Time-dependent Acceleration of Solar Wind Particles at Interplanetary Traveling Shocks

A time‐dependent focused transport model is used to model how solar wind protons are injected from the suprathermal tail of the solar wind distribution into diffusive shock acceleration at both a strong and a weak coronal mass ejection‐driven shock. It is discussed how the temporal evolution of the injection and acceleration process can result in solar energetic particle spectra that differ substantially from the prediction of standard steady state diffusive shock acceleration models.