A Three-Dimensional Ray Tracing Study on Whistler-Mode Chorus During Geomagnetic Activities

被引:3
作者
Zhou Qinghua [1 ,2 ,3 ]
Shi Jiankui [2 ]
Xiao Fuliang [1 ]
机构
[1] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China
[2] Chinese Acad Sci, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China
[3] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
3-D ray tracing study; whistler-mode chorus; geomagnetic activities; ELECTRON ACCELERATION; RESONANT DIFFUSION; RADIATION BELT; CORE PLASMA; WAVES; EMISSIONS; DENSITY;
D O I
10.1088/1009-0630/13/4/11
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
A three-dimensional ray tracing study of a whistler-mode chorus is conducted for different geomagnetic activities by using a global core plasma density model. For the upper-band chorus, the initial azimuthal wave angle affects slightly the projection of ray trajectories onto the plane (Z, root(x(2) + y(2))), but controls the longitudinal propagation. The trajectory of the upper-band chorus is strongly associated with the plasmapause and the magnetic local time (MLT) of chorus source region. For the high geomagnetic activity, the chorus trajectory moves inward together with the plasmapause. In the bulge region, the plasmapause extends outward, while the chorus trajectory moves outward together with the plasmapause. For moderately or high geomagnetic activity, the lower-band chorus suffers low hybrid resonance (LHR) reflection before it reaches the plasmapause, leading to a weak correlation with the geomagnetic activity and magnetic local time of the chorus source region. For low geomagnetic activity, the lower-band chorus may be reflected firstly at the plasmapause instead of suffering LHR reflection, exhibiting a propagation characteristic similar to that of the upper-band chorus. The results provide a new insight into the propagation characteristics of the chorus for different geomagnetic activities and contribute to further understanding of the acceleration of energetic electron by a chorus wave.
引用
收藏
页码:440 / 445
页数:6
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