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Electromagnetic Waves around the Proton Cyclotron Frequency in the Sheath Regions of Interplanetary Magnetic Clouds: STEREO Observations
Li, Q. H.1,2; Yang, L.1,3; Wu, D. J.1; Wang, T. Y.4
2019-03-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume874Issue:1Pages:13
Corresponding AuthorYang, L.(ylei@pmo.ac.cn)
AbstractThe 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.
Keywordinstabilities magnetic fields Sun: coronal mass ejections (CMEs) solar wind waves
DOI10.3847/1538-4357/ab06f7
WOS KeywordFAST MAGNETOSONIC SHOCKS ; EMIC WAVES ; ANISOTROPY INSTABILITIES ; MIRROR WAVES ; LOSS-CONE ; ION ; DOWNSTREAM ; PARALLEL ; GENERATION ; FIELD
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000462047700013
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/24188
Collection中国科学院紫金山天文台
Corresponding AuthorYang, L.
Affiliation1.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
Recommended Citation
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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