• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

高エネルギー宇宙線による太陽磁場変動の研究

Research Project

Project/Area Number 11203203
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionKonan University

Principal Investigator

山本 嘉昭  甲南大学, 理工学部, 教授 (70068112)

Co-Investigator(Kenkyū-buntansha) 坂田 通徳  甲南大学, 理工学部, 教授 (60068111)
梶野 文義  甲南大学, 理工学部, 教授 (50204392)
西沢 正己  国立情報学研究所, 人間・社会情報研究系, 助教授 (00281585)
Project Period (FY) 1999 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2003: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
KeywordsTeV領域宇宙線 / 太陽活動極大期 / 太陽の影のずれ / 太陽双極子磁場 / 太陽風 / 惑星間磁場 / 地磁気効果 / TeV領域宇宙船 / 地磁場効果
Research Abstract

太陽の影の変動を観測して11年周期の太陽活動に伴う太陽周辺磁場の時間変動を明らかにするため、チベット実験グループはこれまで15m間隔に並べていた検出器アレイに1999年秋と2002年秋に計約500台、2003年に周辺にも検出器を増設して7.5m間隔の濃密アレイで観測している。
1996〜97年頃は太陽活動極小期で太陽双極子磁場は地磁気と逆方向で、10TeV宇宙線による"太陽の影"は丁度太陽の方向にあったことがチベット実験で確認された。これらは、COSPAR、ICRCなどの国際会議で報告し、ApJにも掲載され、シミュレーションでも再現できている。
1998年と1999年のデータからは、太陽は1998年に活動期(サイクル23)に入り、面白いことに"太陽の影"が10TeVで浅くなり始めた。1999年には更に浅くなり、2000年には影が殆ど消え、2001年には少し現われた。2002年前半のデータでは再び影が浅くなったが、後半からは太陽活動が下降に転じて影が現われはじめた。2003年以降は下降期が続いていて、影の消長は濃密アレイによって可能になった3TeV宇宙線では強調されて観測されている。
太陽磁場の反転は2000年から2001年に起きたと思われる。影の消長は黒点数の変化とよい相関がある。当初、少なくとも3ケ月毎に影の位置が定まり、その移動の様子が分かると考えていたが、影が非常に薄れたため6〜8カ月間のデータを蓄積しないと捉えられないのは予想外であった。
しかし、逆に太陽活動の最盛期に伴う磁場の逆転期には双極子磁場は大きく崩れることが判明した。最盛期にはGnevyshev Gapと呼ばれる黒点数の極小が現われ、年毎の解析では"太陽の影"が深くなって良い相関があるが、3カ月単位での解析では相関は微妙である。
現在の状況からすると2006年〜2007年の静穏期には太陽双極子磁場と地磁気の極性がそろうと予想され、1996〜1997年と対照的に"太陽の影"は地磁気効果の倍ほど西にずれることが予想される。その時間的移動の様子が数カ月単位で見えてくると期待している。

Report

(6 results)
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (32 results)

All 2003 2002 2001 2000 1999 Other

All Journal Article (7 results) Publications (25 results)

  • [Journal Article] Sun Shadow in the Solar Activity Cycle 23 Observed with the Tibet Air Shower Array2003

    • Author(s)
      M.Amenomori et al.(発表者:西沢正己)
    • Journal Title

      Proc.28th Int.Cosmic Ray Conf., Tsukuba vol.7

      Pages: 4061-4064

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 銀河宇宙線がつくる"太陽の影"と太陽活動2002

    • Author(s)
      湯田利典
    • Journal Title

      天文月報 95・8

      Pages: 391-398

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Sun's shadow in a high state of solar activity detected with the Tibet air shower array2001

    • Author(s)
      M.Amenomori et al.(発表者:西沢正己)
    • Journal Title

      Proc.27th Int.Cosmic Ray Conf., Hamburg vol.9

      Pages: 3795-3798

    • Related Report
      2004 Annual Research Report
  • [Journal Article] A study of the shadowing of galactic cosmic rays by the Sun in a quiet phase of solar activity with the Tibet air shower array2000

    • Author(s)
      M.Amenomori et al.(The Tibet ASγ Collaboration)
    • Journal Title

      Astrophysical Journal vol.541

      Pages: 1051-1058

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Sun's shadow by 10 TeV cosmic rays under the infuluence of the solar activity1999

    • Author(s)
      M.Amenomori et al.(The Tibet ASγ Collaboration)
    • Journal Title

      Advances in Space Research vol.23

      Pages: 611-615

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Simulation of the Sun Shadow by Cosmic-Ray Particles Traveling through the Solar, Interplanetary and Geomagnetic Fields1999

    • Author(s)
      Y.Suga, N.Hotta, F.Kajino, M.Sakat, T.Sasaki, Y.Yamamoto, T.Yuda
    • Journal Title

      Proc.of 26th Intl.Cosmic Ray Conf., Salt Lake City vol.7

      Pages: 202-205

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Observation of the Sun's Shadow by High Energy Cosmic Rays in a Quiet Phase of Solar Activity1999

    • Author(s)
      M.Amenomori et al.(発表者:西沢正己)
    • Journal Title

      Proc.of 26th Intl.Cosmic Ray Conf., Salt Lake City vol.7

      Pages: 206-209

    • Related Report
      2004 Annual Research Report
  • [Publications] M.Amenomori et al.(発表者:西沢正己): "Sun Shadow in the Solar Activity Cycle 23 Observed with the Tibet Air Shower Array"Proc.28th Int.Cosmic Ray Conf., Tsukuba. vol.7. 4061-4064 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Amenomori et al.(発表者:西沢正己): "Sun's shadow in a high state of solar activity detected with the Tibet air shower array"Proc.27th Int.Cosmic Ray Conf., Hamburg. vol.9. 3795-3798 (2001)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Amenomori et al.(The Tibet ASγ Collaboration): "A study of the shadowing of galactic cosmic rays by the Sun in a quiet phase of solar activity with the Tibet air shower array"Astrophysical Journal. vol.541. 1051-1058 (2000)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Amenomori et al.(The Tibet ASγ Collaboration): "Sun's shadow by 10 TeV cosmic rays under the infuluence of the solar activity"Advances in Space Research. vol.23. 611-615 (1999)

    • Related Report
      2003 Annual Research Report
  • [Publications] Y.Suga, N.Hotta, F.Kajino, M.Sakata, T.Sasaki, Y.Yamamoto, T.Yuda: "Simulation of the Sun Shadow by Cosmic-Ray Particles Traveling through the Solar, Interplanetary and Geomagnetic Fields"Proc.of 26th Intl.Cosmic Ray Conf., Salt Lake City. vol.7. 202-205 (1999)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Amenomori et al.(発表者:西沢正己): "Observation of the Sun's Shadow by High Energy Cosmic Rays in a Quiet Phase of Solar Activity"Proc.of 26th Intl.Cosmic Ray Conf.Salt Lake City. vol.7. 206-209 (1999)

    • Related Report
      2003 Annual Research Report
  • [Publications] 湯田利典: "銀河宇宙線がつくる"太陽の影"と太陽活動"天文見報. 95巻8号. 391-398 (2002)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Amenomori et al.(発表者:西沢正己): "Sun S shadow in a high state of solar activity detected with the Tibet air shower array"Proc. 27th Int. Cosmic Ray Conf., Hamburg. Vol.9. 3795-3798 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Amenomori et al.(The Tibet ASγ Collaboration): "A study of the shadowing of galactic cosmic rays by the Sun in a quiet phase of solar activity with the Tibet air shower array"Astrophysical Journal. vol.541. 1051-1058 (2000)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Amenomori et al.(The Tibet ASγ Collaboration): "Sun's shadow by 10 TeV cosmic rays under the infuluence of the solar activity"Advances in Space Research. vol.23. 611-615 (1999)

    • Related Report
      2002 Annual Research Report
  • [Publications] Y.Suga, N.Hotta, F.Kajino, M.Sakata T.Sasaki, Y.Yamamoto, T.Yuda: "Simulation of the Sun Shadow by Cosmic-Ray Particles Traveling through the Solar, Interplanetary and Geomagnetic Fields"Proc. of 26th intl. Cosmic Ray Conf., Salt Lake City. vol.7. 202-205 (1999)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Amenomori et al.(発表者:西沢正己): "Observation of the Sun's Shadow by High Energy Cosmic Rays in a Quiet Phase of Solar Activity"Proc. of 26th Intl. Cosmic Ray Conf., Salt Lake City. vol.7. 206-209 (1999)

    • Related Report
      2002 Annual Research Report
  • [Publications] 湯田利典: "銀河宇宙線がつくる"太陽の影"と太陽活動"天文月報. 95巻8号. 391-398 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 雨林道紘, 山本嘉昭, 梶野, 坂田, 西沢 他: "SUN'S SHADOW BY 10 TeV COSMIC RAYS UNDER THE INFLUENCE OF SOLAR ACTIVITY"Advances in Space Research. 23・3. 611-615 (1999)

    • Related Report
      2001 Annual Research Report
  • [Publications] 菅 雄一, 山本嘉昭, 梶野, 坂田, 西沢 他: "Simulation of the Sun Shadow by Cosmic-Ray Particles Traveling through the Solar, Interplanetary and Geomagnetic Fields"Proceedings of 26th Intern. Cosmic Ray Conf.. Vol.7. 202-205 (1999)

    • Related Report
      2001 Annual Research Report
  • [Publications] 雨森道紘, 山本嘉昭, 梶野, 坂田, 西沢 他: "Observation of Sun's Shadow by High Energy Cosmic Rays in a Quiet Phase of Solar Activity"Proceedings of 26th Intern. Cosmic Ray Conf.. Vol.7. 206-209 (1999)

    • Related Report
      2001 Annual Research Report
  • [Publications] 雨森道紘, 山本嘉昭, 梶野, 坂田, 西沢 他: "A study of shadowing of galactic cosmic rays by the Sun in a quiet phase of solar activity with the Tibet air shower array"Astrophysical Journal. 541・2. 1051-1058 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] 雨森道紘, 山本嘉昭, 梶野, 坂田, 西沢 他: "Sun's Shadow in a high state of solar activity detected with the Tibet air shower array"Proceedings of 27th Intern. Cosmic Ray Conf.. Vol.9. 3795-3798 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 雨森道紘,山本嘉昭,梶野,坂田,西沢 他: "SUN'S SHADOW BY 10 TeV COSMIC RAYS UNDER THE INFLUENCE OF SOLAR ACTIVITY"Advances in Space Research. 23・3. 611-615 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] 菅雄一,山本嘉昭,梶野,坂田,西沢 他: "Simulation of the Sun Shadow by Cosmic-Ray Particles Traveling through the Solar, Interplanetary and Geomagnetic Fields"Proceedings of 26th Intern.Cosmic Ray Conf.. Vol.7. 202-205 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] 雨森道紘,山本嘉昭,梶野,坂田,西沢 他: "Observation of Sun's Shadow by High Energy Cosmic Rays in a Quiet Phase of Solar Activity"Proceedings of 26th Intern.Cosmic Ray Conf.. Vol.7. 206-209 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] 雨森道紘,山本嘉昭,梶野,坂田,西沢 他: "A study of shadowing of galactic cosmic rays by the Sun in a quiet phase of solar activity with the Tibet air shower array"Astrophysical Journal. 541・2. 1051-1058 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 雨森道紘,山本嘉昭,梶野、坂田、西沢 他: "SUN'S SHADOW BY 10TeV COSMIC RAYS UNDER THE INFLUENCE OF SOLAR ACTIVITY"Advances in Space Research. 23・3. 611-615 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 菅 雄一,山本嘉昭,梶野、坂田、西沢 他: "Simularion of the Sun Shadow by Cosmic-Ray Particles Traveling through the Solar,Interplanetary and Geomagnetic Fields"Proceedings of the 26th Intern.Cosmic Ray Conf.. Vol.7. 202-205 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 雨森道紘,山本嘉昭,梶野、坂田、西沢 他: "Observation of Sun's Shadow by High Energy Cosmic Rays in a Quiet Phase if Solar Avtivity"Proceedings of the 26th Intern.Cosmic Ray Conf.. Vol.7. 206-209 (1999)

    • Related Report
      1999 Annual Research Report

URL: 

Published: 1999-04-01   Modified: 2018-03-28  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi