2017 Fiscal Year Final Research Report
Generation processes of spectral anisotropy of turbulence by magnetohydrodynamic waves in the solar wind
| Project/Area Number |
15K17770
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | University of Toyama |
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Principal Investigator |
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| Research Collaborator |
SEOUGH Jungjoon 富山大学, 人間発達科学部, 外国人特別研究員
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | 太陽風 / 磁気流体乱流 / アルヴェン波 |
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| Outline of Final Research Achievements |
The purpose of the present study is to discuss contributions of nonlinear evolution of Alfven waves to generation of developed magnetohydrodynamic turbulence in the solar wind plasma. We derived a theoretical model including both ion acoustic waves and ion kinetic effects and carried out direct numerical simulations of the resultant model. Numerical results show that ion Landau damping effects suppress the excitation of obliquely propagating daughter waves. On the other hand, obliquely propagating waves can be dominant, since ion cyclotron damping suppress the growth of parallel higher wavenumber modes. We also indicated thermodynamic properties including effects of wave dynamics in the coarse-grained scale / ion kinetic effects.
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| Free Research Field |
宇宙プラズマ物理学
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