ABSTRACT
Fang Shenfshen@spaceweather.ac.cn
Chinese Academy of Sciences
| Title : | Modeling the solar energetic particle transport in the 3D background solar wind |
| Abstract | |
| In modeling the transport process of solar energetic particles (SEPs) in the inner heliosphere, previous simulation works often simplify the solar wind velocity as radial and constant, and treat the magnetic field as Parker spiral. In order to fully understand the effect of solar wind velocity and interplanetary magnetic field on the particles' transport process, a realistic background solar wind and magnetic field is required. In this work, we use the focused transport model to investigate the transport of SEPs in the solar wind velocity and magnetic field, which are generated by the 3D high-resolution MHD model with a six-component grid. We find that in the uncompressed solar wind, the time intensity profiles of energetic particles show similar trend in both the MHD background and the Parker magnetic field assumption. However, the simulated SEP flux displays an enhancement as much as a factor of two in the decay phase when passing through the compression regions. Our results indicate that the magnetic focusing effect is responsible for the intensity enhancement. This suggests that the magnetic focusing effect has an important influence on the transport of SEPs, and a realistic 3D background solar wind should be included in such simulations. | |
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