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Time-dependent Occurrence Rate of Electromagnetic Cyclotron Waves in the Solar Wind: Evidence for the Effect of Alpha Particles?
Zhao, G. Q.1,2; Feng, H. Q.1; Wu, D. J.3; Chu, Y. H.4; Huang, J.2
2017-09-20
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume847Issue:1Pages:4
Abstract

Previous studies revealed that electromagnetic cyclotron waves (ECWs) near the proton cyclotron frequency exist widely in the solar wind, and the majority of ECWs are left-handed (LH) polarized waves. Using the magnetic field data from the STEREO mission, this Letter carries out a survey of ECWs over a long period of 7 years and calculates the occurrence rates of ECWs with different polarization senses. Results show that the occurrence rate is nearly a constant for the ECWs with right-handed polarization, but it varies significantly for the ECWs with LH polarization. Further investigation of plasma conditions reveals that the LH ECWs take place preferentially in a plasma characterized by higher temperature, lower density, and larger velocity. Some considerable correlations between the occurrence rate of LH ECWs and the properties of ambient plasmas are discussed. The present research may provide evidence for the effect of alpha particles on the generation of ECWs.

Keywordinterplanetary medium instabilities solar wind waves
DOI10.3847/2041-8213/aa88b3
WOS KeywordPROTON/PROTON INSTABILITIES ; STREAM INTERFACES ; STEREO ; PLASMA ; 0.3-AU ; 1-AU
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000411314100002
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22713
Collection中国科学院紫金山天文台
Corresponding AuthorZhao, G. Q.
Affiliation1.Luoyang Normal Univ, Inst Space Phys, Luoyang, Peoples R China
2.Natl Astron Observ, CAS Key Lab Solar Act, Beijing, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Nanjing, Jiangsu, Peoples R China
4.Natl Cent Univ, Inst Space Sci, Chungli, Taiwan
Recommended Citation
GB/T 7714
Zhao, G. Q.,Feng, H. Q.,Wu, D. J.,et al. Time-dependent Occurrence Rate of Electromagnetic Cyclotron Waves in the Solar Wind: Evidence for the Effect of Alpha Particles?[J]. ASTROPHYSICAL JOURNAL LETTERS,2017,847(1):4.
APA Zhao, G. Q.,Feng, H. Q.,Wu, D. J.,Chu, Y. H.,&Huang, J..(2017).Time-dependent Occurrence Rate of Electromagnetic Cyclotron Waves in the Solar Wind: Evidence for the Effect of Alpha Particles?.ASTROPHYSICAL JOURNAL LETTERS,847(1),4.
MLA Zhao, G. Q.,et al."Time-dependent Occurrence Rate of Electromagnetic Cyclotron Waves in the Solar Wind: Evidence for the Effect of Alpha Particles?".ASTROPHYSICAL JOURNAL LETTERS 847.1(2017):4.
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