A focused transport model of suprathermal particles in the interplanetary medium

The primary source of suprathermal particles is in the solar corona. These particles are generally considered a seed population to be accelerated to solar energetic particles by coronal mass ejection shocks. Their distribution in the corona is vital for us to understand the production of solar energetic particles. During propagation through interplanetary space, the properties of suprathermal particles can change dramatically by various transport mechanisms, such as scattering, adiabatic cooling, and stochastic acceleration. To link observations made in the interplanetary space to particle distribution in the solar corona, we have developed a focused transport to calculate the propagation effect. This paper will present focused transport model calculations to show how particle scattering and acceleration can affect the evolution of the suprathermal particle spectrum and anisotropy in interplanetary space.