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世界最高解像度の計算で迫る太陽活動11年周期の物理機構

Publicly Offered Research

Project AreaSolar-Terrestrial Environment Prediction as Science and Social Infrastructure
Project/Area Number 18H04436
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Research InstitutionChiba University

Principal Investigator

堀田 英之  千葉大学, 大学院理学研究院, 特任助教 (10767271)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2019: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords太陽 / ダイナモ / 熱対流 / 太陽物理学 / 周期活動 / 乱流 / 回転
Outline of Annual Research Achievements

太陽の三次元全球ダイナモ計算を用いて、マウンダー極小期に入るメカニズムの調査を行った。太陽活動は11年の周期を持って変動しているが、1600年代に80年ほど黒点が全く観測されなかったマウンダー極小期があったことが確認されている。現在のダイナモ理論では、ある周期ごとの黒点数の変動は、ランダムに決まる黒点の傾きにより決定されると考えられている。どのような擾乱がある時に、マウンダー極小期のような活動度の低い状況に落ちいるかを自己無撞着な三次元磁気流体計算いよって調査した。
そこで今年度に試したのは、いくつかのパラメータをふり、太陽で実現されているような太陽内部の大規模磁場を実現した上で、大規模磁場に擾乱を与え、どのような擾乱を与えると、大規模磁場により長く影響が出るかを調査した。
今回試したのは、ある時点で, (1) トロイダル磁場をゼロにする場合。(2) トロイダル磁場を反転させる場合。 (3) ポロイダル磁場をゼロにする場合の3パターンを試した。それぞれ(1) 数十日, (2) 1年. (3) 2年ほどで磁場が元のレベルまで復活した。トロイダル磁場に擾乱を与えた場合は、差動回転によるダイナモ効果が強いために、基本的に大きな擾乱とならず。比較的短い時間スケールで元の状態に戻った。一方、ポロイダル磁場に擾乱を与えた場合は、小スケール乱流によりダイナモが実行される必要があるためにより、復活までにより長い時間がかかったと考えられる。

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Report

(2 results)
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (27 results)

All 2020 2019 2018

All Journal Article (8 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 8 results,  Open Access: 5 results) Presentation (19 results) (of which Int'l Joint Research: 9 results,  Invited: 8 results)

  • [Journal Article] On rising magnetic flux tube and formation of sunspots in a deep domain2020

    • Author(s)
      Hotta, H; Iijima, H.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: N/A Issue: 2 Pages: 2523-2537

    • DOI

      10.1093/mnras/staa844

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spontaneous Generation of δ-sunspots in Convective Magnetohydrodynamic Simulation of Magnetic Flux Emergence2019

    • Author(s)
      Toriumi Shin、Hotta Hideyuki
    • Journal Title

      The Astrophysical Journal

      Volume: 886 Issue: 1 Pages: L21-L21

    • DOI

      10.3847/2041-8213/ab55e7

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effect of Morphological Asymmetry between Leading and Following Sunspots on the Prediction of Solar Cycle Activity2019

    • Author(s)
      Iijima H.、Hotta H.、Imada S.
    • Journal Title

      The Astrophysical Journal

      Volume: 883 Issue: 1 Pages: 24-24

    • DOI

      10.3847/1538-4357/ab3b04

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Weak influence of near-surface layer on solar deep convection zone revealed by comprehensive simulation from base to surface2019

    • Author(s)
      Hotta, H; Iijima, H.; Kusano K.
    • Journal Title

      Science Advances

      Volume: 5 Issue: 1

    • DOI

      10.1126/sciadv.aau2307

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Semiconservative reduced speed of sound technique for low Mach number flows with large density variations2019

    • Author(s)
      Iijima H.、Hotta H.、Imada S.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 622 Pages: A157-A157

    • DOI

      10.1051/0004-6361/201834031

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Breaking Taylor-Proudman Balance by Magnetic Fields in Stellar Convection Zones2018

    • Author(s)
      Hotta, H
    • Journal Title

      The Astrophysical Journal

      Volume: 860 Issue: 2 Pages: L24-L24

    • DOI

      10.3847/2041-8213/aacafb

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Asteroseismic detection of latitudinal differential rotation in 13 Sun-like stars2018

    • Author(s)
      Benomar, O.; Bazot, M.; Nielsen, M. B.; Gizon, L.; Sekii, T.; Takata, M.; Hotta, H.; Hanasoge, S.; Sreenivasan, K. R.; Christensen-Dalsgaard, J.
    • Journal Title

      Science

      Volume: 361 Issue: 6408 Pages: 1231-1234

    • DOI

      10.1126/science.aao6571

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Sunspot drawings by Japanese official astronomers in 1749?17502018

    • Author(s)
      Hayakawa Hisashi、Iwahashi Kiyomi、Fujiyama Masashi、Kawai Toshiki、Toriumi Shin、Hotta Hideyuki、Iijima Haruhisa、Imada Shinsuke、Tamazawa Harufumi、Shibata Kazunari
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 70 Issue: 4 Pages: 63-63

    • DOI

      10.1093/pasj/psy066

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Solar convection and dynamo action2020

    • Author(s)
      Hideyuki Hotta
    • Organizer
      Future Directions in Solar, Stellar and Planetary Physics
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Solar dynamo: achievements and perspective2019

    • Author(s)
      Hideyuki Hotta
    • Organizer
      Hinode-13/IPELS
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Solar and stellar dynamo2019

    • Author(s)
      Hideyuki Hotta
    • Organizer
      EASW9
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Solar deep convection zone to surface2019

    • Author(s)
      Hideyuki Hotta, Haruhisa Iijima, Kanya Kusano
    • Organizer
      Space Climate 7
    • Related Report
      2019 Annual Research Report
  • [Presentation] 太陽対流層・コロナ・太陽圏結合モデルに向けて2019

    • Author(s)
      堀田英之
    • Organizer
      PSTEPモデル研究会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 太陽内部熱対流と磁場の数値シミュレーション2019

    • Author(s)
      堀田英之
    • Organizer
      QUCS2019
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 対流層深部からの浮上磁場2019

    • Author(s)
      堀田英之
    • Organizer
      日本流体力学会年会2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 太陽対流層計算2019

    • Author(s)
      堀田英之
    • Organizer
      「京」から「富岳」へ:大規模シミュレーションが拓く惑星科学の未来PS
    • Related Report
      2019 Annual Research Report
  • [Presentation] Flux emergence simulation in a deep domain2019

    • Author(s)
      Hideyuki Hotta
    • Organizer
      Flux emergence workshop 2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] From solar dynamo to formation of sunspot2019

    • Author(s)
      Hideyuki Hotta, Haruhisa Iijima, Kanya Kusano
    • Organizer
      MPPC meeting
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 黒点形成と太陽深部の磁場・熱対流構造の関係2019

    • Author(s)
      堀田英之
    • Organizer
      日本天文学会
    • Related Report
      2018 Annual Research Report
  • [Presentation] First comprehensive calculation of the whole solar convection zone2018

    • Author(s)
      Hideyuki Hotta, Haruhisa Iijima, Kanya Kusano
    • Organizer
      2018 SDO Science Workshop
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Solar and stellar convection and dynamo2018

    • Author(s)
      Hideyuki Hotta, Haruhisa Iijima, Kanya Kusano
    • Organizer
      ITC27 & APPTC2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] High Resolution Simulations of Solar Convection Zone and Dynamo2018

    • Author(s)
      Hideyuki Hotta, Haruhisa Iijima, Kanya Kusano
    • Organizer
      AAPPS-DPP2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Calculation of solar convection zone with the reduced speed of sound technique2018

    • Author(s)
      Hideyuki Hotta, Haruhisa Iijima, Kanya Kusano
    • Organizer
      International Astronomical Union
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 太陽内部と表面をつなぐ 大規模シミュレーション2018

    • Author(s)
      堀田英之
    • Organizer
      SGEPPS
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 黒点の拡散における太陽深部熱対流の影響2018

    • Author(s)
      堀田英之
    • Organizer
      日本天文学会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 太陽の対流層の底から表面までの一貫した計算2018

    • Author(s)
      堀田英之, 飯島陽久, 草野完也
    • Organizer
      日本流体力学会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 太陽の対流層の底から彩層下部までの一貫した初めての計算2018

    • Author(s)
      堀田英之, 飯島陽久, 草野完也
    • Organizer
      日本地球惑星科学連合
    • Related Report
      2018 Annual Research Report

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Published: 2018-04-23   Modified: 2021-01-27  

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