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Nature of Magnetic Holes above Ion Scales: A Mixture of Stable Slow Magnetosonic and Unstable Mirror Modes in a Double-polytropic Scenario?
Zhang, Lei1,2; He, Jiansen2; Zhao, Jinsong3; Yao, Shuo4; Feng, Xueshang1
2018-09-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume864Issue:1Pages:8
Abstract

Magnetic holes are common features with a prominent dip of magnetic field strength in space plasma turbulence. As to their nature, there exists a dispute of explanations among discontinuities, magnetic reconnection, solitons, kinetic-scale electron vortexes, slow waves, and mirror-mode instability. As magnetic holes are often accompanied by thermal anisotropy, at magnetohydrodynamic scales double-polytropic equations can serve as an appropriate description. The reason for the long-lasting dispute lies in the fact that both mirror-mode structures and oblique slow-mode waves are characterized with anticorrelation between plasma density (or temperature) and magnetic field strength, which, as often used in preceding works, is also the characteristic feature of magnetic holes. Therefore, to finally and unambiguously diagnose the nature of magnetic holes above ion scales, we propose to resort to other features, among which nu(parallel to) and its phase relation with vertical bar B vertical bar and n behave differently between mirrormode structures and slow-mode waves. Herewith we establish a model with superposition of both slow and mirror modes to reproduce the observed types of behaviors (n, nu(parallel to), vertical bar B vertical bar, T-parallel to, T-perpendicular to). This model inspires new understanding of the nature of magnetic holes: the magnetic hole in reality is not solely contributed by only one mode, but a mixture of the two modes with an adjustable amplitude ratio.

Keywordsolar wind turbulence waves
DOI10.3847/1538-4357/aad4aa
WOS KeywordSOLAR-WIND ; PLASMA SHEET ; WAVES ; TURBULENCE ; MAGNETOSHEATH ; HELIOSHEATH ; DECREASES ; ORIGIN ; FIELD
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000443165600008
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21938
Collection中国科学院紫金山天文台
Corresponding AuthorHe, Jiansen
Affiliation1.Chinese Acad Sci, SIGMA Space Weather Grp, Natl Space Sci Ctr, Beijing 100190, Peoples R China
2.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
4.China Univ Geosci Beijing, Sch Geophys & Informat Technol, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Lei,He, Jiansen,Zhao, Jinsong,et al. Nature of Magnetic Holes above Ion Scales: A Mixture of Stable Slow Magnetosonic and Unstable Mirror Modes in a Double-polytropic Scenario?[J]. ASTROPHYSICAL JOURNAL,2018,864(1):8.
APA Zhang, Lei,He, Jiansen,Zhao, Jinsong,Yao, Shuo,&Feng, Xueshang.(2018).Nature of Magnetic Holes above Ion Scales: A Mixture of Stable Slow Magnetosonic and Unstable Mirror Modes in a Double-polytropic Scenario?.ASTROPHYSICAL JOURNAL,864(1),8.
MLA Zhang, Lei,et al."Nature of Magnetic Holes above Ion Scales: A Mixture of Stable Slow Magnetosonic and Unstable Mirror Modes in a Double-polytropic Scenario?".ASTROPHYSICAL JOURNAL 864.1(2018):8.
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