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Macroscopic Treatment of Radio Emission from Cosmic Ray Air Showers based on Shower Simulations
Werner K., Scholten O.
Astroparticle Physics 29 (2008) 393-411 - http://hal.in2p3.fr/in2p3-00271010
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
Physique/Physique des Hautes Energies - Phénoménologie
Macroscopic Treatment of Radio Emission from Cosmic Ray Air Showers based on Shower Simulations
Klaus Werner1, O. Scholten
1 :  SUBATECH - Laboratoire SUBATECH Nantes
http://www-subatech.in2p3.fr/
CNRS : UMR6457 – IN2P3 – Université de Nantes – École Nationale Supérieure des Mines - Nantes
4, rue Alfred Kastler - 44070 Nantes Cedex 03
France
We present a macroscopic calculation of coherent electro-magnetic radiation from air showers initiated by ultra-high energy cosmic rays, based on currents obtained from Monte Carlo simulations of air showers in a realistic geo-magnetic field. We can clearly relate the time signal to the time dependence of the currents. We find that the the most important contribution to the pulse is related to the time variation of the currents. For showers forming a sufficiently large angle with the magnetic field, the contribution due to the currents induced by the geo-magnetic field is dominant, but neither the charge excess nor the dipole contribution can be neglected. We find a characteristic bipolar signal. In our calculations, we take into account a realistic index of refraction, whose importance depends on the impact parameter and the inclination. Also very important is the role of the positive ions.

Articles dans des revues avec comité de lecture
2008
Astroparticle Physics (Astropart. Phys.)
Publisher Elsevier
ISSN 0927-6505 
29
393-411

Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0712.2517