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Challenge for convective conundrum with large-scale numerical simulations

Research Project

Project/Area Number 20K14510
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 16010:Astronomy-related
Research InstitutionChiba University

Principal Investigator

Hotta Hideyuki  千葉大学, 大学院理学研究院, 准教授 (10767271)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Discontinued (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsダイナモ / 熱対流 / 乱流 / 太陽 / 差動回転 / 磁場 / 太陽ダイナモ
Outline of Research at the Start

太陽の熱対流について、最近明らかになっている観測と理論モデル・数値シミュレーションの差異の原因解明への貢献を目指す。この問題は「熱対流の難問(convective conumdrum)」と呼ばれ、太陽物理学の最も重要な問題の一つとなっている。本研究では、富岳を利用した大規模数値シミュレーションによって、問題解決への貢献を目指す。超高解像度の数値計算を行うことによって、太陽内部の磁場・回転・成層の効果をできるだけ精密に取り入れ観測と理論の不整合の原因を探る。

Outline of Final Research Achievements

Although the solar internal structure has been well inferred from previous theory and observations, the resulting thermal convection and differential rotation are inconsistent with observations. This discrepancy was known as the 'convection conundrum.' In this study, large-scale simulations were used to challenge the 'convection conundrum,' and we succeeded in solving the differential rotation aspect. By carrying out calculations using Fugaku, it was revealed that the magnetic field is stronger in the solar interior than previously thought and that this field plays a major role in angular momentum transport.

Academic Significance and Societal Importance of the Research Achievements

太陽は活動的な恒星であり、その活動は磁場により維持されている。太陽の磁場活動を理解するためには、太陽内部の乱流構造を理解する必要があるが、これまでは観測と理論に大きな乖離があり、我々の理解を阻んでいた。今回の研究では、太陽内部を50億点以上で分解するような超大規模シミュレーションに挑戦し、その結果観測と理論の乖離を解決することができた。この成果により、今後、太陽活動の根元に迫るような研究が可能になるだろう。

Report

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

    (25 results)

All 2023 2022 2021 2020

All Journal Article (10 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 10 results,  Open Access: 8 results) Presentation (15 results) (of which Int'l Joint Research: 8 results,  Invited: 8 results)

  • [Journal Article] Generation of Solar-like Differential Rotation2022

    • Author(s)
      Hotta H.、Kusano K.、Shimada R.
    • Journal Title

      The Astrophysical Journal

      Volume: 933 Issue: 2 Pages: 199-199

    • DOI

      10.3847/1538-4357/ac7395

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Mean-field Analysis on Large-scale Magnetic Fields at High Reynolds Numbers2022

    • Author(s)
      Shimada Ryota、Hotta Hideyuki、Yokoyama Takaaki
    • Journal Title

      The Astrophysical Journal

      Volume: 935 Issue: 1 Pages: 55-55

    • DOI

      10.3847/1538-4357/ac7e43

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Impact of subsurface convective flows on the formation of sunspot magnetic field and energy build-up2022

    • Author(s)
      Kaneko Takafumi、Hotta Hideyuki、Toriumi Shin、Kusano Kanya
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 517 Issue: 2 Pages: 2775-2786

    • DOI

      10.1093/mnras/stac2635

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Investigation of the dependence of angular momentum transport on spatial scales for construction of differential rotation2022

    • Author(s)
      Mori K、Hotta H
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 519 Issue: 2 Pages: 3091-3097

    • DOI

      10.1093/mnras/stac3804

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Recurrent Large‐Scale Solar Proton Events Before the Onset of the Wolf Grand Solar Minimum2022

    • Author(s)
      Miyahara Hiroko、Tokanai Fuyuki、Moriya Toru、Takeyama Mirei、Sakurai Hirohisa、Ohyama Motonari、Horiuchi Kazuho、Hotta Hideyuki
    • Journal Title

      Geophysical Research Letters

      Volume: 49 Issue: 5 Pages: 1-8

    • DOI

      10.1029/2021gl097201

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Solar differential rotation reproduced with high-resolution simulation2021

    • Author(s)
      Hotta H.、Kusano K.
    • Journal Title

      Nature Astronomy

      Volume: 5 Issue: 11 Pages: 1100-1102

    • DOI

      10.1038/s41550-021-01459-0

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Relationship between magnetic field properties and statistical flow using numerical simulation and magnetic feature tracking on solar photosphere2021

    • Author(s)
      Takahata K、Hotta H、Iida Y、Oba T
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 503 Issue: 3 Pages: 3610-3616

    • DOI

      10.1093/mnras/stab710

    • Related Report
      2021 Research-status Report 2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Gradual onset of the Maunder Minimum revealed by high-precision carbon-14 analyses2021

    • Author(s)
      Miyahara Hiroko、Tokanai Fuyuki、Moriya Toru、Takeyama Mirei、Sakurai Hirohisa、Horiuchi Kazuho、Hotta Hideyuki
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 5482-5482

    • DOI

      10.1038/s41598-021-84830-5

    • Related Report
      2021 Research-status Report 2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] PSTEP: project for solar?terrestrial environment prediction2021

    • Author(s)
      Kusano Kanya、Ichimoto Kiyoshi、Ishii Mamoru、Miyoshi Yoshizumi、Yoden Shigeo、Akiyoshi Hideharu、Asai Ayumi、Ebihara Yusuke、Fujiwara Hitoshi、Goto Tada-Nori、Hanaoka Yoichiro、Hayakawa Hisashi、Hosokawa Keisuke、Hotta Hideyuki、Hozumi Kornyanat、Imada Shinsuke、Iwai Kazumasa、et al
    • Journal Title

      Earth, Planets and Space

      Volume: 73 Issue: 1 Pages: 159-159

    • DOI

      10.1186/s40623-021-01486-1

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Formation of superstrong horizontal magnetic field in delta-type sunspot in radiation magnetohydrodynamic simulations2020

    • Author(s)
      Hotta H、Toriumi S
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 498 Issue: 2 Pages: 2925-2935

    • DOI

      10.1093/mnras/staa2529

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] 対流層の底から光球までの浮上磁場シミュレーション:黒点対の非対称性生成の要因について2023

    • Author(s)
      堀田英之
    • Organizer
      日本天文学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Current and next-generation simulations in solar physics2022

    • Author(s)
      Hideyuki Hotta
    • Organizer
      The 5th ISEE Symposium
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Solar interior dynamics: Convection and Magnetic field2022

    • Author(s)
      Hideyuki Hotta
    • Organizer
      APPC15
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Solar differential rotation reproduced with high resolution magnetohydrodynamic simulations2022

    • Author(s)
      Hideyuki Hotta
    • Organizer
      ICNSP2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Generation of the solar magnetic field2022

    • Author(s)
      Hideyuki Hotta
    • Organizer
      IAU GA 372
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 大規模シミュレーションで解明した「反太陽型の差動回転は存在しない」可能性2022

    • Author(s)
      堀田英之
    • Organizer
      日本天文学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 超高解像度計算による太陽の表面勾配層、表面極向き子午面流、赤道加速の再現2022

    • Author(s)
      堀田英之
    • Organizer
      日本地球惑星科学連合
    • Related Report
      2022 Annual Research Report
  • [Presentation] Numerical simulation of solar convection zone and magnetic field2021

    • Author(s)
      H. Hotta
    • Organizer
      The 30th International Toki Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] High resolution simulation of solar convection zone in Fugaku2021

    • Author(s)
      H. Hotta
    • Organizer
      AAPPS-DPP2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Radiation Magnetohydrodynamics Simulations of Sunspot Formation with Influence of Deep Thermal Convection2021

    • Author(s)
      H. Hotta
    • Organizer
      AOGS
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Successful reproduction of solar differential rotation in high-resolution calculation2021

    • Author(s)
      H. Hotta
    • Organizer
      SPD meeting
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Correct reproduction of solar differential rotation in high-resolution simulation with Fugaku2021

    • Author(s)
      H. Hotta
    • Organizer
      JpGU Meeting
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 富岳で実現する太陽の超大規模数値シミュレーション2021

    • Author(s)
      堀田英之
    • Organizer
      日本天文学会
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] 差動回転の自転速度・解像度への依存性の調査2021

    • Author(s)
      堀田英之
    • Organizer
      日本天文学会
    • Related Report
      2020 Research-status Report
  • [Presentation] A calculation for the formation of sunspots in an unprecedentedly deep domain2020

    • Author(s)
      Hideyuki Hotta
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2020 Research-status Report

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

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