Nonstorm time dropout of radiation belt electron fluxes on 24 September 2013

被引：63
作者：
Su, Zhenpeng [1 ,2 ]
Gao, Zhonglei [1 ,2 ,3 ]
Zhu, Hui [4 ]
Li, Wen [5 ]
Zheng, Huinan [1 ,2 ]
Wang, Yuming [1 ]
Wang, Shui [1 ]
Spence, H. E. [6 ]
Reeves, G. D. [7 ,8 ]
Baker, D. N. [9 ]
Blake, J. B. [10 ]
Funsten, H. O. [11 ]
Wygant, J. R. [12 ]
机构：
[1] Univ Sci & Technol China, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei, Peoples R China
[2] Univ Sci & Technol China, Collaborat Innovat Ctr Astronaut Sci & Technol, Hefei, Peoples R China
[3] Univ Sci & Technol China, Sch Earth & Space Sci, Mengcheng Natl Geophys Observ, Hefei, Peoples R China
[4] Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA
[5] Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA
[6] Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA
[7] Los Alamos Natl Lab, Space Sci & Applicat Grp, Los Alamos, NM USA
[8] New Mexico Consortium, Space Sci Div, Los Alamos, NM USA
[9] Univ Colorado, Atmospher & Space Phys Lab, Campus Box 392, Boulder, CO 80309 USA
[10] Aerosp Corp, POB 92957, Los Angeles, CA 90009 USA
[11] Los Alamos Natl Lab, ISR Div, Los Alamos, NM USA
[12] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA
来源：
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2016年 / 121卷 / 07期
基金：
中国国家自然科学基金;
关键词：
radiation belt dropout; precipitation loss; numerical modeling; wave-particle interaction; plasmaspheric hiss; EMIC; VAN ALLEN PROBES; RELATIVISTIC ELECTRONS; INNER MAGNETOSPHERE; GEOMAGNETIC STORMS; RESONANT SCATTERING; EMIC WAVES; DIFFUSION; ACCELERATION; LOSSES; DYNAMICS;
D O I：
10.1002/2016JA022546
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Radiation belt electron flux dropouts during the main phase of geomagnetic storms have received increasing attention in recent years. Here we focus on a rarely reported nonstorm time dropout event observed by Van Allen Probes on 24 September 2013. Within several hours, the radiation belt electron fluxes exhibited a significant (up to 2 orders of magnitude) depletion over a wide range of radial distances (L > 4.5), energies (approximate to 500keV to several MeV) and equatorial pitch angles (0 degrees(e)180 degrees). STEERB simulations show that the relativistic electron loss in the region L = 4.5-6.0 was primarily caused by the pitch angle scattering of observed plasmaspheric hiss and electromagnetic ion cyclotron waves. Our results emphasize the complexity of radiation belt dynamics and the importance of wave-driven precipitation loss even during nonstorm times.
引用
收藏
页码：6400 / 6416
页数：17
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