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Evolution of the Earth's Magnetosheath Turbulence: A Statistical Study Based on MMS Observations
Alternative TitleWOS:000557447600001
Li, Hui1; Jiang, Wence1; Wang, Chi1; Verscharen, Daniel2,3; Zeng, Chen1; Russell, C. T.; Giles, B.; Burch, J. L.
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2020
Volume898Issue:2Pages:L43
DOI10.3847/2041-8213/aba531
ISSN2041-8205
Language英语
KeywordPlanetary magnetosphere Interplanetary turbulence LOW-FREQUENCY WAVES MAGNETIC-FIELD FLUCTUATIONS SOLAR-WIND TURBULENCE DENSITY-FLUCTUATIONS QUASI-PARALLEL MACH NUMBER MAGNETOPAUSE INSTABILITY SPECTRA MHD
AbstractComposed of shocked solar wind, the Earth's magnetosheath serves as a natural laboratory to study the transition of turbulence from low Alfven Mach number, M-A, to high M-A. The simultaneous observations of magnetic field and plasma moments with unprecedented high temporal resolution provided by NASA's Magnetospheric Multiscale Mission (MMS) enable us to study the magnetosheath turbulence at both magnetohydrodynamics (MHD) and sub-ion scales. Based on 1841 burst-mode segments of MMS-1 from 2015 September to 2019 June, comprehensive patterns of the spatial evolution of magnetosheath turbulence are obtained: (1) from the subsolar region to the flanks, M-A increases from <1 to >5. At MHD scales, the spectral indices of the magnetic-field and velocity spectra present a positive and negative correlation with M-A. However, no obvious correlations between the spectral indices and MA are found at sub-ion scales. ( 2) From the bow shock to the magnetopause, the turbulent sonic Mach number, M-turb, generally decreases from >0.4 to <0.1. All spectra steepen at MHD scales and flatten at sub-ion scales, representing positive/negative correlations with M-turb. The break frequency increases by 0.1 Hz when approaching the magnetopause for the magnetic-field and velocity spectra, while it remains at 0.3 Hz for the density spectra. (3) In spite of minor differences, similar results are found for the quasi-parallel and quasi-perpendicular magnetosheath. In addition, such spatial evolution of magnetosheath turbulence is found to be independent of the upstream solar wind conditions, e.g., the averaged Z-component of the interplanetary magnetic field and solar wind speed.
Indexed BySCI
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7547
Collection中国科学院国家空间科学中心
Affiliation1.Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England
4.Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA
5.Russell, C. T.] Univ Calif Los Angeles, Los Angeles, CA USA
6.Giles, B.] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
7.Burch, J. L.] Southwest Res Inst, San Antonio, TX USA
Recommended Citation
GB/T 7714
Li, Hui,Jiang, Wence,Wang, Chi,et al. Evolution of the Earth's Magnetosheath Turbulence: A Statistical Study Based on MMS Observations[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,898(2):L43.
APA Li, Hui.,Jiang, Wence.,Wang, Chi.,Verscharen, Daniel.,Zeng, Chen.,...&Burch, J. L..(2020).Evolution of the Earth's Magnetosheath Turbulence: A Statistical Study Based on MMS Observations.ASTROPHYSICAL JOURNAL LETTERS,898(2),L43.
MLA Li, Hui,et al."Evolution of the Earth's Magnetosheath Turbulence: A Statistical Study Based on MMS Observations".ASTROPHYSICAL JOURNAL LETTERS 898.2(2020):L43.
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