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Observation of Polarised Microwave Emission from Cosmic Ray Air Showers

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arxiv 1306.6738 v1 pith:HH5JPE4P submitted 2013-06-28 astro-ph.IM astro-ph.HE

Observation of Polarised Microwave Emission from Cosmic Ray Air Showers

R. Smida , F. Werner , R. Engel , J.C. Arteaga-Velazquez , K. Bekk , M. Bertaina , J. Bluemer , H. Bozdog
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I.M. Brancus A. Chiavassa F. Cossavella F. Di Pierro P. Doll B. Fuchs D. Fuhrmann C. Grupen A. Haungs D. Heck J.R. Hoerandel D. Huber T. Huege K.-H. Kampert D. Kang H. Klages M. Kleifges O. Kroemer K. Link P. Luczak M. Ludwig H.J. Mathes H.J. Mayer S. Mathys M. Melissas C. Morello P. Neunteufel J. Oehlschlaeger N. Palmieri J. Pekala T. Pierog J. Rautenberg H. Rebel M. Riegel M. Roth F. Salamida H. Schieler S. Schoo F.G. Schroeder O. Sima J. Stasielak G. Toma G.C. Trinchero M. Unger M. Weber A. Weindl H. Wilczynski M. Will J. Wochele J. Zabierowski
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keywords emissionmicrowaveshowersbeenobservationpolarisedradiationradio
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We report on the first direct measurement of the basic features of microwave radio emission from extensive air showers. Using a trigger provided by the KASCADE-Grande air shower array, the signals of the microwave antennas of the CROME (Cosmic-Ray Observation via Microwave Emission) experiment have been read out and searched for signatures of radio emission by high-energy air showers. Microwave signals have been detected for more than 30 showers with energies above $3\times10^{16}$\,eV. The observations presented in this Letter are consistent with a mainly forward-beamed, coherent and polarised emission process in the GHz frequency range. An isotropic, unpolarised radiation is disfavoured as the dominant emission model. The measurements show that microwave radiation offers a new means of studying air showers at very high energy.

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