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Galactic cosmic rays (GCRs) (10GeV~100TeV) are observed on Earth, and their intensity has an energy dependent anisotropy of the order of 0.01~0.1%. According to the Parker model, this anisotropy may a...rise from their interaction (diffusion and convection) with the heliosphere. However, this model is not able to explain the characteristics of individual particle trajectories. In order to understand the invasion process of GCRs in the level of particle trajectory, we performed three-dimensional relativistic test particle simulations in the heliosphere reproduced by the MHD simulation assuming time stationarity. In this paper, we discuss trajectories of the GCRs (protons) with energies of ~10GeV and ~1TeV. Our results indicate that characteristics of particle trajectories change depending on the relative scales between particle gyroradii and heliospheric magnetic structures.続きを見る
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