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DOI | 10.1002/2017GL074168 |
Exact Vlasov-Maxwell equilibria for asymmetric current sheets | |
Allanson, O.1,2; Wilson, F.1; Neukirch, T.1; Liu, Y. -H.3; Hodgson, J. D. B.1 | |
2017-09-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:17 |
文章类型 | Article |
语种 | 英语 |
国家 | Scotland; England; USA |
英文摘要 | The NASA Magnetospheric Multiscale mission has made in situ diffusion region and kinetic-scale resolution measurements of asymmetric magnetic reconnection for the first time, in the Earth's magnetopause. The principal theoretical tool currently used to model collisionless asymmetric reconnection is particle-in-cell simulations. Many particle-in-cell simulations of asymmetric collisionless reconnection start from an asymmetric Harris-type magnetic field but with distribution functions that are not exact equilibrium solutions of the Vlasov equation. We present new and exact equilibrium solutions of the Vlasov-Maxwell system that are self-consistent with one-dimensional asymmetric current sheets, with an asymmetric Harris-type magnetic field profile, plus a constant nonzero guide field. The distribution functions can be represented as a combination of four shifted Maxwellian distribution functions. This equilibrium describes a magnetic field configuration with more freedom than the previously known exact solution and has different bulk flow properties. Plain Language Summary Magnetic reconnection is a fundamental phenomenon in space science and is currently a subject of intense study. During a reconnection event, stored energy that had been bound up in stressed electromagnetic fields is released in the form of heat and the kinetic energy of particles. The NASA MMS mission is currently making measurements of these phenomena in the Earth's Magnetosphere, with unprecedented levels of accuracy and resolution. Our work presents a theoretical model of a structure in space known as an asymmetric current sheet such as the MMS mission encounters during a reconnection event. The model can be implemented into computer simulations, with which to compare to the results from MMS satellite data. This will help us understand the fundamental physics of asymmetric magnetic reconnection. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000411702400002 |
WOS关键词 | MAGNETIC RECONNECTION ; DAYSIDE MAGNETOPAUSE ; SHEAR ; FIELD ; THICKNESS ; EQUATION ; MODELS ; MOTION ; LAYER ; SPEED |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/28073 |
专题 | 气候变化 |
作者单位 | 1.Univ St Andrews, Solar & Magnetospher Theory Grp, Sch Math & Stat, St Andrews, Fife, Scotland; 2.Univ Reading, Space & Atmospher Elect Grp, Dept Meteorol, Reading, Berks, England; 3.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA |
推荐引用方式 GB/T 7714 | Allanson, O.,Wilson, F.,Neukirch, T.,et al. Exact Vlasov-Maxwell equilibria for asymmetric current sheets[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(17). |
APA | Allanson, O.,Wilson, F.,Neukirch, T.,Liu, Y. -H.,&Hodgson, J. D. B..(2017).Exact Vlasov-Maxwell equilibria for asymmetric current sheets.GEOPHYSICAL RESEARCH LETTERS,44(17). |
MLA | Allanson, O.,et al."Exact Vlasov-Maxwell equilibria for asymmetric current sheets".GEOPHYSICAL RESEARCH LETTERS 44.17(2017). |
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