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题名: OBSERVATIONAL EVIDENCE FOR THE RELATIONSHIP BETWEEN WALEN SLOPE AND AMPLITUDE RATIO OF INWARD TO OUTWARD ALFVEN WAVES IN THE SOLAR WIND
作者: Yang Lei(杨磊)1, 2; Lee, L. C.3, 4; Chao, J. K.3; Hsieh, W. C.3; Luo, Q. Y.1, 5; Li, J. P.1; Shi, J. K.2; Wu, D. J.1
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016-02-01
卷号: 817, 期号:2
关键词: magnetohydrodynamics (MHD) ; methods: analytical ; plasmas ; solar wind ; waves
DOI: 10.3847/0004-637X/817/2/178
文章类型: Article
英文摘要: Assuming that the observed Alfven waves in the solar wind are the superposition of inward-and outward-propagating Alfven waves, we obtain an analytical relation from which the observed Walen slope R-W can give a theoretical estimate of the amplitude ratio R-vA of inward to outward waves. From the Wind data at 1 AU, we select 37 Alfven wave events classified observationally as three kinds: dominant outward Alfven waves with vertical bar R-W vertical bar >= 0.75 (Class A), dominant outward Alfven waves with vertical bar R-W vertical bar < 0.75 (Class B), and dominant inward Alfven waves with vertical bar R-W vertical bar < 0.75 (Class C). For Class A events the theoretical predictions of R-vA based on R-W deviate from the wave amplitude observations, but for Class B and C events the theoretical predictions agree well with related observations, being a direct observational evidence that the superposition of inward and outward Alfven waves can cause the subunity of R-W. A simple simulation is made with a white Gaussian noise to demonstrate that a small noise could reproduce the observed properties of all three kinds of events cause the measured parameters of waves with vertical bar R-W vertical bar >= 0.75 in Class A to deviate significantly from the true values more than waves with vertical bar R-W vertical bar < 0.75. The simulation implies that the observational results based on wave amplitudes seem. reliable only for waves with vertical bar R-W vertical bar < 0.75. The R-vA ratios calculated from the analytical relation based on R-W are closer to true values than those obtained from wave amplitude observations.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: MAGNETIC-FIELD FLUCTUATIONS ; LOW-FREQUENCY TURBULENCE ; ROTATIONAL DISCONTINUITIES ; TANGENTIAL DISCONTINUITIES ; INTERPLANETARY MEDIUM ; INNER HELIOSPHERE ; RADIAL EVOLUTION ; CROSS HELICITY ; POLAR WIND ; TRANSPORT
收录类别: SCI
项目资助者: MSTC(2011CB811402) ; NSFC(41531071 ; NSC of Taiwan(MOST 104-2111-M-001-003-MY2) ; Specialized Research Fund for State Key Laboratories ; 11173061 ; 11373070)
语种: 英语
WOS记录号: WOS:000369437900095
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16133
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, Peoples R China
2.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China
3.Natl Cent Univ, Inst Space Sci, Jhongli 320, Taiwan
4.Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan
5.Chinese Acad Sci, Purple Mt Observ, Key Lab Planetary Sci, Nanjing 210008, Peoples R China
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