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Nonlinear Decay of Alfven Waves Driven by Interplaying Two- and Three-dimensional Nonlinear Interactions
Zhao, J. S.1,2; Voitenko, Y.3; De Keyser, J.3; Wu, D. J.1
2018-04-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume857Issue:1Pages:12
Abstract

We study the decay of Alfven waves in the solar wind, accounting for the joint operation of two-dimensional (2D) scalar and three-dimensional (3D) vector nonlinear interactions between Alfven 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 Alfven waves in the solar wind, this means that the vector nonlinear coupling dominates in the extended wavenumber range 5 x 10(-4) less than or similar to rho(i)k(0 perpendicular to) less than or similar to 1, where the decay is essentially 3D and nonlocal, generating product Alfven and slow waves around the ion gyroscale. Here.i is the ion gyroradius, and k(0 perpendicular to) is the pump Alfven wavenumber. It appears that, except for the smallest wavenumbers at and below rho(i)k(0 perpendicular to) similar to 10(-4) in Channel I, the nonlinear decay of magnetohydrodynamic Alfven waves propagating from the Sun is nonlocal and cannot generate counter-propagating Alfven waves with similar scales needed for the turbulent cascade. Evaluation of the nonlinear frequency shift shows that product Alfven waves can still be approximately described as normal Alfvenic 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.

Keywordinstabilities magnetohydrodynamics (MHD) plasmas solar wind waves
DOI10.3847/1538-4357/aab555
WOS KeywordFAST SOLAR-WIND ; PARAMETRIC DECAY ; FINITE-AMPLITUDE ; HYDROMAGNETIC-WAVES ; TURBULENCE ; INSTABILITY ; PHOTOSPHERE ; EVOLUTION ; ACCELERATION ; FLUCTUATIONS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000429836900007
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22470
Collection中国科学院紫金山天文台
Corresponding AuthorZhao, J. S.
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Planetary Sci, Nanjing 210008, Jiangsu, Peoples R China
2.Natl Astron Observ, CAS Key Lab Solar Act, Beijing 100012, Peoples R China
3.Belgian Inst Space Aeron, Space Phys Div, Solar Terr Ctr Excellence, Ave Circulaire 3, B-1180 Brussels, Belgium
Recommended Citation
GB/T 7714
Zhao, J. S.,Voitenko, Y.,De Keyser, J.,et al. Nonlinear Decay of Alfven Waves Driven by Interplaying Two- and Three-dimensional Nonlinear Interactions[J]. ASTROPHYSICAL JOURNAL,2018,857(1):12.
APA Zhao, J. S.,Voitenko, Y.,De Keyser, J.,&Wu, D. J..(2018).Nonlinear Decay of Alfven Waves Driven by Interplaying Two- and Three-dimensional Nonlinear Interactions.ASTROPHYSICAL JOURNAL,857(1),12.
MLA Zhao, J. S.,et al."Nonlinear Decay of Alfven Waves Driven by Interplaying Two- and Three-dimensional Nonlinear Interactions".ASTROPHYSICAL JOURNAL 857.1(2018):12.
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