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Role of the solar fine magnetic field structure for solar wind acceleration

Research Project

Project/Area Number 19K23472
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0204:Astronomy, earth and planetary science, and related fields
Research InstitutionNational Institute of Information and Communications Technology

Principal Investigator

Shiota Daikou  国立研究開発法人情報通信研究機構, 電磁波研究所電磁波伝搬研究センター, 研究マネージャー (90462192)

Project Period (FY) 2019-08-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords太陽風 / 太陽磁場 / シミュレーション / ひので / 太陽コロナ / 太陽磁場観測 / 数値シミュレーション / 適合格子法
Outline of Research at the Start

光球の対流運動により光球の磁場分布は時事刻々と変化する。それに応じて上空のコロナが加熱され・太陽風が形成されるが、その様子は大局的な磁場構造によって異なる。これは光球の対流運動で生じるエネルギーが磁場を介して上空に輸送・散逸される過程の性質が磁場の構造分布によって変わるためであるが、具体的な過程は明らかになっていない。本研究では、微細磁場構造がコロナ加熱・太陽風加速に果たす役割を調べるために超高解像度の全球磁気流体力学シミュレーションを行い、光球からのエネルギー輸送と上空での散逸過程が全球規模の磁場分布の違いによってどのように異なるかを明らかにする。

Outline of Final Research Achievements

Hinode observation of Sun's polar regions for Cycle 24 and the rising phase of the Solar Cycle 25, compared with coronal images and solar wind observation derived from Interplanetary scintillation, revealed a correlation among changes of the Sun's global magnetic field, coronal hole shapes in the polar regions where fast solar wind emanates, and distribution of magnetic patches in polar regions. The database for the observation of the magnetic field in the solar polar region was prepared by Hinode, and it was opened to the public in 2022. The importance of the acceleration by wave and turbulence in the fast solar wind was indicated by the comparison with the one dimensional Wave/Turbulence-driven MHD simulation and observation along the magnetic field line.

Academic Significance and Societal Importance of the Research Achievements

コロナ加熱・太陽風加速問題は未だ決着がついていない太陽物理学の最重要課題であるとともに、さらには太陽以外の多様な天体に共通の天体物理学にとっての重要課題でもある。また太陽風は、宇宙天気じょう乱の主要因として私たちの社会にも影響を及ぼす現象である。そのため、高速太陽風の形成過程の解明その分布の予測モデルの精度向上は宇宙天気予報にとって、非常に重要な課題である。本研究では、その理解を進めるためデータとして重要となる太陽の極域磁場観測データを整備するとともに、コロナ加熱・太陽風加速問題における太陽微細磁場構造の役割についての理解を進めた。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (16 results)

All 2024 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (2 results) Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (12 results) (of which Int'l Joint Research: 6 results,  Invited: 2 results) Remarks (1 results)

  • [Int'l Joint Research] Instituto de Astrofisica de Andalucia(スペイン)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Lockheed Martin Solar & Astrophys. Lab./National Center for Atmospheric Research(米国)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Testing the Alfven-wave Model of the Solar Wind with Interplanetary Scintillation2022

    • Author(s)
      Shoda Munehito、Iwai Kazumasa、Shiota Daikou
    • Journal Title

      The Astrophysical Journal

      Volume: 928 Issue: 2 Pages: 130-130

    • DOI

      10.3847/1538-4357/ac581e

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 宇宙天気予報の観点からの太陽圏研究2024

    • Author(s)
      塩田 大幸
    • Organizer
      ISEE研究集会「太陽圏の次世代研究検討会」
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] ひのでで観測されたサイクル24-25の 太陽極域磁場の変動2024

    • Author(s)
      塩田大幸、久保雅仁、勝川行雄、下条圭美、飯島陽久、松本琢磨、増田智
    • Organizer
      日本天文学会 2024年春季年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Hinode observation of long-term variation of magnetic fields in the Sun’s polar regions during Cycle 24-252024

    • Author(s)
      D. Shiota, M. Kubo, Y. Katsukawa, M. Shimojo, H. Iijima, T. Matsumoto, S. Masuda
    • Organizer
      Hinode-17/IRIS-15/SPHERE meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] AbstractInfluence of magnetic filling factor estimation on the polar magnetic fields as observed with Hinode/SOT-SP2023

    • Author(s)
      M. Kubo, D. Shiota, Y. Katsukawa, H. Iijima, S. Masuda, A. Fujimori
    • Organizer
      Hinode-16/IRIS-13 mmeting
    • Related Report
      2023 Annual Research Report
  • [Presentation] MILOSとMERLINインバージョンで導出された太陽極域磁場の比較2023

    • Author(s)
      久保雅仁、塩田大幸、勝川行雄、下条圭美、D. Orozco Suarez、N. Nitta、M. DeRosa、R. Centeno
    • Organizer
      日本天文学会2023年春季年会
    • Related Report
      2022 Research-status Report
  • [Presentation] Comparison of polar magnetic fields derived from MILOS and MERLIN inversion for Hinode/SOT-SP data2022

    • Author(s)
      M. Kubo, D. Shiota, Y. Katsukawa, M. Shimojo, D. Orozco Suarez, N. Nitta, M. DeRosa, R. Centeno
    • Organizer
      The joint Hinode-15 / IRIS-12 meeting
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Comparison of polar magnetic fields derived from MILOS & MERLIN inversion for Hinode/SOT-SP data2022

    • Author(s)
      M. Kubo, D. Shiota, Y. Katsukawa, M. Shimojo, D. Orozco Suarez, N. Nitta, M. DeRosa, R. Centeno
    • Organizer
      Solar Polarization Workshop 10
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Yearly variation of the Sun’s polar regions during Solar Cycle 24 observed with Hinode2021

    • Author(s)
      Shiota, D.; Shimojo M.
    • Organizer
      JpGU Meeting 2021
    • Related Report
      2021 Research-status Report 2020 Research-status Report
  • [Presentation] ひのでで観測されたサイクル24 中の太陽極域磁場の変動2021

    • Author(s)
      塩田大幸;下条圭美
    • Organizer
      日本天文学会2021年春季年会
    • Related Report
      2020 Research-status Report
  • [Presentation] Hinode Observation of Sun’s Polar Regions over a solar cycle2020

    • Author(s)
      Shiota, D.; Shimojo M.
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Hinode Observation of Sun’s Polar Regions over a solar cycle2020

    • Author(s)
      Daikou Shiota, Masumi Shimojo
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Hinode Observation of Sun’s Polar Regions over a solar cycle2019

    • Author(s)
      Daikou Shiota, Masumi Shimojo
    • Organizer
      Hinode-13/IPELS 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Remarks] Database for Hinode SOT Polar Magnetic Field

    • URL

      https://hinode.isee.nagoya-u.ac.jp/sot_polar_field/

    • Related Report
      2022 Research-status Report

URL: 

Published: 2019-09-03   Modified: 2025-01-30  

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