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Radial Variations of Outward and Inward Alfvenic Fluctuations Based on Ulysses Observations
Yang, L.; Lee, L. C.; Li, J. P.; Luo, Q. Y.; Kuo, C. L.; Shi, J. K.; Wu, D. J.; Yang, L (reprint author), Chinese Acad Sci, Purple Mt Observ, Key Lab Planetary Sci, Nanjing 210008, Jiangsu, Peoples R China.; Yang, L (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China.
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2017
Volume850Issue:2Pages:177
ISSN0004-637X
Language英语
KeywordMagnetohydrodynamics (Mhd) Methods: Analytical Plasmas Solar Wind Waves
AbstractUlysses magnetic and plasma data are used to study hourly scale Alfvenic fluctuations in the solar polar wind. The calculated energy ratio R-vA(2) (cal) of inward to outward Alfven waves is obtained from the observed Walen slope through an analytical expression, and the observed R-vA(2) (obs) is based on a direct decomposition of original Alfvenic fluctuations into outward-and inward-propagating Alfven waves. The radial variation of R-vA(2) (cal) shows a monotonically increasing trend with heliocentric distance r, implying the increasing local generation or contribution of inward Alfven waves. The contribution is also shown by the radial increase in the occurrence of dominant inward fluctuations. We further pointed out a higher occurrence (similar to 83% of a day in average) of dominant outward Alfvenic fluctuations in the solar wind than previously estimated. Since R-vA(2) (cal) is more accurate than R-vA(2) (obs) in the measurement of the energy ratio for dominant outward fluctuations, the values of R-vA(2) (cal) in our results are likely more realistic in the solar wind than those previously estimated as well as R-vA(2) (obs) in our results. The duration ratio R-T of dominant inward to all Alfvenic fluctuations increases monotonically with r, and is about two or more times that from Voyager 2 observations at r >= 4 au. These results reveal new qualitative and quantitative features of Alfvenic fluctuations therein compared with previous studies and put constraints on modeling the variation of solar wind fluctuations.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/6205
Collection空间科学部
Corresponding AuthorYang, L (reprint author), Chinese Acad Sci, Purple Mt Observ, Key Lab Planetary Sci, Nanjing 210008, Jiangsu, Peoples R China.; Yang, L (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Yang, L.,Lee, L. C.,Li, J. P.,et al. Radial Variations of Outward and Inward Alfvenic Fluctuations Based on Ulysses Observations[J]. ASTROPHYSICAL JOURNAL,2017,850(2):177.
APA Yang, L..,Lee, L. C..,Li, J. P..,Luo, Q. Y..,Kuo, C. L..,...&Yang, L .(2017).Radial Variations of Outward and Inward Alfvenic Fluctuations Based on Ulysses Observations.ASTROPHYSICAL JOURNAL,850(2),177.
MLA Yang, L.,et al."Radial Variations of Outward and Inward Alfvenic Fluctuations Based on Ulysses Observations".ASTROPHYSICAL JOURNAL 850.2(2017):177.
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20178502177.pdf(823KB)期刊论文作者接受稿开放获取CC BY-NC-SAApplication Full Text
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