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
Bursty Bulk Flows(BBF) events are an important phenomenon of plasma transport in the Earth’s magneto tail during substorms, and can be explained by the bubbles model. Although the theories and observations have provi...Bursty Bulk Flows(BBF) events are an important phenomenon of plasma transport in the Earth’s magneto tail during substorms, and can be explained by the bubbles model. Although the theories and observations have provided some estimates of the important parameters of BBFs, such as the cross tail size, these parameters are still an extent instead of accurate value. Based on the latest Tsyganenko magnetospheric model, we provide the cross tail size of BBFs in the magnetic equatorial plane through the north south aligned auroral structures and tracer program. The results show that the predications of the bubbles model agree with the observed facts.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.
文摘Bursty Bulk Flows(BBF) events are an important phenomenon of plasma transport in the Earth’s magneto tail during substorms, and can be explained by the bubbles model. Although the theories and observations have provided some estimates of the important parameters of BBFs, such as the cross tail size, these parameters are still an extent instead of accurate value. Based on the latest Tsyganenko magnetospheric model, we provide the cross tail size of BBFs in the magnetic equatorial plane through the north south aligned auroral structures and tracer program. The results show that the predications of the bubbles model agree with the observed facts.
基金the NNSF of China(41774151,41631071,41527804)Key Research Program of Frontier Sciences CAS(QYZDJ-SSW-DQC010)+3 种基金USTC Research Funds of the Double First-Class Initiativethe Fundamental Research Funds for the Central UniversitiesYoung Elite Scientists Sponsorship Program by CAST(2018QNRC001)the Strategic Priority Research Program of Chinese Academy of Sciences(XDB41000000).
