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Study of fine spectral structures of solar radio burst by developing a super high-speed digital spectrometer

Research Project

Project/Area Number 16K17813
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Space and upper atmospheric physics
Research InstitutionNagoya University (2017-2018)
National Institute of Information and Communications Technology (2016)

Principal Investigator

Iwai Kazumasa  名古屋大学, 宇宙地球環境研究所, 准教授 (00725848)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords太陽電波 / 電波バースト / 宇宙天気 / FPGA / デジタル分光 / デジタル分光計
Outline of Final Research Achievements

We have developed a digital fast Fourier transform spectrometer made of an analog-to-digital converter (ADC) and a field-programmable gate array (FPGA). High time and spectral resolutions, highly stable spectroscopy, and a wide dynamic range of the spectrometers were demonstrated in a series of laboratory experiments. The developed digital spectrometers were installed in the solar radio telescope of NICT. We detected many fine spectral structures of solar radio bursts from the test observations. These results are summarized in a paper published by the peer-refereed journal.

Academic Significance and Societal Importance of the Research Achievements

本研究で開発したデジタル分光計を搭載した太陽電波望遠鏡は、世界で最も高分解に太陽電波バーストのスペクトル観測が可能となった。本装置を用いて太陽観測を行った結果、太陽電波バースト中に既存装置では分解不可能だった多数のスペクトル微細構造がることを同定した。これらの科学成果は学術的に非常にインパクトが高く、結果が査読誌に掲載された。
開発したデジタル分光計は共同開発企業が製品として販売し、電波天文学はもとより、信号を高速処理する必要のある広い分野で応用が広がっている。

Report

(3 results)
  • 2018 Final Research Report ( PDF )
  • 2017 Annual Research Report
  • 2016 Research-status Report
  • Research Products

    (16 results)

All 2018 2017 2016 Other

All Int'l Joint Research (3 results) Journal Article (6 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 6 results,  Open Access: 5 results) Presentation (7 results) (of which Int'l Joint Research: 2 results)

  • [Int'l Joint Research] National Radio Astronomy Observatory/Air Force Research Laboratory(米国)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] Max Planck Institute(ドイツ)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] 米国国立電波天文台(米国)

    • Related Report
      2016 Research-status Report
  • [Journal Article] OCTAD-S: digital fast Fourier transform spectrometers by FPGA2017

    • Author(s)
      Iwai Kazumasa、Kubo Y?ki、Ishibashi Hiromitsu、Naoi Takahiro、Harada Kenichi、Ema Kenji、Hayashi Yoshinori、Chikahiro Yuichi
    • Journal Title

      Earth, Planets and Space

      Volume: 69 Issue: 1 Pages: 95-95

    • DOI

      10.1186/s40623-017-0681-8

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] ALMA Discovery of Solar Umbral Brightness Enhancement at λ = 3 mm2017

    • Author(s)
      Iwai Kazumasa、Loukitcheva Maria、Shimojo Masumi、Solanki Sami K.、White Stephen M.
    • Journal Title

      Astrophysical Journal Letter

      Volume: 841 Issue: 2 Pages: L20-L20

    • DOI

      10.3847/2041-8213/aa71b5

    • NAID

      120006343669

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Variation of the Solar Microwave Spectrum in the Last Half Century2017

    • Author(s)
      Shimojo Masumi、Iwai Kazumasa、Asai Ayumi、Nozawa Satoshi、Minamidani Tetsuhiro、Saito Masao
    • Journal Title

      The Astrophysical Journal

      Volume: 848 Issue: 1 Pages: 62-62

    • DOI

      10.3847/1538-4357/aa8c75

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Polarization Characteristics of Zebra Pattern in Type IV Solar Radio Bursts.2017

    • Author(s)
      Kaneda K., H.Misawa, K.Iwai, S.Masuda, F.Tsuchiya, Y.Kato and T.Obara,
    • Journal Title

      The Astrophysical Journal

      Volume: 842 Issue: 1 Pages: 1-12

    • DOI

      10.3847/1538-4357/aa74c1

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Observing the Sun with the Atacama Large Millimeter/submillimeter Array (ALMA): High-Resolution Interferometric Imaging2017

    • Author(s)
      Shimojo M.、Bastian T. S.、Hales A. S.、White S. M.、Iwai K.、Hills R. E.、Hirota A.、Phillips N. M.、Sawada T.、Yagoubov P.、Siringo G.、Asayama S.、Sugimoto M.、Brajsa R.、Skokic I.、Barta M.、Kim S.、de Gregorio-Monsalvo I.、Corder S. A.、et al.
    • Journal Title

      Solar Physics

      Volume: 292 Issue: 7 Pages: 87-87

    • DOI

      10.1007/s11207-017-1095-2

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Observing the Sun with the Atacama Large Millimeter/submillimeter Array (ALMA): Fast-Scan Single-Dish Mapping2017

    • Author(s)
      White S. M.、Iwai K.、Phillips N. M.、Hills R. E.、Hirota A.、Yagoubov P.、Siringo G.、Shimojo M.、Bastian T. S.、Hales A. S.、Sawada T.、Asayama S.、Sugimoto M.、Marson R. G.、Kawasaki W.、Muller E.、Nakazato T.、Sugimoto K.、et al.
    • Journal Title

      Solar Physics

      Volume: 292 Issue: 7 Pages: 88-88

    • DOI

      10.1007/s11207-017-1123-2

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] ALMA単面鏡太陽観測のためのビームパタンモデルとデコンボリューション2018

    • Author(s)
      岩井一正, Timothy Bastian , Stephen White, 下条圭美, ALMA太陽観測チーム
    • Organizer
      日本天文学会2018年春季年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] ALMA単面鏡太陽画像のデコンボリューション2018

    • Author(s)
      岩井一正
    • Organizer
      太陽研連シンポジウム「太陽研究の将来展望」
    • Related Report
      2017 Annual Research Report
  • [Presentation] ALMA Discovery of Solar Umbral Brightness Enhancement at λ=3 mm2017

    • Author(s)
      Kazumasa Iwai, M. Loukitcheva, M. Shimojo, S. Solanki, S. White
    • Organizer
      American Geophysical Union Fall Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ALMA Discovery of Solar Umbral Brightening at λ=3 mm2017

    • Author(s)
      Kazumasa Iwai, M. Loukitcheva, M. Shimojo, S. Solanki, S. White
    • Organizer
      Japan Geoscience Union Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ALMAによる黒点暗部増光の発見2017

    • Author(s)
      岩井一正, Loukitcheva Maria,下条 圭美, Solanki Sami, White Stephe
    • Organizer
      日本天文学会2017年秋季年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 汎用デジタル分光装置:OCTAD-S2017

    • Author(s)
      岩井一正, 久保勇樹, 石橋弘光, 直井隆浩, 原田健一, 江間研自, 林由紀, 近廣祐一
    • Organizer
      日本天文学会2017年秋季年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 鹿児島県山川におけるNICT新太陽電波望遠鏡の開発2016

    • Author(s)
      岩井一正、久保勇樹、石橋弘光、直井隆浩、石井守
    • Organizer
      日本SKAコンソーシアム「技術開発」地域会議 in 鹿児島
    • Place of Presentation
      鹿児島大学(鹿児島県・鹿児島市)
    • Year and Date
      2016-12-17
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2022-06-07  

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