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Large-Amplitude Electromagnetic Ion Cyclotron Waves and Density Fluctuations in the Flank of the Earth's Magnetosheath
Zhao, J. S.1; Wang, T. Y.2; Dunlop, M. W.2,3; Shi, C.1,4; He, J. S.5; Dong, X. C.3; Wu, D. J.1; Giles, B.6; Russell, C. T.7
2019-05-16
Source PublicationGEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
Volume46Issue:9Pages:4545-4553
Corresponding AuthorZhao, J. S.(js_zhao@pmo.ac.cn)
AbstractThe electromagnetic ion cyclotron (EMIC) wave usually observed in the Earth's magnetosheath is thought to be generated through the ion temperature anisotropy instability. This paper presents an observation of a long-lasting large-amplitude EMIC wave event in the dawnside flank of the magnetosheath by the Magnetospheric Multiscale mission, lasting from 06:33:00 to 12:35:00 UT on 16 April 2018. The wave amplitude is around 0.2 nT as compared to the ambient magnetic field similar to 12 nT. The characteristic frequency and scale size are around 0.2 Hz and 1,028 km, respectively. Accompanying EMIC waves are density fluctuations, which exhibit both positive and negative correlations with the longitudinal magnetic field. Using the fitted parameters for the ion and electron phase space densities, plasma kinetic theory predicts local excitations of both EMIC and mirror instabilities, which provide the energy of these observed EMIC waves and density fluctuations. Plain Language Summary The Earth's Magnetosheath is a region slowing down high-speed particles originating from the solar wind, protecting the Earth from the hazards of high-energy charged particles. A considerable fraction of the energy of energetic particles is transferred into plasma waves. This paper presents an observational event of large-amplitude low-frequency electromagnetic waves lasting nearly 6 hr, propagating from the outer magnetosheath to the inner magnetosheath. Density fluctuations are found to coexist with these electromagnetic waves. Applying the measurements of charged particles to modeling, we show the observed waves are likely excited by free energy provided by ions with an anisotropic temperature distribution, consistent with wave theory.
DOI10.1029/2019GL081964
WOS KeywordLOW-FREQUENCY WAVES ; MAGNETIC-FIELD FLUCTUATIONS ; MIRROR WAVES ; PLASMA ; DEPLETION ; DOWNSTREAM ; INSTABILITIES ; TRANSFORM ; SPECTRA ; SHOCK
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000468869500001
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/26675
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, Jiangsu, Peoples R China
2.STFC, RAL Space, Didcot, Oxon, England
3.Beihang Univ, Sch Space & Environm, Beijing, Peoples R China
4.Nanjing Univ Aeronaut & Astronaut, Coll Astronaut, Nanjing, Jiangsu, Peoples R China
5.Peking Univ, Sch Earth & Space Sci, Beijing, Peoples R China
6.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA
7.Univ Calif Los Angeles, Dept Earth Planetary & Sp Sci, Los Angeles, CA USA
Recommended Citation
GB/T 7714
Zhao, J. S.,Wang, T. Y.,Dunlop, M. W.,et al. Large-Amplitude Electromagnetic Ion Cyclotron Waves and Density Fluctuations in the Flank of the Earth's Magnetosheath[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(9):4545-4553.
APA Zhao, J. S..,Wang, T. Y..,Dunlop, M. W..,Shi, C..,He, J. S..,...&Russell, C. T..(2019).Large-Amplitude Electromagnetic Ion Cyclotron Waves and Density Fluctuations in the Flank of the Earth's Magnetosheath.GEOPHYSICAL RESEARCH LETTERS,46(9),4545-4553.
MLA Zhao, J. S.,et al."Large-Amplitude Electromagnetic Ion Cyclotron Waves and Density Fluctuations in the Flank of the Earth's Magnetosheath".GEOPHYSICAL RESEARCH LETTERS 46.9(2019):4545-4553.
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