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Coexistence of Slow-mode and Alfven-mode Waves and Structures in 3D Compressive MHD Turbulence
Yang, Liping1,2,3,4; Zhang, Lei1; He, Jiansen2,3; Tu, Chuanyi2; Li, Shengtai4; Wang, Xin5; Wang, Linghua2
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2018
Volume866Issue:1Pages:41
DOI10.3847/1538-4357/aadadf
ISSN0004-637X
Language英语
Keywordmagnetohydrodynamics (MHD) methods: numerical solar wind turbulence
AbstractThe compressible component of solar wind turbulence displays a slow-mode feature. However, the nature of the slow-mode fluctuations remain open. In this work, based on numerical simulations of the driven compressible magnetohydrodynamic (MHD) turbulence with a uniform mean magnetic field, we use polarization of the MHD modes to decompose turbulent velocity and magnetic fields into Alfven modes, slow modes, and fast modes. The numerical results with different cross-helicity, plasma beta beta, and Alfven Mach number note that fast modes are a marginal component among the three decomposed modes, and the compressible component of the MHD turbulence behaves mainly as the slow modes. Both of the decomposed slow modes and Alfven modes exhibit a Kolmogorov-like power-law spectrum and evident anisotropy, with wavevectors mainly distributing around the directions perpendicular to the uniform mean field. For the first time, it is found that the propagating slow magnetosonic waves as well as the non-propagating slow-mode structures are combined to contribute to the compressible fluctuations, and the propagating Alfven waves as well as the non-propagating Alfven-mode structures coexist for the non-compressible fluctuations. However, there is unlikely a one-to-one match between the identified slow waves and Alfven waves, or between the identified slow-mode structures and Alfven-mode structures. These findings provide a new perspective on our understanding of the compressible and non-compressible fluctuations.
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/6541
Collection空间科学部
Affiliation1.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, SIGMA Weather Grp, Beijing 100190, Peoples R China;
2.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China;
3.HIT Inst Space Sci & Appl Technol, Shenzhen 518055, Peoples R China;
4.Los Alamos Natl Lab, Theoret Div, MS B284, Los Alamos, NM 87545 USA;
5.Beihang Univ, Sch Space & Environm, Beijing 100191, Peoples R China
Recommended Citation
GB/T 7714
Yang, Liping,Zhang, Lei,He, Jiansen,et al. Coexistence of Slow-mode and Alfven-mode Waves and Structures in 3D Compressive MHD Turbulence[J]. ASTROPHYSICAL JOURNAL,2018,866(1):41.
APA Yang, Liping.,Zhang, Lei.,He, Jiansen.,Tu, Chuanyi.,Li, Shengtai.,...&Wang, Linghua.(2018).Coexistence of Slow-mode and Alfven-mode Waves and Structures in 3D Compressive MHD Turbulence.ASTROPHYSICAL JOURNAL,866(1),41.
MLA Yang, Liping,et al."Coexistence of Slow-mode and Alfven-mode Waves and Structures in 3D Compressive MHD Turbulence".ASTROPHYSICAL JOURNAL 866.1(2018):41.
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