Nonlinear Decay of Alfvén Waves Driven by Interplaying Two- and Three-dimensional Nonlinear Interactions

doi:10.3847/1538-4357/aab555

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	Nonlinear Decay of Alfvén Waves Driven by Interplaying Two- and Three-dimensional Nonlinear Interactions
	Zhao,J. S.1,2; Voitenko,Y.3; Keyser,J. De 3; Wu,D. J.1
刊名	The Astrophysical Journal
	2018-04-11
卷号	857 期号:1
关键词	instabilities magnetohydrodynamics (MHD) plasmas solar wind waves
ISSN号	0004-637X
DOI	10.3847/1538-4357/aab555
英文摘要	Abstract We study the decay of Alfvén waves in the solar wind, accounting for the joint operation of two-dimensional (2D) scalar and three-dimensional (3D) vector nonlinear interactions between Alfvén and slow waves. These interactions have previously been studied separately in long- and short-wavelength limits where they lead to 2D scalar and 3D vector decays, correspondingly. The joined action of the scalar and vector interactions shifts the transition between 2D and 3D decays to significantly smaller wavenumbers than was predicted by Zhao et al. who compared separate scalar and vector decays. In application to the broadband Alfvén waves in the solar wind, this means that the vector nonlinear coupling dominates in the extended wavenumber range 5?×?10?4???ρik0⊥???1, where the decay is essentially 3D and nonlocal, generating product Alfvén and slow waves around the ion gyroscale. Here ρi is the ion gyroradius, and k0⊥ is the pump Alfvén wavenumber. It appears that, except for the smallest wavenumbers at and below in Channel I, the nonlinear decay of magnetohydrodynamic Alfvén waves propagating from the Sun is nonlocal and cannot generate counter-propagating Alfvén waves with similar scales needed for the turbulent cascade. Evaluation of the nonlinear frequency shift shows that product Alfvén waves can still be approximately described as normal Alfvénic eigenmodes. On the contrary, nonlinearly driven slow waves deviate considerably from normal modes and are therefore difficult to identify on the basis of their phase velocities and/or polarization.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-857-1-AAB555
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/35606]
专题	中国科学院国家天文台
作者单位	1.Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China; js_zhao@pmo.ac.cn 2.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Beijing 100012, People's Republic of China 3.Solar-Terrestrial Centre of Excellence, Space Physics Division, Belgian Institute for Space Aeronomy, Avenue Circulaire 3, B-1180 Brussels, Belgium
推荐引用方式 GB/T 7714	Zhao,J. S.,Voitenko,Y.,Keyser,J. De,et al. Nonlinear Decay of Alfvén Waves Driven by Interplaying Two- and Three-dimensional Nonlinear Interactions[J]. The Astrophysical Journal,2018,857(1).
APA	Zhao,J. S.,Voitenko,Y.,Keyser,J. De,&Wu,D. J..(2018).Nonlinear Decay of Alfvén Waves Driven by Interplaying Two- and Three-dimensional Nonlinear Interactions.The Astrophysical Journal,857(1).
MLA	Zhao,J. S.,et al."Nonlinear Decay of Alfvén Waves Driven by Interplaying Two- and Three-dimensional Nonlinear Interactions".The Astrophysical Journal 857.1(2018).