SCALAR AND VECTOR NONLINEAR DECAYS OF LOW-FREQUENCY ALFVEN WAVES
文献类型：期刊论文
| 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 |
| 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 |
| 学科主题 | 天文和天体物理 |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:000348820900109 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/14840]  |
| 专题 | 紫金山天文台_太阳和太阳系等离子体研究团组 |
| 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 |
| 推荐引用方式 GB/T 7714 | Zhao, J. S.,Voitenko, Y.,De Keyser, J.,et al. SCALAR AND VECTOR NONLINEAR DECAYS OF LOW-FREQUENCY ALFVEN WAVES[J]. ASTROPHYSICAL JOURNAL,2015,799(2):222. |
| APA | Zhao, J. S.,Voitenko, Y.,De Keyser, J.,&Wu, D. J..(2015).SCALAR AND VECTOR NONLINEAR DECAYS OF LOW-FREQUENCY ALFVEN WAVES.ASTROPHYSICAL JOURNAL,799(2),222. |
| MLA | Zhao, J. S.,et al."SCALAR AND VECTOR NONLINEAR DECAYS OF LOW-FREQUENCY ALFVEN WAVES".ASTROPHYSICAL JOURNAL 799.2(2015):222. |
入库方式： OAI收割
来源：紫金山天文台
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