In situ observations of EMIC waves in O+ band by the Van Allen Probe A

被引：58

作者：

Yu, Xiongdong ^{[1
]}

Yuan, Zhigang ^{[1
]}

Wang, Dedong ^{[1
]}

Li, Haimeng ^{[1
]}

Huang, Shiyong ^{[1
]}

Wang, Zhenzhen ^{[1
]}

Zheng, Qiao ^{[1
]}

Zhou, Mingxia ^{[1
]}

Kletzing, C. A. ^{[2
]}

Wygant, J. R. ^{[3
]}

机构：

[1] Wuhan Univ, Sch Elect Informat, Wuhan 430072, Peoples R China

[2] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[3] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2015年 / 42卷 / 05期

基金：

高等学校博士学科点专项科研基金; 中国国家自然科学基金;

关键词：

EMIC waves; oxygen band; O plus ion torus; Van Allen Probes; ION-CYCLOTRON WAVES; PLASMAPAUSE; INSTABILITY; GENERATION; AKEBONO; FIELD;

D O I：

10.1002/2015GL063250

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Through polarization and spectra analysis of the magnetic field observed by the Van Allen Probe A, we present two typical cases of O+ band electromagnetic ion cyclotron (EMIC) waves in the outer plasmasphere or plasma trough. Although such O+ band EMIC waves are rarely observed, 18 different events of O+ band EMIC waves (16 events in the outer plasmasphere and two events in the plasma trough) are found from September 2012 to August 2014 with observations of the Van Allen Probe A. We find that the preferred region for the occurrence of O+ band EMIC waves is in L=2-5 and magnetic local time = 03-13, 19-20, which is in accordance with the occurrence region of O+ ion torus. Therefore, our result suggests that the O+ ion torus in the outer plasmasphere during geomagnetic activities should play an important role in the generation of EMIC waves in O+ band.

引用

页码：1312 / 1317

页数：6

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