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We present a microscopic computation of the radio emission from air showersinitiated by ultra-high energy cosmic rays in the atmosphere. The strategyadopted is to compute each secondary particle contribution of theelectromagnetic component and to construct the total signal at any location.SELFAS2 is a code which doesn't rely on air shower generators like AIRES orCORSIKA and it is based on the concept of air shower universality which makesit completely autonomous. Each positron and electron of the air shower isgenerated randomly following relevant distributions and tracking them alongtheir travel in the atmosphere. We confirm in this paper earlier results thatthe radio emission is mainly due to the time derivative of the transversecurrent and the time derivative of the charge excess. The time derivative ofthe transverse current created by systematic deviations of charges in thegeomagnetic field is usually dominant compared to the charge excesscontribution except for the case of an air shower parallel to the geomagneticfield.

Simulation of radio emission from cosmic ray air shower with SELFAS2