Probing the radio emission from air showers with polarization measurements

0432736 - FZÚ 2015 RIV US eng J - Článek v odborném periodiku
Aab, A. - Abreu, P. - Aglietta, M. - Boháčová, Martina - Chudoba, Jiří - Ebr, Jan - Mandát, Dušan - Nečesal, Petr - Nožka, Libor - Palatka, Miroslav - Pech, Miroslav - Prouza, Michael - Řídký, Jan - Schovánek, Petr - Trávníček, Petr - Vícha, Jakub … celkem 496 autorů
Probing the radio emission from air showers with polarization measurements.
Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 89, č. 5 (2014), "052002-1"-"052002-18". ISSN 1550-7998
Grant CEP: GA MŠMT(CZ) LG13007; GA TA ČR TA01010517; GA MŠMT(CZ) 7AMB12AR013
Institucionální podpora: RVO:68378271
Klíčová slova: Pierre Auger Observatory * detector * cosmic rays
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 4.643, rok: 2014

The emission of radio waves from air showers has been attributed to the so-called geomagnetic emission process. At frequencies around 50 MHz this process leads to coherent radiation which can be observed with rather simple setups. The direction of the electric field induced by this emission process depends only on the local magnetic field vector and on the incoming direction of the air shower. We report on measurements of the electric field vector where, in addition to this geomagnetic component, another component has been observed that cannot be described by the geomagnetic emission process. The data provide strong evidence that the other electric field component is polarized radially with respect to the shower axis, in agreement with predictions made by Askaryan who described radio emission from particle showers due to a negative charge excess in the front of the shower.
Trvalý link: http://hdl.handle.net/11104/0237111