The effects of Interplanetary Shocks on Energetic Storm Particle Events

Solar Energetic particles (SEPs) travel across the interplanetary medium with energies of the order of MeV. These events can be classified as impulsive or gradual depending on some characteristics of the flux spectra profile. Impulsive events are commonly associated to flares, and gradual SEPs are commonly associated to Interplanetary Coronal Mass Ejection (ICME) driving shocks. The physical process by which these particles are accelerated is not completely understood. A subset of gradual SEP events, known as Energetic Storm Particle (ESP) show flux enhancements near the time of shock crossing. In this work we use STEREO plasma and magnetic field data from 2011-2014 to study ESP characteristics and relate them to the parameters of the associated shock. We also study the properties of the waves observed upstream and downstream of the shocks.