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题名: SCALAR AND VECTOR NONLINEAR DECAYS OF LOW-FREQUENCY ALFVEN WAVES
作者: Zhao, J. S.1, 2, 3; Voitenko, Y.4; De Keyser, J.4; Wu, D. J.1
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2015-02-01
卷号: 799, 期号:2, 页码:222
关键词: magnetohydrodynamics (MHD) ; plasmas ; solar wind ; Sun: corona ; waves
学科分类: 天文和天体物理
DOI: 10.1088/0004-637X/799/2/222
文章类型: Article
英文摘要: We found several efficient nonlinear decays for Alfven waves in the solar wind conditions. Depending on the wavelength, the dominant decay is controlled by the nonlinearities proportional to either scalar or vector products of wavevectors. The two-mode decays of the pump MHD Alfven wave into co- and counter-propagating product Alfven and slow waves are controlled by the scalar nonlinearities at long wavelengths rho(2)(i)k(0 perpendicular to)(2) < omega(0)/omega(ci) (k(0 perpendicular to) is wavenumber perpendicular to the background magnetic field, omega(0) is frequency of the pump Alfven wave, rho(i) is ion gyroradius, and omega(ci) is ion-cyclotron frequency). The scalar decays exhibit both local and nonlocal properties and can generate not only MHD-scale but also kinetic-scale Alfven and slow waves, which can strongly accelerate spectral transport. All waves in the scalar decays propagate in the same plane, hence these decays are two-dimensional. At shorter wavelengths, rho(2)(i)k(0 perpendicular to)(2) > omega(0)/omega(ci), three-dimensional vector decays dominate generating out-of-plane product waves. The two-mode decays dominate from MHD up to ion scales rho(i)k(0 perpendicular to) similar or equal to 0.3; at shorter scales the one-mode vector decays become stronger and generate only Alfven product waves. In the solar wind the two-mode decays have high growth rates > 0.1 omega(0) and can explain the origin of slow waves observed at kinetic scales.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: KINETIC ALFVEN ; SOLAR-WIND ; TURBULENCE ; PLASMA ; INSTABILITIES ; GENERATION ; EXCITATION ; CYCLOTRON ; DYNAMICS ; EARTH
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000348820900109
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14840
Appears in Collections:太阳和太阳系等离子体研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
3.Nanjing Univ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
4.Belgian Inst Space Aeron, Space Phys Div, Solar Terr Ctr Excellence, B-1180 Brussels, Belgium
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