Nature of Magnetic Holes above Ion Scales: A Mixture of Stable Slow Magnetosonic and Unstable Mirror Modes in a Double-polytropic Scenario?
文献类型：期刊论文
| 作者 | 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. |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2018 |
| 卷号 | 864期号:1页码:35 |
| 关键词 | Solar Wind Turbulence Waves |
| ISSN号 | 0004-637X |
| 英文摘要 | 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. |
| 语种 | 英语 |
| 资助机构 | NSFC [41574168, 41231069, 41274172, 41474148, 41421003, 41574166, 41531073, 41731067] ; National Young Talent Program of China ; Youth Innovation Promotion Association CAS |
| 源URL | [http://ir.nssc.ac.cn/handle/122/6431]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 通讯作者 | He, JS (reprint author), Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China. |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：国家空间科学中心
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