Pitch angle evolutions of oxygen ions driven by storm time ULF poloidal standing waves
文献类型：期刊论文
| 作者 | Yang, B.; Zong, Q. -G.; Fu, S. Y.; Takahashi, K.; Li, X.; Wang, Y. F.; Pu, Z. Y.; Fu, H. S.; Reme, H.; Yue, C. |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 出版日期 | 2011 |
| 卷号 | 116页码:A03207 |
| ISSN号 | 0148-0227 |
| 通讯作者 | Yang, B (reprint author), Peking Univ, Inst Space Phys & Appl Technol, Beijing 100871, Peoples R China. |
| 中文摘要 | We present the first systematic observational study on the pitch angle evolutions of O(+) ions associated with ULF Pc5 poloidal standing waves excited during geomagnetic storms. The O(+) ion measurements are made on board the CLUSTER satellites with the Composition Distribution Function (CODIF) instrument, which covers energies from 1 to 40 keV, a low-energy portion of the ring current. We find that the nature of the ion flux oscillation strongly depends on the magnetic latitude of observation. Near the magnetic equator, the flux oscillation appears only around 0 degrees and 180 degrees pitch angles with no phase delay, which can result from wave-particle interactions in a fundamental mode standing wave with a strong poloidal component. Away from the equator, however, the flux oscillation appears in a wide range of pitch angles with strong pitch angle dispersion that reverses sign from the Southern Hemisphere to the Northern Hemisphere. The latitude dependence of the dispersion signature is explained by combining the ion energy modulation near the equator and the time of flight effect of ion bounce motion. The analysis technique shown in this study can be used to diagnose the field line mode structure of ULF waves. |
| 英文摘要 | We present the first systematic observational study on the pitch angle evolutions of O(+) ions associated with ULF Pc5 poloidal standing waves excited during geomagnetic storms. The O(+) ion measurements are made on board the CLUSTER satellites with the Composition Distribution Function (CODIF) instrument, which covers energies from 1 to 40 keV, a low-energy portion of the ring current. We find that the nature of the ion flux oscillation strongly depends on the magnetic latitude of observation. Near the magnetic equator, the flux oscillation appears only around 0 degrees and 180 degrees pitch angles with no phase delay, which can result from wave-particle interactions in a fundamental mode standing wave with a strong poloidal component. Away from the equator, however, the flux oscillation appears in a wide range of pitch angles with strong pitch angle dispersion that reverses sign from the Southern Hemisphere to the Northern Hemisphere. The latitude dependence of the dispersion signature is explained by combining the ion energy modulation near the equator and the time of flight effect of ion bounce motion. The analysis technique shown in this study can be used to diagnose the field line mode structure of ULF waves. |
| 学科主题 | 空间物理 |
| 资助信息 | NSFC [40831061, 41074117]; Special Fund for Research in the Public Interest [201005017-3]; NASA [NNX10AK93G] |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2014-12-15 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/3105]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Yang, B.,Zong, Q. -G.,Fu, S. Y.,et al. Pitch angle evolutions of oxygen ions driven by storm time ULF poloidal standing waves[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2011,116:A03207. |
| APA | Yang, B..,Zong, Q. -G..,Fu, S. Y..,Takahashi, K..,Li, X..,...&Sheng, C..(2011).Pitch angle evolutions of oxygen ions driven by storm time ULF poloidal standing waves.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,116,A03207. |
| MLA | Yang, B.,et al."Pitch angle evolutions of oxygen ions driven by storm time ULF poloidal standing waves".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 116(2011):A03207. |
入库方式： OAI收割
来源：国家空间科学中心
浏览0
下载0
收藏0
其他版本
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。