Charge excess signature in the CODALEMA data. Interpretation with SELFAS2.

摘要

The systematic shift between the shower core estimation using the particle array data and the shower coreestimation using the radio array data of the CODALEMA experiment is discussed. Using the simulation code SELFAS2we show that the consideration of the charge excess contribution in the total radio emission of air showers generates a shiftof the apparent ground radio core along the east-west axis. This radio core shift is then characterized for the CODALEMAstatistic and compared with the experimental data. The good agreement between data and simulation suggests that thisbehavior can be considered as an experimental signature of the charge excess contribution.