Electromagnetic Waves around the Proton Cyclotron Frequency in the Sheath Regions of Interplanetary Magnetic Clouds: STEREO Observations
文献类型：期刊论文
| 作者 | Li, Q. H.1,2; Yang, L.1,3 ; Wu, D. J.1; Wang, T. Y.4
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2019-03-20 |
| 卷号 | 874期号:1页码:13 |
| ISSN号 | 0004-637X |
| 关键词 | instabilities magnetic fields Sun: coronal mass ejections (CMEs) solar wind waves |
| DOI | 10.3847/1538-4357/ab06f7 |
| 通讯作者 | Yang, L.(ylei@pmo.ac.cn) |
| 英文摘要 | The compressed and turbulent sheath regions of interplanetary magnetic clouds (IMCs) provide a natural laboratory to study electromagnetic waves (EMWs) around the proton cyclotron frequency f(cp). Based on the Morlet wavelet spectral analysis, the repeated filtering analysis and the minimum variance analysis of high-resolution magnetic field data from the STEREO spacecraft, 81 EMW events are identified in the sheath regions of six IMCs. These EMWs are all transverse, almost circularly polarized, and quasi-parallel propagating along the background magnetic field B-0. They can be left-handed (LH) or right-handed (RH) polarized in the spacecraft frame, where the occurrence rate of the LH-polarized EMWs is higher than that of RH-polarized ones, consistent with previous observations in the solar wind. Also, a comparative analysis of polarization sense of these EMWs has been made in the spacecraft and plasma frames. Our results show that more than half of EMW events suffer a polarization reversal from the spacecraft to plasma frames, which are deduced to propagate inward relative to the solar wind flow. Others are outward-propagating waves. In the plasma frame, the outward-propagating LH-EMWs and inward-propagating RH-EMWs have relatively higher occurrence rates than the inward-propagating LH-EMWs and outward-propagating RH-EMWs, respectively. Furthermore, in the plasma frame all the frequencies of LH-EMWs are below f(cp), but the RH-EMW frequencies can exceed f(cp). These results are helpful in understanding the physical properties of EMWs and their roles in the sheath regions of IMCs. |
| WOS关键词 | FAST MAGNETOSONIC SHOCKS ; EMIC WAVES ; ANISOTROPY INSTABILITIES ; MIRROR WAVES ; LOSS-CONE ; ION ; DOWNSTREAM ; PARALLEL ; GENERATION ; FIELD |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000462047700013 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/24187]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Yang, L. |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Key Lab Planetary Sci, Nanjing 210034, Jiangsu, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China 3.Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing 100190, Peoples R China 4.Rutherford Appleton Lab, RAL Space, Didcot OX11 0QX, Oxon, England |
| 推荐引用方式 GB/T 7714 | Li, Q. H.,Yang, L.,Wu, D. J.,et al. Electromagnetic Waves around the Proton Cyclotron Frequency in the Sheath Regions of Interplanetary Magnetic Clouds: STEREO Observations[J]. ASTROPHYSICAL JOURNAL,2019,874(1):13. |
| APA | Li, Q. H.,Yang, L.,Wu, D. J.,&Wang, T. Y..(2019).Electromagnetic Waves around the Proton Cyclotron Frequency in the Sheath Regions of Interplanetary Magnetic Clouds: STEREO Observations.ASTROPHYSICAL JOURNAL,874(1),13. |
| MLA | Li, Q. H.,et al."Electromagnetic Waves around the Proton Cyclotron Frequency in the Sheath Regions of Interplanetary Magnetic Clouds: STEREO Observations".ASTROPHYSICAL JOURNAL 874.1(2019):13. |
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来源：紫金山天文台
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