A self-consistent turbulence model for the long-term solar-activity cycle
| Project/Area Number |
24540228
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 太陽 / 磁場 / ダイナモ / 乱流 / 流れ / 輸送 / 乱流磁気拡散 / リコネクション |
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| Outline of Final Research Achievements |
We focused on the effect of large-scale inhomogeneous flow in turbulent electromotive force, which is currently "misleadingly" supposed to be a functional of the linear combination of the large-scale magnetic field and its spatial derivatives. The flow inhomogeneity in turbulence naturally leads to the cross-helicity (velocity--magnetic-field correlation) effect coupled with the large-scale vortical motions. A simple dynamo model with this cross-helicity effect for the solar-activity cycle was proposed, where the turbulent cross-helicity equation as well as the mean induction equation is solved in a consistent manner. An eigenvalue analysis was performed to derive an equilibrium oscillatory solution. It was confirmed through the analysis that the magnetic-field reversal is caused by the sign reversal of the turbulent cross helicity.
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Report
(4 results)
Research Products
(43 results)
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[Presentation] Turbulent reconnection and dynamo2014
Author(s)
Nobumitsu Yokoi, Katsuaki Higashimori, Masahiro Hoshino
Organizer
US-Japan Workshop on Magnetic Reconnection
Place of Presentation
University of Tokyo，Tokyo，Japan
Year and Date
2014-05-20 – 2014-05-24
Related Report
Invited
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[Presentation] Characteristics of ElectrohydrodynamConvection Driven Turbulence Laboratory Simulation Project of the Solar Convection Zone2013
Author(s)
Ken-ichi Nagaoka, Shinji Yoshimura, Youhei Masada, Yoshiki Hidaka, Nobumitsu Yokoi, Saku Tsuneta, Masahito Kubo, Ryoko Ishikawa, Kenichiro Terasaka, H. Miura
Organizer
12th Asia Pacific Plasma Conference (APPC12)
Place of Presentation
Makuhari, Japan
Related Report
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[Presentation] Basic physics experiment on spontaneous flow generation and turbulent transport in a controlled turbulence2013
Author(s)
Ken-ichi Nagaoka, Shinji Yoshimura, Yoshiki Hidaka, Kenichiro Terasaka, Saku Tsuneta, Nobumitsu Yokoi, Youhei Masada, Masahito Kubo, Ryoko Ishikawa, Hideaki Miura
Organizer
Joint 19th ISHW and 16th RFP workshop
Place of Presentation
Padova, Italy
Related Report
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[Presentation] A New Experimental Approach to Turbulent Transport in Complex Systems2013
Author(s)
Ken-ichi Nagaoka, Shinji Yoshimura, Youhei Masada, Yoshiki Hidaka, Nobumitsu Yokoi, Saku Tsuneta, Masahito Kubo, Ryoko Ishikawa, Kenichiro Terasaka, Hideaki Miura
Organizer
9th Asia Plasma and Fusion Association Conference
Place of Presentation
Gyeongju, Korea
Related Report
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