Modelling Solar Energetic particle (SEP) Transport Related with Stream Interaction Regions and CME Events

Solar energetic particles (SEPs), which originate from the eruptive activities of the solar corona, are accompanied by a significant amount of high-energy charged particles, can cause damage to spacecraft systems and affect human activities in space.Describing the propagation of SEPs in interplanetary space constitutes an indispensable component in the construction of SEP physical model. In this work, we developed a coupled Physics-based model composed of a data-driven analytical background model and a particle transport model represented by the focused transport equation (FTE). By using the coupled model, we try to simulate the energetic particle propagation in different interplanetary structures, such as the stream interaction region (SIR) and the coronal mass ejection (CME), with specific cases observed by WIND, STEREO A/B and SOHO, and to explore the physical nature behind the spacecraft observations.