Electromagnetic waves downstream of quasi-perpendicular shocks
文献类型：期刊论文
| 作者 | Lu, Q. M. ; Wang, S. |
| 刊名 | Journal of Geophysical Research-Space Physics
 |
| 出版日期 | 2006 |
| 卷号 | 111期号:A5页码:A05204 |
| 关键词 | plasma depletion layer ion-cyclotron waves earths bow shock anisotropy instabilities distributions downstream temperature anisotropies subsolar magnetosheath excitation downstream evolution downstream mirror waves |
| ISSN号 | 0148-0227 |
| 通讯作者 | 北京8701信箱 |
| 英文摘要 | When the incident solar wind H+ and other minor ions cross a shock, they are decelerated differentially by the electrostatic potential at the shock. Therefore ring beam distributions of the minor ions are formed downstream of a quasi-perpendicular shock in the downstream frame. Moreover, the H+ distribution downstream of the quasi-perpendicular shock usually has large perpendicular temperature anisotropy. The He2+ ring beam distribution and H+ temperature anisotropy can excite helium cyclotron waves and proton cyclotron waves, respectively. In this paper, we perform one-dimensional hybrid simulations to investigate the competition between the helium cyclotron waves and proton cyclotron waves, and their influences on the evolution of He2+ and O6+ velocity distributions are also considered. When the wave spectrum is dominated by the helium cyclotron waves, He2+ and O6+ approximately move on the surface of a sphere, which results in shell-like distributions for He2+ and O6+. With the increase of the H+ temperature anisotropy T-perpendicular to p/ T-parallel to p, the amplitude of the proton cyclotron waves also increases. When it is sufficiently large and comparable with that of the helium cyclotron waves, the motions of He2+ and O6+ are irregular, which results in bi-Maxwellian distributions of He2+ and O6+. We also investigate the influence of the plasma beta parallel to(p) on the excited ion cyclotron waves and the evolution of the He2+ and O6+ distributions. The simultaneous observations for He2+ and O6+ in the downstream of shocks with Active Magnetospheric Particle Tracer Explorers (AMPTE)/CCE spacecraft have demonstrated their shell-like distributions. The observed results verify the existence of the helium cyclotron waves downstream of supercritical quasi-perpendicular shocks. |
| 学科主题 | 空间物理 |
| 收录类别 | SCI |
| 原文出处 | http://www.agu.org/pubs/crossref/2006/2005JA011319.shtml |
| 语种 | 英语 |
| 源URL | [http://ir.cssar.ac.cn/handle/122/1046]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Lu, Q. M.,Wang, S.. Electromagnetic waves downstream of quasi-perpendicular shocks[J]. Journal of Geophysical Research-Space Physics,2006,111(A5):A05204. |
| APA | Lu, Q. M.,&Wang, S..(2006).Electromagnetic waves downstream of quasi-perpendicular shocks.Journal of Geophysical Research-Space Physics,111(A5),A05204. |
| MLA | Lu, Q. M.,et al."Electromagnetic waves downstream of quasi-perpendicular shocks".Journal of Geophysical Research-Space Physics 111.A5(2006):A05204. |
入库方式： OAI收割
来源：国家空间科学中心
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