Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL077835 |
Solitary Waves Across Supercritical Quasi-Perpendicular Shocks | |
Vasko, I. Y.1; Mozer, F. S.1; Krasnoselskikh, V. V.1,2; Artemyev, A. V.3,4; Agapitov, O. V.1; Bale, S. D.1,5; Avanov, L.6; Ergun, R.7; Giles, B.6; Lindqvist, P. -A.8; Russell, C. T.3; Strangeway, R.3; Torbert, R.9 | |
2018-06-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:12页码:5809-5817 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; France; Russia; Sweden |
英文摘要 | We consider intense electrostatic solitary waves (ESW) observed in a supercritical quasi-perpendicular Earth's bow shock crossing by the Magnetospheric Multiscale Mission. The ESW have spatial scales of a few tens of meters (a few Debye lengths) and propagate oblique to a local quasi-static magnetic field with velocities from a few tens to a few hundred kilometers per second in the spacecraft frame. Because the ESW spatial scales are comparable to the separation between voltage-sensitive probes, correction factors are used to compute the ESW electric fields. The ESW have electric fields with amplitudes exceeding 600mV/m (oriented oblique to the local magnetic field) and negative electrostatic potentials with amplitudes of a few tenths of the electron temperature. The negative electrostatic potentials indicate that the ESW are not electron phase space holes, while interpretation in terms of ions phase space holes is also questionable. Whatever is their nature, we show that due to the oblique electric field orientation the ESW are capable of efficient pitch-angle scattering and isotropization of thermal electrons. Due to the negative electrostatic potentials the ESW Fermi reflects a significant fraction of the thermal electrons streaming from upstream (downstream) back to upstream (downstream) region, thereby affecting the shock dynamics. The role of the ESW in electron heating is discussed. Plain Language Summary Processes governing electron thermalization across shock waves are not entirely understood. The high resolution particle and 3-D electric field measurements provided by the Magnetospheric Multiscale Mission make it possible to study the Earth's bow shock that is an excellent laboratory for addressing the electron thermalization across supercritical shock waves. Previous observations showed that electron heating across the bow shock is generally governed by macroscopic cross-shock electrostatic field. On the other hand, the role of the turbulence observed across the bow shock in the electron thermalization has remained unclear. In this letter we consider a particular bow shock crossing by the Magnetospheric Multiscale Mission and focus on the role of the high amplitude electrostatic solitary waves in the electron thermalization process. We accurately estimate the electrostatic solitary wave parameters and show that due to electric fields oriented oblique to a local DC magnetic field and negative electrostatic potentials with amplitudes of a few tenths of the electron temperature, these Debye-scale structures are capable of efficient pitch angle scattering, Fermi reflection, and isotropization of thermal electrons. |
英文关键词 | shock waves electrostatic turbulence electrostatic solitary waves pitch angle scattering isotropization Fermi reflection |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000438499100001 |
WOS关键词 | TRANSITION REGION ; DOUBLE-LAYERS ; ELECTRON |
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/27838 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA; 2.Univ Orleans, LPC2E, Orleans, France; 3.Univ Calif Los Angeles, Inst Geophys & Planetary Sci, Los Angeles, CA 90024 USA; 4.Russian Acad Sci, Space Res Inst, Moscow, Russia; 5.Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA; 6.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA; 7.Univ Colorado, Boulder, CO 80309 USA; 8.Royal Inst Technol, Stockholm, Sweden; 9.Univ New Hampshire, Durham, NH 03824 USA |
推荐引用方式 GB/T 7714 | Vasko, I. Y.,Mozer, F. S.,Krasnoselskikh, V. V.,et al. Solitary Waves Across Supercritical Quasi-Perpendicular Shocks[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(12):5809-5817. |
APA | Vasko, I. Y..,Mozer, F. S..,Krasnoselskikh, V. V..,Artemyev, A. V..,Agapitov, O. V..,...&Torbert, R..(2018).Solitary Waves Across Supercritical Quasi-Perpendicular Shocks.GEOPHYSICAL RESEARCH LETTERS,45(12),5809-5817. |
MLA | Vasko, I. Y.,et al."Solitary Waves Across Supercritical Quasi-Perpendicular Shocks".GEOPHYSICAL RESEARCH LETTERS 45.12(2018):5809-5817. |
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