Nonstorm time scattering of ring current protons by electromagnetic ion cyclotron waves

被引：48
|
作者：
Xiao, Fuliang [1 ,2 ]
Yang, Chang [1 ]
Zhou, Qinghua [1 ]
He, Zhaoguo [1 ]
He, Yihua [1 ]
Zhou, Xiaoping [1 ]
Tang, Lijun [1 ]
机构：
[1] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China
[2] Chinese Acad Sci, State Key Lab Space Weather, Beijing, Peoples R China
来源：
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2012年 / 117卷
基金：
中国国家自然科学基金;
关键词：
RADIATION BELT ELECTRONS; QUASI-LINEAR DIFFUSION; PITCH-ANGLE SCATTERING; LOSS-CONE DISTRIBUTION; MAGNETIC STORM; GEOMAGNETIC STORMS; SOLAR-WIND; GEOSYNCHRONOUS ORBIT; ENERGETIC PARTICLES; STOCHASTIC ACCELERATION;
D O I：
10.1029/2012JA017922
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report correlated observation of enhanced electromagnetic ion cyclotron (EMIC) waves and dynamic evolution of ring current proton flux collected by Cluster satellite near the location L = 4.5 during March 26-27, 2003, a nonstorm period (D-st > -10). Energetic (5-30 keV) proton fluxes are found to drop rapidly (e.g., a half hour) at lower pitch angles, corresponding to intensified EMIC wave activities. By adopting a Gaussian fit to the observed spectra of EMIC waves, we present two-dimensional (2D) numerical simulations which demonstrate that EMIC wave can yield such decrements in proton flux within 30 minutes, consistent with the observational data. The current result provides a further understanding of ring current dynamics driven by wave-particle interaction under different geomagnetic activities.
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收藏
页数：8
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