Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL080826 |
Rippled Electron-Scale Structure of a Dipolarization Front | |
Pan, Dong-Xiao1,2; Khotyaintsev, Yuri V.2; Graham, Daniel B.2; Vaivads, Andris2; Zhou, Xu-Zhi1; Andre, Mats2; Lindqvist, Per-Arne3; Ergun, Robert E.4; Le Contel, Olivier5; Russell, Christopher T.6; Torbert, Roy B.7; Giles, Barbara8; Burch, James L.9 | |
2018-11-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:22页码:12116-12124 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; Sweden; USA; France |
英文摘要 | We use the Magnetospheric Multiscale mission to investigate electron-scale structures at a dipolarization front. The four spacecraft are separated by electron scales and observe large differences in plasma and field parameters within the dipolarization front, indicating strong deviation from typically assumed plane or slightly curved front surface. We attribute this to ripples generated by the lower hybrid drift instability (LHDI) with wave number of k(rho e)similar or equal to 0.4 and maximum wave potential of similar to 1 kV similar to k(B)T(e). Power law-like spectra of E-perpendicular to with slope of -3 indicates the turbulent cascade of LHDI. LHDI is observed together with bursty high-frequency parallel electric fields, suggesting coupling of LHDI to higher-frequency electrostatic waves. Plain Language Summary Dipolarization fronts (DFs) are narrow boundaries with sharp enhancement of magnetic field, located at the leading part of fast plasma jets observed in Earth's magnetotail. DFs are typically assumed to be smooth boundaries at scales comparable to the ion gyroradius and below. In this study, we use the four Magnetospheric Multiscale spacecraft separated by several electron gyroradii to investigate fine structure of a DF. Surprisingly, we observe significant differences in the fields and plasma measurements between the spacecraft despite their small separation. We attribute these signatures to electron-scale disturbances propagating along the DF surface, and thus the DF surface is not smooth as expected but rather rippled. The ripples develop as a result of a plasma instability driven by the strong inhomogeneities present at the DF. The fact that the ripples have such small scales means that they can effectively interact with plasma electrons. |
英文关键词 | dipolarization fronts LHDI ripples electron-scale structures MMS turbulence |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000453250000003 |
WOS关键词 | ELECTROMAGNETIC ENERGY-CONVERSION ; LOWER-HYBRID WAVES ; ANOMALOUS RESISTIVITY |
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/27607 |
专题 | 气候变化 |
作者单位 | 1.Peking Univ, Sch Earth & Space Sci, Beijing, Peoples R China; 2.Swedish Inst Space Phys, Uppsala, Sweden; 3.KTH Royal Inst Technol, Sch Elect Engn, Space & Plasma Phys, Stockholm, Sweden; 4.Univ Colorado, Atmospher & Space Phys Lab, Campus Box 392, Boulder, CO 80309 USA; 5.Univ Paris Sud, Sorbonne Univ, Lab Phys Plasmas, CNRS,Ecole Polytech,Obs Paris, Paris, France; 6.Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90024 USA; 7.Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA; 8.NASA Goddard Space Flight Ctr, Greenbelt, MD USA; 9.Southwest Res Inst, San Antonio, TX USA |
推荐引用方式 GB/T 7714 | Pan, Dong-Xiao,Khotyaintsev, Yuri V.,Graham, Daniel B.,et al. Rippled Electron-Scale Structure of a Dipolarization Front[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(22):12116-12124. |
APA | Pan, Dong-Xiao.,Khotyaintsev, Yuri V..,Graham, Daniel B..,Vaivads, Andris.,Zhou, Xu-Zhi.,...&Burch, James L..(2018).Rippled Electron-Scale Structure of a Dipolarization Front.GEOPHYSICAL RESEARCH LETTERS,45(22),12116-12124. |
MLA | Pan, Dong-Xiao,et al."Rippled Electron-Scale Structure of a Dipolarization Front".GEOPHYSICAL RESEARCH LETTERS 45.22(2018):12116-12124. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论