| 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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| 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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