱を受け、様々なシステムへ影響を及ぼす。例えば送配電システムの停電、人工衛星の運用停止、無線通信の遮断などが報告されている。この地球周囲の電磁環境観測としては、人工衛星による宇宙天気予報などがあるが、安価で安定的な常時運用システムとしてVLF/LF帯の電磁波伝搬を見ることが候補として存在する。本研究は、どのようなVLF/LF電磁波観測システムを構成すべきなのかということに知見を与えるものである。

Report

(5 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (10 results)

All 2021 2020 2019 2018

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (9 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] An Approximate PML Applied to Cylindrical and Spherical Coordinate Sectors2018

    • Author(s)
      Yoshiaki Ando
    • Journal Title

      IEEE Microw. Wireless Compon. Lett.

      Volume: 28 Issue: 9 Pages: 741-743

    • DOI

      10.1109/lmwc.2018.2853565

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] VLF/LF帯導波管伝搬のFDTDシミュレーションによる電離圏電子密度同定手法の数値解析2021

    • Author(s)
      寺山透星, 安藤芳晃
    • Organizer
      日本大気電気学会第99回研究発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 3次元球座標系FDTD法を用いたVLF/LF帯大地-電離圏導波管伝搬の数値解析2020

    • Author(s)
      寺山透星, 安藤芳晃
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
  • [Presentation] PMC detection in Himawari-8 full disk image2020

    • Author(s)
      K. Kawaura, T. T. Tsuda, Y. Hozumi, Y. Ando, K. Hosokawa, H. Suzuki, T. Nakamura, and K. T. Murata
    • Organizer
      ISAR-6
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 3次元球座標系FDTD法を用いたVLF/LF帯大地-電離圏導波管伝搬の数値解析2020

    • Author(s)
      寺山 透星, 安藤 芳晃
    • Organizer
      jpGU-AGU Joint Meeting 2020
    • Related Report
      2019 Research-status Report
  • [Presentation] WLP-FDTD法を用いた地震に伴うULF帯地殻内電磁波伝搬シミュレーション2020

    • Author(s)
      木村 亮太, 安藤 芳晃, 服部 克巳
    • Organizer
      jpGU-AGU Joint Meeting 2020
    • Related Report
      2019 Research-status Report
  • [Presentation] Numerical simulation of ULF/SLF/ELF electromagnetic waves propagating in the lithosphere by using WLP-FDTD method2019

    • Author(s)
      Yoshiaki Ando
    • Organizer
      2019 URSI-Japan Radio Science Meeting
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Polar mesospheric clouds observation from the Himawari geostationary meteorological satellite2019

    • Author(s)
      Y. Hozumi, T. T. Tsuda, K. Kawaura, Y. Ando, K. Hosokawa, H. Suzuki, T. Nakamura, and K. T. Murata
    • Organizer
      AGU Fall Meeting 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] PMC detection method applying to Himawari-8 data2019

    • Author(s)
      K. Kawaura, T. T. Tsuda, Y. Hozumi, Y. Ando, K. Hosokawa, H. Suzuki, T. Nakamura, and K. T. Murata
    • Organizer
      The Tenth Symposium on Polar Science
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 3次元球座標系FDTD法によるVLF/LF帯大地-電離圏導波管伝搬シミュレーション法の開発2019

    • Author(s)
      関根健太, 安藤芳晃
    • Organizer
      日本大気電気学会第97回研究発表会
    • Related Report
      2018 Research-status Report

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Published: 2017-04-28   Modified: 2022-01-27  

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