Radio emission from the air shower sudden death
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We present a new mechanism for air shower radio emission due to the sudden absorption of secondary particles when the shower front hits the ground. The electrons present in excess during the air shower development imply a net residual negative charge in the shower front. We show that for showers hitting the ground before the complete extinction of their electromagnetic component, the sudden vanishing of the net residual negative charge generates an electric field contribution in the kHz---MHz range. We characterize this radio contribution as a function of primary energy, arrival direction and antenna position, using the simulation code SELFAS2. We discuss the interest of this new predicted signal on detection and analysis of ultra-high energy cosmic-rays and we argue that the region in the shower of maximum emission of the electric field should not coincide with the region of maximum development.
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