摘要
The effects of electron pressure gradient term in the generalized Ohm’ law is studied by 3 D MHD simulation code under condition of high plasma Beta and small ion inertial length. The results show that the electron pressure gradient term increases the velocity of electrons and ions, and therefore increases the field aligned current, finally leading to the increase of core magnetic field. Since the field aligned current is the principal way by which the magnetosphere is coupled with the ionosphere, the electron pressure gradient term enhances the coupling of magnetosphere ionosphere. The electron pressure gradient can also generate the dynamic Alfven wave. It is supposed that this Alfven wave may change the velocity of particles.
The effects of electron pressure gradient term in the generalized Ohm' law is studied by 3 D MHD simulation code under condition of high plasma Beta and small ion inertial length. The results show that the electron pressure gradient term increases the velocity of electrons and ions, and therefore increases the field aligned current, finally leading to the increase of core magnetic field. Since the field aligned current is the principal way by which the magnetosphere is coupled with the ionosphere, the electron pressure gradient term enhances the coupling of magnetosphere ionosphere. The electron pressure gradient can also generate the dynamic Alfven wave. It is supposed that this Alfven wave may change the velocity of particles.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第5期597-604,共8页
Chinese Journal of Geophysics
基金
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关键词
地球磁层
磁场重联
电子压力梯度
场向电流
粒子加速
Magnetic reconnection, Electron pressure gradient, Field aligned current, Particle acceleration.
