Understanding the ARA02 cosmic ray candidate event

Ultra High Energy Cosmic Rays (UHE-CRs) are among the most interesting multi-messenger candidates, comprising single particles of enormous energies from distant sources. Since the radio emission from UHE-CRs has many similarities to that of ultra high energy neutrinos (UHE$\nu$), the signals arising from UHE-CR may be observed through measurements made by in-ice radio neutrino detectors. The Askaryan Radio Array (ARA) is one such experiment currently searching for (UHE$\nu$s), complementary to UHE-CRs. ARA has deployed five `stations', including one phased array. In each station, antennas have been lowered to a depth of around 200m in the South Polar ice. There have been events recorded in ARA station2 (A2) that could be of UHE-CR origin; comprehensive simulations are helpful in better determining the source of such events. The simulation package consists of the recently developed FAERIE (the Framework for the Simulation of Air shower Emission of Radio for in-Ice Experiments) code, which has integrated three different software components: CoREAS, CORSIKA-7.5, and GEANT4. The former two are responsible for the propagation of air showers and modeling of radio emissions in the air, while GEANT4 is used to model the in-ice development of the particle shower and also the radio emission produced. Both CoREAS and GEANT4 use end-point formalism to calculate the electric fields at the antenna locations. The detector responses are added using the ARA detector simulation package AraSim. We discuss preliminary results on the origins of one candidate UHE-CR event.