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Observational study on solar coronal heating using chromospheric magnetic field measurement and deep learning

Research Project

Project/Area Number 20K04019
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 16010:Astronomy-related
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

Okamoto Joten  国立天文台, SOLAR-Cプロジェクト, 助教 (70509679)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsロケット観測 / 太陽 / 彩層 / 磁場 / ゼーマン効果 / 紫外線 / 偏光分光 / 観測ロケット / CLASP2 / 太陽観測衛星 / IRIS / 波動 / 観測ロケット実験 / CLASP2.1 / 太陽彩層 / 偏光分光観測 / 電離マグネシウム線 / 磁場計測 / ハンレ効果 / 散乱偏光 / コロナ加熱 / 機械学習
Outline of Research at the Start

太陽観測研究の主題の 1つ「コロナ加熱問題」の解明に向けて、彩層磁場計測と深層学習を駆使した研究を行う。彩層磁場計測はコロナ加熱に大きく寄与していると考えられている波動の性質の理解に不可欠である。また、その波動は太陽面の磁気活動(場所)ごとに異なる顔を持っており、包括的に理解するには膨大な太陽観測データを用いて波動を検出・解析する必要がある。深層学習はその手段であり、これによって波動の統計的理解を目指す。

Outline of Final Research Achievements

Through the sounding rocket experiments CLASP2 and CLASP2.1 and the analysis of the obtained data, we succeeded in deriving the magnetic field strength at three different altitudes in the solar chromosphere and clarified the three-dimensional structure of the solar chromospheric magnetic field from observations for the first time in the world. After careful analysis and discussion of the usefulness of the time variation of the derived magnetic field, we concluded that the CLASP2 optical system is incapable of detecting changes in the magnetic field strength based on events such as wave motions.

Academic Significance and Societal Importance of the Research Achievements

太陽大気の中でも彩層は非常に活動的な層であり、その磁気的振る舞いが太陽大気における様々な現象の源となっている。よって、彩層の磁場構造を明らかにすることは、地球へも少なからず影響を及ぼすフレアの発生や太陽風の性質を理解することにつながる。今回の成果は、太陽表面からコロナへとつながる未知の磁場構造を解き明かした点、また、我々が開発した観測技術が彩層磁場構造の研究に有効であることを実証した点で画期的である。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (40 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (23 results) Journal Article (6 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 6 results,  Open Access: 4 results) Presentation (10 results) (of which Int'l Joint Research: 9 results,  Invited: 2 results) Remarks (1 results)

  • [Int'l Joint Research] NASA Marshall Space Flight Center/NOAA/NCAR/LMSAL(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Instituto de Astrofisica de Canarias(スペイン)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Institut d’Astrophysique Spatiale(フランス)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Astron. Inst. of Czech Academy of Sci.(チェコ)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] KASI(韓国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research]

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Lockheed Martin/NASA Marshall Space Flight Center/NOAA(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Instituto de Astrofisica de Canarias/Universidad de La Laguna(スペイン)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Institut d’Astrophysique Spatiale(フランス)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] KASI(韓国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Academy of Sciences(チェコ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research]

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] NASA MSFC/NOAA/LMSAL(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] IAS(フランス)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] IAC(スペイン)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Czech Academy of Sciences(チェコ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] KASI(韓国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] NASA Marshall Space Flight Center/NOAA/NCAR/LMSAL(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Instituto de Astrofisica de Canarias(スペイン)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Institut d’Astrophysique Spatiale(フランス)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] University of Oslo(ノルウェー)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Istituto Ricerche Solari Locarno(スイス)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research]

    • Related Report
      2020 Research-status Report
  • [Journal Article] Evidence for the Operation of the Hanle and Magneto-optical Effects in the Scattering Polarization Signals Observed by CLASP2 across the Mg II h and k Lines2023

    • Author(s)
      Ryohko Ishikawa, Javier Trujillo Bueno, Ernest Alsina Ballester, Luca Belluzzi, Tanausu del Pino Aleman, David E. McKenzie, Frederic Auchere, Ken Kobayashi, Takenori J. Okamoto, Laurel A. Rachmeler, Donguk Song
    • Journal Title

      The Astrophysical Journal

      Volume: 945 Issue: 2 Pages: 125-125

    • DOI

      10.3847/1538-4357/acb64e

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Tomography of a Solar Plage with the Tenerife Inversion Code2023

    • Author(s)
      Hao Li, Tanausu del Pino Aleman, Javier Trujillo Bueno, Ryohko Ishikawa, Ernest Alsina Ballester, David E. McKenzie, Frederic Auchere, Ken Kobayashi, Takenori J. Okamoto, Laurel A. Rachmeler, Donguk Song
    • Journal Title

      The Astrophysical Journal

      Volume: 945 Issue: 2 Pages: 144-144

    • DOI

      10.3847/1538-4357/acb76e

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Polarization Accuracy Verification of the Chromospheric LAyer SpectroPolarimeter2022

    • Author(s)
      Donguk Song, Ryohko Ishikawa, Ryouhei Kano, David E. McKenzie, Javier Trujillo Bueno, Frederic Auchere, Laurel A. Rachmeler, Takenori J. Okamoto, Masaki Yoshida, Ken Kobayashi, Christian Bethge, Hirohisa Hara, Kazuya Shinoda, Toshifumi Shimizu, Yoshinori Suematsu, Bart De Pontieu, et al.
    • Journal Title

      Solar Physics

      Volume: 297 Issue: 10

    • DOI

      10.1007/s11207-022-02064-8

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Quiet Sun Center to Limb Variation of the Linear Polarization Observed by CLASP2 Across the Mg II h and k Lines2022

    • Author(s)
      L. A. Rachmeler, J. Trujillo Bueno, D. E. McKenzie, R. Ishikawa, F. Auchere, K. Kobayashi, R. Kano, T. J. Okamoto, C. W. Bethge, D. Song, E. Alsina Ballester, L. Belluzzi, T. del Pino Aleman, A. Asensio Ramos, M. Yoshida, T. Shimizu, A. Winebarger, A. R. Kobelski, G. D. Vigil, B. De Pontieu, N. Narukage, et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 936 Issue: 1 Pages: 67-67

    • DOI

      10.3847/1538-4357/ac83b8

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Mapping solar magnetic fields from the photosphere to the base of the corona2021

    • Author(s)
      R. Ishikawa, J. Trujillo Bueno, T. del Pino Aleman, T. J. Okamoto, D. E. McKenzie, F. Auchere, R. Kano, D. Song, M. Yoshida, L. A. Rachmeler, K. Kobayashi, H. Hara, M. Kubo, N. Narukage, T. Sakao, T. Shimizu, Y. Suematsu, C. Bethge, B. De Pontieu, A. Sainz Dalda, D. V. Genevieve, A. Winebarger et al.
    • Journal Title

      Science Advances

      Volume: 7 Issue: 8 Pages: 8-8

    • DOI

      10.1126/sciadv.abe8406

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Optical design of the Chromospheric LAyer Spectro-Polarimeter (CLASP2)2020

    • Author(s)
      T. Tsuzuki, R. Ishikawa, R. Kano, N. Narukage, D. Song, M. Yoshida, F. Uraguchi, T. J. Okamoto, D. McKenzie, K. Kobayashi, L. Rachmeler, F. Auchere, J. Trujillo Bueno
    • Journal Title

      Proceedings of the SPIE

      Volume: 11444 Pages: 139-139

    • DOI

      10.1117/12.2562273

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Demonstration of Chromospheric Magnetic Mapping with CLASP2.12023

    • Author(s)
      D. McKenzie, R. Ishikawa, J. Trujillo Bueno, F. Auchere, K. Kobayashi, A. Winebarger, R. Kano, D. Song, T. J. Okamoto, A. Kobelski, L. Rachmeler, B. De Pontieu, G. Vigil, L. Belluzzi, E. Alsina Ballester, T. del Pino Aleman, C. Bethge, T. Sakao, J. Stepan
    • Organizer
      54th Meeting of the Solar Physics Division
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Temporal variation of magnetic field strength with CLASP22023

    • Author(s)
      Joten Okamoto
    • Organizer
      CLASP 2.1 Science Meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Challenges to the Solar Coronal Heating Problem by Satellite Observations and Rocket Experiments2023

    • Author(s)
      Joten Okamoto
    • Organizer
      APRIM 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 3D mapping of the magnetic field in the whole atmosphere of an active region plage using spectropolarimetric observations with CLASP2.1 and Hinode2023

    • Author(s)
      R. Ishikawa, D. McKenzie, J. Trujillo Bueno, F. Auchere, D. Song, T. J. Okamoto, R. Kano, K. Kobayashi, A. Kobelski, G. Vigil, A. Winebarger, L. Rachmeler, C. Bethge, E. Alsina Ballester, T. del Pino Aleman, H. Li, B. De Pontieu, L. Belluzzi, T. Sakao, J. Stepan
    • Organizer
      Hinode-16/IRIS-13 science meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Are There Any Differences in the Chromosphere of Coronal Holes and Quiet-Sun ?2023

    • Author(s)
      A. Tei, S. Gunar, J. Okamoto
    • Organizer
      Hinode-16/IRIS-13 science meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The strongest magnetic fields in sunspots and their statistical properties2022

    • Author(s)
      J. Okamoto
    • Organizer
      Solar Polarization Workshop 10
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Demonstration of the mapping of chromospheric magnetic fields by CLASP2.12022

    • Author(s)
      R. Ishikawa, T. J. Okamoto, R. Kano, T. Tsuzuki, F. Uraguchi, D. Song, D. E. McKenzie, K. Kobayashi, G. Vigil, F. Auchere, J. Trujillo Bueno, L. Rachmeler, C. Bethge, T. Sakao, and CLASP2.1 team
    • Organizer
      日本天文学会春季年会
    • Related Report
      2021 Research-status Report
  • [Presentation] Demonstration of Chromospheric Magnetic Mapping with CLASP2.12021

    • Author(s)
      D. E. McKenzie, R. Ishikawa, J. Trujillo Bueno, F. Auchere, K. Kobayashi, A. Winebarger, R. Kano, D. Song, T. J. Okamoto, L. Rachmeler, B. De Pontieu, G. Vigil, L. Belluzzi, E. Alsina Ballester, T. del Pino Aleman, C. Bethge, T. Sakao, J. Stepan
    • Organizer
      Hinode-14 meeting
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] UV Spectro-Polarimetry in the Solar Atmosphere -- Results from Two Sounding Rocket Experiments CLASP1 and CLASP22021

    • Author(s)
      Joten Okamoto
    • Organizer
      IAUS 360: Astronomical Polarimetry -- New Era of Multi-Wavelength Polarimetry
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Initial results of the CLASP2 rocket experiment to measure magnetic fields in the solar chromosphere2020

    • Author(s)
      Joten Okamoto
    • Organizer
      JpGU-AGU Joint Meeting 2020: Virtual
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] 太陽表面からコロナ直下に迫る―太陽観測ロケット実験CLASP2が測定した太陽大気の磁場

    • URL

      https://hinode.nao.ac.jp/news/results/clasp2-publication-202102/

    • Related Report
      2020 Research-status Report

URL: 

Published: 2020-04-28   Modified: 2025-01-30  

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