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Modulation of Ion and Electron Pitch Angle in the Presence of Large-amplitude, Low-frequency, Left-hand Circularly Polarized Electromagnetic Waves Observed by MMS
Zhao, J. S.1,2; Wang, T. Y.2; Dunlop, M. W.2,3; He, J. S.4; Dong, X. C.3; Wu, D. J.1; Khotyaintsev, Yu. V.5; Ergun, R. E.6; Russell, C. T.7; Giles, B. L.8; Torbert, R. B.9; Burch, J. L.10
2018-11-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume867Issue:1Pages:6
Abstract

Most studies on low-frequency electromagnetic cyclotron waves have assumed a small wave amplitude, which ensures the reasonable application of linear and quasi-linear theories. However, the topic of large-amplitude electromagnetic cyclotron waves has not received much attention. Using Magnetospheric Multiscale measurements, this study observes low-frequency, left-hand circularly polarized electromagnetic waves with magnetic fluctuation similar to 1-2 nT in the dusk flank side of the Earth's magnetosheath. Considering the ambient magnetic field similar to 15 nT therein, the relative wave amplitude is of the order of 0.1. These large magnetic field fluctuations result in a periodic variation of the ion pitch angle. The electron pitch angle exhibits a localized distribution feature with a timescale approximating the wave period. Moreover, some electrons are trapped at a pitch angle similar to 90 degrees, and the trapping is more remarkable as strong waves arise. These two features of the electron pitch angle distribution imply that the trapping of electrons (partly) results from large-amplitude electromagnetic cyclotron fluctuations. Our results illustrate the important role of large-amplitude electromagnetic cyclotron waves on the dynamics of charged particles.

Keywordinstabilities plasmas waves
DOI10.3847/1538-4357/aae097
WOS KeywordCYCLOTRON WAVES ; MAGNETOSPHERIC MULTISCALE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000448890000011
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21063
Collection中国科学院紫金山天文台
Corresponding AuthorZhao, J. S.
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Planetary Sci, Nanjing 210008, Jiangsu, Peoples R China
2.STFC, RAL Space, Didcot OX11 0QX, Oxon, England
3.Beihang Univ, Sch Space & Environm, Beijing 100191, Peoples R China
4.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
5.Swedish Inst Space Phys, SE-75121 Uppsala, Sweden
6.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA
7.Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA
8.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
9.Univ New Hampshire, Durham, NH 03824 USA
10.Southwest Res Inst, San Antonio, TX 78238 USA
Recommended Citation
GB/T 7714
Zhao, J. S.,Wang, T. Y.,Dunlop, M. W.,et al. Modulation of Ion and Electron Pitch Angle in the Presence of Large-amplitude, Low-frequency, Left-hand Circularly Polarized Electromagnetic Waves Observed by MMS[J]. ASTROPHYSICAL JOURNAL,2018,867(1):6.
APA Zhao, J. S..,Wang, T. Y..,Dunlop, M. W..,He, J. S..,Dong, X. C..,...&Burch, J. L..(2018).Modulation of Ion and Electron Pitch Angle in the Presence of Large-amplitude, Low-frequency, Left-hand Circularly Polarized Electromagnetic Waves Observed by MMS.ASTROPHYSICAL JOURNAL,867(1),6.
MLA Zhao, J. S.,et al."Modulation of Ion and Electron Pitch Angle in the Presence of Large-amplitude, Low-frequency, Left-hand Circularly Polarized Electromagnetic Waves Observed by MMS".ASTROPHYSICAL JOURNAL 867.1(2018):6.
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