行星际激波导致内磁层脉冲电场的模拟研究

As an interplanetary shock (IPS) compresses on the Earth's magnetosphere, it will launch impulsive electric fields in the inner magnetosphere, which may further induce prompt acceleration and injection of relativistic electrons. Thus, impulsive electric field could be important to the topic of dynamics in the inner magnetosphere. W e perform a MHD simulation on magnetospheric response to interplanetary shock occurred in 2015 December 19th with the Space Weather Modeling Framework (SWMF), to investigate its characteristics on spatial distribution and temporal evolution. The result shows that ： (1) impulsive electric field is induced mainly westward； (2) its amplitude in dayside is larger than it in nightside； (3) its rising time in dayside is shorter than it in nightside. The three main characteristics in simulation are consistent with the statistical results by Zhang et al. (2018) with Van Allen Probes measurements. These results will be helpful for the understanding the prompt response of high energy radiation belt particles to extreme space weather conditions.