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 p...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.展开更多
文摘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.
