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| Plasma-beta Modulated Characteristics of Magnetohydrodynamic Waves around the Heliospheric Current Sheet | |
| Alternative Title | WOS:000520955200001 |
| Li, Hui1; Li, Nianwang2; Wang, Chi2; Yao, Shuo3 | |
| Source Publication | ASTROPHYSICAL JOURNAL LETTERS
 |
| 2020 | |
| Volume | 889Issue:1Pages:L16 |
| DOI | 10.3847/2041-8213/ab698f |
| ISSN | 2041-8205 |
| Language | 英语 |
| Keyword | Solar wind Interplanetary magnetic fields Interplanetary physics Magnetohydrodynamics Alfven waves SOLAR-WIND MAGNETIC-FIELD ALFVENIC PERTURBATIONS CLUSTER OBSERVATIONS FINITE-AMPLITUDE SECTOR STRUCTURE IN-SITU EVOLUTION INSTABILITY TURBULENCE |
| Abstract | The magnetohydrodynamics (MHD) wave modes in the heliospheric current sheet (HCS) and the associated heliospheric plasma sheet (HPS) have not been comprehensively investigated in the literature. Based on a frequency-related identification approach, the properties of MHD waves are investigated during 154 HCS crossings observed by the Wind spacecraft from 1995 to 2013. Statistically, the incidence of MHD waves around HCS/HPS is found to be modulated by the plasma beta within the HPS: (1) beta > 5, both Alfven and slow waves obviously decay within the HPS, with the occurrence rate (OR) decreasing from 60% and 20% in the upstream/downstream to 41% and 14% in the HPS vicinity, respectively; (2) 1 beta <= 5, the OR of Alfven waves (AWs) remains nearly stable. However, more slow waves are generated after the HCS crossing, with OR increasing from 13% in the upstream/downstream to 22%; (3) beta <= 1, the OR of Alfven and slow waves remains at similar to 58% and 20% during the entire crossing, in spite of some irregular fluctuations. The results for the HCS without a clear HPS are similar to the situations of a low beta HPS. The parametric decay instability of AWs is proposed as being responsible for the more slow waves generated in the moderate beta HPS, and some indirect observational clues are also given. |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.nssc.ac.cn/handle/122/7600 |
| Collection | 中国科学院国家空间科学中心 |
| Affiliation | 1.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 4.China Univ Geosci Beijing, Sch Geophys & Informat Technol, Beijing 100083, Peoples R China |
| Recommended Citation GB/T 7714 | Li, Hui,Li, Nianwang,Wang, Chi,et al. Plasma-beta Modulated Characteristics of Magnetohydrodynamic Waves around the Heliospheric Current Sheet[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,889(1):L16. |
| APA | Li, Hui,Li, Nianwang,Wang, Chi,&Yao, Shuo.(2020).Plasma-beta Modulated Characteristics of Magnetohydrodynamic Waves around the Heliospheric Current Sheet.ASTROPHYSICAL JOURNAL LETTERS,889(1),L16. |
| MLA | Li, Hui,et al."Plasma-beta Modulated Characteristics of Magnetohydrodynamic Waves around the Heliospheric Current Sheet".ASTROPHYSICAL JOURNAL LETTERS 889.1(2020):L16. |
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