Poloidal ULF wave observed in the plasmasphere boundary layer
文献类型：期刊论文
| 作者 | Liu, W.; Cao, J. B.; Li, X.; Sarris, T. E.; Zong, Q. -G.; Hartinger, M.; Takahashi, K.; Zhang, H.; Shi, Q. Q.; Angelopoulos, V. |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 出版日期 | 2013 |
| 卷号 | 118期号:7页码:81960N |
| 关键词 | ULF wave drift bounce resonance plasmasphere boundary layer |
| ISSN号 | 2169-9380 |
| 通讯作者 | Liu, W (reprint author), Beihang Univ, Space Sci Inst, Sch Astronaut, Xueyuan Rd 37, Beijing 100191, Peoples R China. |
| 英文摘要 | We report on a rare ultra-low-frequency (ULF) wave generation event associated with the formation of a plasmasphere boundary layer (PBL), which was well observed by one of the THEMIS satellites, TH-D, during subsequent outbound passes. On 13 September 2011, TH-D observed a sharp plasmapause at L=3.4. The plasmasphere started to expand and continued to be refilled on 14 September. On 15 September, a PBL was formed with two density gradients at L=4.4 and 6.5, respectively. Within the two density gradients, strong radial magnetic field and azimuthal electric field oscillations were observed, suggesting poloidal ULF waves. Based on the phase delay between magnetic and electric field signals, as well as the comparison between the observed wave frequency and predicted harmonic eigenfrequency, we find that the observed oscillations are second harmonic poloidal waves. Further investigation shows that the observed waves are likely generated by drift-bounce resonance with bump-on-tail plasma distributions at similar to 10keV. We demonstrate that the waves are excited within the PBL where the eigenfrequency is close to the bounce frequency of these hot protons, but not outside the PBL where the eigenfrequency deviates from the bounce frequency. Finally, we suggest that cold plasma density seems to be a controlling factor for ULF wave generation as well, in addition to the bump-on-tail energy source, by altering eigenfrequency of the local field lines. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/5056]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Liu, W.,Cao, J. B.,Li, X.,et al. Poloidal ULF wave observed in the plasmasphere boundary layer[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2013,118(7):81960N. |
| APA | Liu, W..,Cao, J. B..,Li, X..,Sarris, T. E..,Zong, Q. -G..,...&Angelopoulos, V..(2013).Poloidal ULF wave observed in the plasmasphere boundary layer.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,118(7),81960N. |
| MLA | Liu, W.,et al."Poloidal ULF wave observed in the plasmasphere boundary layer".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 118.7(2013):81960N. |
入库方式： OAI收割
来源：国家空间科学中心
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