Poloidal ULF wave observed in the plasmasphere boundary layer

doi:10.1002/jgra.50427

	Poloidal ULF wave observed in the plasmasphere boundary layer
	Liu, W.1,2; Cao, J. B.1,2; Li, X.3; Sarris, T. E.4; Zong, Q. -G.5; Hartinger, M.6; Takahashi, K.7; Zhang, H.8; Shi, Q. Q.9; Angelopoulos, V.10
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2013-07-01
卷号	118 期号:7 页码:4298-4307
关键词	ULF wave drift bounce resonance plasmasphere boundary layer
ISSN号	2169-9380
DOI	10.1002/jgra.50427
文献子类	Article
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.
WOS关键词	STANDING ALFVEN WAVES ; RING CURRENT ; GEOMAGNETIC-PULSATIONS ; PARTICLE-POPULATIONS ; DIPOLE MAGNETOSPHERE ; STATISTICAL-ANALYSIS ; INNER MAGNETOSPHERE ; MOVING PLASMA ; FIELD LINES ; SOLAR-WIND
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000325073600032
资助机构	NSFC(41104109 ; NSFC(41104109 ; NASA(NNX10AQ48G ; NASA(NNX10AQ48G ; Specialized Research Fund for State Key Laboratories(201203FSK05) ; Specialized Research Fund for State Key Laboratories(201203FSK05) ; 973 program of China(2011CB811404) ; 973 program of China(2011CB811404) ; 41274166) ; 41274166) ; NNX10AK93G ; NNX10AK93G ; NAS5-02099) ; NAS5-02099) ; NSFC(41104109 ; NSFC(41104109 ; NASA(NNX10AQ48G ; NASA(NNX10AQ48G ; Specialized Research Fund for State Key Laboratories(201203FSK05) ; Specialized Research Fund for State Key Laboratories(201203FSK05) ; 973 program of China(2011CB811404) ; 973 program of China(2011CB811404) ; 41274166) ; 41274166) ; NNX10AK93G ; NNX10AK93G ; NAS5-02099) ; NAS5-02099) ; NSFC(41104109 ; NSFC(41104109 ; NASA(NNX10AQ48G ; NASA(NNX10AQ48G ; Specialized Research Fund for State Key Laboratories(201203FSK05) ; Specialized Research Fund for State Key Laboratories(201203FSK05) ; 973 program of China(2011CB811404) ; 973 program of China(2011CB811404) ; 41274166) ; 41274166) ; NNX10AK93G ; NNX10AK93G ; NAS5-02099) ; NAS5-02099) ; NSFC(41104109 ; NSFC(41104109 ; NASA(NNX10AQ48G ; NASA(NNX10AQ48G ; Specialized Research Fund for State Key Laboratories(201203FSK05) ; Specialized Research Fund for State Key Laboratories(201203FSK05) ; 973 program of China(2011CB811404) ; 973 program of China(2011CB811404) ; 41274166) ; 41274166) ; NNX10AK93G ; NNX10AK93G ; NAS5-02099) ; NAS5-02099)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/87218]
专题	中国科学院地质与地球物理研究所
通讯作者	Liu, W.
作者单位	1.Beihang Univ, Space Sci Inst, Sch Astronaut, Beijing 100191, Peoples R China 2.Chinese Acad Sci, State Key Lab Space Weather, Beijing, Peoples R China 3.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA 4.Democritus Univ Thrace, Space Res Lab, GR-67100 Xanthi, Greece 5.Peking Univ, Inst Space Phys & Appl Technol, Beijing 100871, Peoples R China 6.Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA 7.Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA 8.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 9.Shandong Univ Weihai, Sch Space Sci & Phys, Weihai, Peoples R China 10.Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA
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):4298-4307.
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),4298-4307.
MLA	Liu, W.,et al."Poloidal ULF wave observed in the plasmasphere boundary layer".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 118.7(2013):4298-4307.