Speaker
Description
The dynamical evolution of the outer belts should be a delicate balance among several processes. In order to discriminate what physical processes are dominant for the large flux enhancement of the outer belt electrons, we have developed the data assimilation code on the outer belt electrons. In our data assimilation, the particle filter and the particle smoother are used for the assimilation, which are effective for the non-linear/non-Gauss distribution problem. We include the radial diffusion coefficient and the internal source model as the state vector and estimate the dynamical variations of these parameters. The results indicate that only the radial diffusion process is not always enough to explain the observed flux enhancement and the internal source process should be necessary. The assimilation result suggests that the internal source process tend to take place around the storm recovery phase, which is consistent with the observations.
