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

被引：52

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.

引用

页数：8

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