Acceleration and Radiation Model of Solar Energetic Particles in an Evolving Active Region

We present a model for the acceleration and radiation of solar energetic particles (electrons) in an evolving active region. The spatio temporal evolution of the active region is calculated using a Cellular Automaton (CA) model for the energy release process. The acceleration of particles is due to the presence of randomly placed, localized electric fields. We calculate the resulting kinetic energy distributions of the particles by performing a parametric study with respect to the trapping time of the injected distribution. Our results show a power law or a power law with an exponential tail behavior for the resulting kinetic energy distribution, depending on the maximum trapping time of the injected particles in the acceleration volume. Finally we calculate the emitted radiation spectrum from the resulting energy distributions.