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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, Lei; He, Jiansen; Zhao, Jinsong; Yao, Shuo; Feng, Xueshang; He, JS (reprint author), Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China.
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2018
Volume864Issue:1Pages:35
ISSN0004-637X
Language英语
KeywordSolar Wind Turbulence Waves
AbstractMagnetic 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.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/6431
Collection空间科学部
Corresponding AuthorHe, JS (reprint author), Peking Univ, Sch Earth & Space Sci, Beijing 100871, 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):35.
APA Zhang, Lei,He, Jiansen,Zhao, Jinsong,Yao, Shuo,Feng, Xueshang,&He, JS .(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),35.
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):35.
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