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OBSERVATIONAL EVIDENCE FOR THE RELATIONSHIP BETWEEN WALEN SLOPE AND AMPLITUDE RATIO OF INWARD TO OUTWARD ALFVEN WAVES IN THE SOLAR WIND
Yang, L.; Lee, L. C.; Chao, J. K.; Hsieh, W. C.; Luo, Q. Y.; Li, J. P.; Shi, J. K.; Wu, D. J.; Yang, L (reprint author), Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China.; Yang, L (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China.; Lee, LC (reprint author), Natl Cent Univ, Inst Space Sci, Jhongli 320, Taiwan.; Lee, LC (reprint author), Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan.
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2016
Volume817Issue:2Pages:178
ISSN0004-637X
Language英语
KeywordMagnetohydrodynamics (Mhd) Methods: Analytical Plasmas Solar Wind Waves
AbstractAssuming 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.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5294
Collection空间科学部
Corresponding AuthorYang, L (reprint author), Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China.; Yang, L (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China.; Lee, LC (reprint author), Natl Cent Univ, Inst Space Sci, Jhongli 320, Taiwan.; Lee, LC (reprint author), Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan.
Recommended Citation
GB/T 7714
Yang, L.,Lee, L. C.,Chao, J. K.,et al. OBSERVATIONAL EVIDENCE FOR THE RELATIONSHIP BETWEEN WALEN SLOPE AND AMPLITUDE RATIO OF INWARD TO OUTWARD ALFVEN WAVES IN THE SOLAR WIND[J]. ASTROPHYSICAL JOURNAL,2016,817(2):178.
APA Yang, L..,Lee, L. C..,Chao, J. K..,Hsieh, W. C..,Luo, Q. Y..,...&Lee, LC .(2016).OBSERVATIONAL EVIDENCE FOR THE RELATIONSHIP BETWEEN WALEN SLOPE AND AMPLITUDE RATIO OF INWARD TO OUTWARD ALFVEN WAVES IN THE SOLAR WIND.ASTROPHYSICAL JOURNAL,817(2),178.
MLA Yang, L.,et al."OBSERVATIONAL EVIDENCE FOR THE RELATIONSHIP BETWEEN WALEN SLOPE AND AMPLITUDE RATIO OF INWARD TO OUTWARD ALFVEN WAVES IN THE SOLAR WIND".ASTROPHYSICAL JOURNAL 817.2(2016):178.
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