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Spatial Distribution of Electromagnetic Waves near the Proton Cyclotron Frequency in ICME Sheath Regions Associated with Quasi-perpendicular Shocks: Wind Observations
Alternative TitleWOS:000523448200001
Li, Q. H.; Yang, L.; Xiang, L.; Wu, D. J.
Source PublicationASTROPHYSICAL JOURNAL
2020
Volume892Issue:2Pages:98
DOI10.3847/1538-4357/ab7cde
ISSN0004-637X
Language英语
KeywordInterplanetary magnetic fields Solar coronal mass ejection shocks Solar wind Space plasmas CORONAL MASS EJECTIONS SOLAR-WIND MAGNETIC-FIELD MAGNETOSPHERIC STORMS MIRROR WAVES DOWNSTREAM DRIVEN PLASMA ANISOTROPY PARALLEL
AbstractElectromagnetic waves (EMWs) near the proton cyclotron frequency f(cp) are transverse left-handed (LH) or right-handed (RH) polarized waves, and are ubiquitous in the solar wind. However, the characteristics of these waves in the sheath regions of interplanetary coronal mass ejections (ICMEs) are poorly understood. Through a comprehensive survey of Wind magnetic field and plasma data using dynamic spectra and repeated filtering analyses, 700 EMW events (7.1% of the analysis time) are identified in the 62 ICME sheath regions associated with quasi-perpendicular shocks involved with a low shock Mach number M-f and low upstream beta(1). In the ICME sheath regions, outward (inward)-propagating LH (RH) EMWs have relatively higher counts and longer duration than inward (outward)-propagating LH (RH) EMWs in the plasma frame, consistent with previous STEREO observations. The spatial distributions of the magnetic field, plasma, and frequency parameters of EMWs are also presented in both spacecraft and plasma frames, especially the proton (alpha) temperature anisotropy alpha abundance N-alpha/N-p, and normalized differential alpha-proton speed V-d/V-A. After removing the Doppler shift, 81.1% (59%) of all outward (inward)-propagating LH EMWs have a frequency below (above) 0.5f(cp), while 68.3% (64%) of all outward (inward)-propagating RH EMWs have a frequency smaller (greater) than 0.5f(cp). Further investigations of local plasma parameters reveal that different excitation mechanisms for EMWs are in different subregions of the ICME sheath regions. These results are helpful in understanding the important role of EMWs in the solar wind-ICME coupling process with different sheath regions.
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7623
Collection中国科学院国家空间科学中心
Affiliation1.[Li, Q. H.
2.Yang, L.
3.Wu, D. J.] Chinese Acad Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210034, Peoples R China
4.[Li, Q. H.] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China
5.[Yang, L.] Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China
6.[Xiang, L.] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Peoples R China
Recommended Citation
GB/T 7714
Li, Q. H.,Yang, L.,Xiang, L.,et al. Spatial Distribution of Electromagnetic Waves near the Proton Cyclotron Frequency in ICME Sheath Regions Associated with Quasi-perpendicular Shocks: Wind Observations[J]. ASTROPHYSICAL JOURNAL,2020,892(2):98.
APA Li, Q. H.,Yang, L.,Xiang, L.,&Wu, D. J..(2020).Spatial Distribution of Electromagnetic Waves near the Proton Cyclotron Frequency in ICME Sheath Regions Associated with Quasi-perpendicular Shocks: Wind Observations.ASTROPHYSICAL JOURNAL,892(2),98.
MLA Li, Q. H.,et al."Spatial Distribution of Electromagnetic Waves near the Proton Cyclotron Frequency in ICME Sheath Regions Associated with Quasi-perpendicular Shocks: Wind Observations".ASTROPHYSICAL JOURNAL 892.2(2020):98.
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