Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL080757 |
Multispacecraft Analysis of Electron Holes | |
Steinvall, K.1,2; Khotyaintsev, Yu. V.1; Graham, D. B.1; Vaivads, A.1; Lindqvist, P. -A.3; Russell, C. T.4; Burch, J. L.5 | |
2019-01-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:1页码:55-63 |
文章类型 | Article |
语种 | 英语 |
国家 | Sweden; USA |
英文摘要 | Electron holes (EHs) are nonlinear electrostatic structures in plasmas. Most previous in situ studies of EHs have been limited to single- and two-spacecraft methods. We present statistics of EHs observed by Magnetospheric Multiscale on the magnetospheric side of the magnetopause during October 2016 when the spacecraft separation was around 6km. Each EH is observed by all four spacecraft, allowing EH properties to be determined with unprecedented accuracy. We find that the parallel length scale, l(vertical bar), scales with the Debye length. The EHs can be separated into three groups of speed and potential based on their coupling to ions. We present a method for calculating the perpendicular length scale, l. The method can be applied to a small subset of the observed EHs for which we find shapes ranging from almost spherical to more oblate. For the remaining EHs we use statistical arguments to find l/l(vertical bar)approximate to 5, implying dominance of oblate EHs. Plain Language Summary Electron holes are positively charged structures moving along the magnetic field and are frequently observed in space plasmas in relation to strong currents and electron beams. Electron holes interact with the plasma, leading to electron heating and scattering. In order to understand the effect of these electron holes, we need to accurately determine their properties, such as velocity, length scale, and potential. Most earlier studies have relied on single- or two-spacecraft methods to analyze electron holes. In this study we use the four satellites of the Magnetospheric Multiscale mission to analyze 236 electron holes with unprecedented accuracy. We find that the holes can be divided into three distinct groups with different properties. Additionally, we calculate the width of individual electron holes, finding that they are typically much wider than long, resembling pancakes. |
英文关键词 | Electron holes |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000456938600007 |
WOS关键词 | SOLITARY WAVES ; PHASE-SPACE ; DOUBLE-LAYERS ; INSTABILITIES |
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/28937 |
专题 | 气候变化 |
作者单位 | 1.Swedish Inst Space Phys, Uppsala, Sweden; 2.Uppsala Univ, Dept Phys & Astron, Uppsala, Sweden; 3.KTH Royal Inst Technol, Dept Space & Plasma Phys, Stockholm, Sweden; 4.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA; 5.Southwest Res Inst, San Antonio, TX USA |
推荐引用方式 GB/T 7714 | Steinvall, K.,Khotyaintsev, Yu. V.,Graham, D. B.,et al. Multispacecraft Analysis of Electron Holes[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(1):55-63. |
APA | Steinvall, K..,Khotyaintsev, Yu. V..,Graham, D. B..,Vaivads, A..,Lindqvist, P. -A..,...&Burch, J. L..(2019).Multispacecraft Analysis of Electron Holes.GEOPHYSICAL RESEARCH LETTERS,46(1),55-63. |
MLA | Steinvall, K.,et al."Multispacecraft Analysis of Electron Holes".GEOPHYSICAL RESEARCH LETTERS 46.1(2019):55-63. |
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