Radio wavefront of very inclined extensive air-showers: A simulation study for extended and sparse radio arrays

Radio-detection is becoming an established technique for the detection of air showers induced by cosmic particles. This in particular true at highest energies, where very large areas are required. A proper description shape radio wavefront emitted may allow to reconstruct properties its parent particle. In this article, we show that with zenith angles larger than 60{\deg} --those targeted giant arrays detecting extensive particles--, a point-source-like allows constraint lateral position shower axis within few meters. Following, reconstructed longitudinal point source correlated nature rays initiating shower. Further systematic studies pending determine robustness parameter and validity as proxy ray composition studies.