The polarity reversals in the stars

• Project/Area Number: 26400234
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: Kyoto Sangyo University
• Principal Investigator: NAKAMICHI Akika 京都産業大学, 神山天文台, 研究員 (30356125)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 磁極反転 / 恒星 / マクロ・スピン / 円偏光観測 / 円偏光 / 偏光分光観測 / エネルギー / 磁場 / 実視連星 / ブラックホール / 銀河形成 / 星形成 / 降着率 / 地磁気 / 太陽磁場 / 偏光分光観測装置 / 直線偏光 / パワースペクトル

Outline of Final Research Achievements

In the theoretical research, we have proposed the three-dimensional macro-spin model that describes the essence of the dynamo-effects in planets and stars. This is a generalization of our previous macro-spin model. We have clarified the conditions in which the magnetic poles have high possibility to reverse.　We submitted a paper to a journal.
VESPolA is a high dispersion spectro-polarimeter, mounted on the 1.3m Araki telescope at Koyama Astronomical Observatory of Kyoto Sangyo University. In the device development, we introduced a new circular polarization mode to the VESPolA and raised the resolution from R = 8,000 to R = 25,000. Thus we haveestablished a novel method which enables very efficient data analysis.
In the observational research, ten target stars have been tested, and the long-term observation of the magnetic field polarity for the four targets is now continuing.

Research Products

• [Journal Article] The Very precise Echelle Spectro-Polarimeter on the Araki-telescope (VESPolA) (2015)
  • Author(s): Takayuki Arasaki, Yuji Ikeda, Yoshiharu Shinnaka, Chisato Isose, Akika Nakamichi, Hideyo Kawakita
  • Journal Title: Publications of the Astronomical Society of Japan Volume: online April 14 Pages: 1-19
  • DOI: 10.1093/pasj/psv004
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] The upgrade of a high dispersion spectro-polarimeter, VESPolA: New circular polarimetry mode and extremely high resolution mode (2014)
  • Author(s): Takayuki Arasaki, Yuji Ikeda, Akika Nakamichi, Hideyo Kawakita
  • Journal Title: SPIE Astronomical Telescopes + Instrumentation Volume: 9147 Pages: 914788-914796
  • Acknowledgement Compliant
• [Journal Article] Fate of inflation and the natural reduction of vacuum energy (2014)
  • Author(s): Akika Nakamichi, Masahiro Morikawa
  • Journal Title: Proceeding of 2nd International Conference on New Frontiers in Physics, EPJ Web of Conferences Volume: 71 Pages: 00097-00097
  • Open Access
• [Journal Article] Physics of quantum measurement and its interdisciplinary applications (2014)
  • Author(s): Masahiro Morikawa, Akika Nakamichi
  • Journal Title: Proceeding of 2nd International Conference on New Frontiers in Physics, EPJ Web of Conferences Volume: 71 Pages: 00093-00093
  • Open Access
• [Journal Article] 恒星の磁極反転 (2014)
  • Author(s): 中道晶香、新崎貴之、池田優二
  • Journal Title: 総合学術研究所所報 京都産業大学 Volume: 9 Pages: 211-217
  • NAID: 110009808911
  • Open Access
• [Presentation] 磁極反転を記述する３次元マクロスピンモデル (2018)
  • Author(s): 中道 晶香、國友 有与志、原 哲也
  • Organizer: 日本天文学会
• [Presentation] ブラックホールから銀河へ (2017)
  • Author(s): 森川 雅博、中道 晶香
  • Organizer: 日本物理学会 第72回年次大会（2017年）
  • Place of Presentation: 大阪大学 豊中キャンパス（大阪府豊中市）
  • Year and Date: 2017-03-17
• [Presentation] 原初超巨大ブラックホールと銀河の活動性 (2016)
  • Author(s): 中道 晶香、森川 雅博
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 愛媛大学 城北キャンパス（愛媛県松山市）
  • Year and Date: 2016-09-14
• [Presentation] 磁極反転を記述する高次元スピンモデル (2016)
  • Author(s): 中道 晶香、國友 有与志、原 哲也
  • Organizer: 日本地球惑星科学連合2016年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2016-05-26
• [Presentation] 磁極反転を記述する高次元スピンモデル (2016)
  • Author(s): 國友有与志, 中道晶香, 原哲也
  • Organizer: 日本地球惑星科学連合大会2016
  • Place of Presentation: 幕張メッセ（千葉県・千葉市）
  • Year and Date: 2016-05-26
• [Presentation] 超巨大ブラックホールと銀河の関係 (2016)
  • Author(s): 中道晶香, 森川雅博
  • Organizer: 日本天文学会
  • Place of Presentation: 首都大学東京（東京都・八王子市）
  • Year and Date: 2016-03-14
• [Presentation] 磁極反転を記述する２次元結合スピンモデル (2015)
  • Author(s): 国友 有与志、中道 晶香、原 哲也
  • Organizer: 日本物理学会 第70回年次大会
  • Place of Presentation: 早稲田大学（東京都新宿区）
  • Year and Date: 2015-03-23
• [Presentation] Coupled spin models for magnetic variation of planets and stars (2014)
  • Author(s): Akika Nakamichi
  • Organizer: Seminar on Dynamics in Our Solar System
  • Place of Presentation: Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University（京都府京都市）
  • Year and Date: 2014-10-23
  • Invited
• [Presentation] The upgrade of a high dispersion spectro-polarimeter, VESPolA: New circular polarimetry mode and extremely high resolution mode (2014)
  • Author(s): Takayuki Arasaki, Yuji Ikeda, Akika Nakamichi, Hideyo Kawakita
  • Organizer: SPIE
  • Place of Presentation: Palais des congres de Montreal, Quebec, Canada
  • Year and Date: 2014-06-22 – 2014-06-27