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First Experimental Characterization of Microwave Emission from Cosmic Ray Air Showers

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arxiv 1410.8291 v1 pith:CPMTAWEE submitted 2014-10-30 astro-ph.IM astro-ph.HE

First Experimental Characterization of 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 S. Mathys H.J. Mayer 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 microwaveemissionshowersabovebeenenergiesfirstfrequency
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We report the first direct measurement of the overall characteristics 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 in the GHz frequency range. Microwave signals have been detected for more than 30 showers with energies above 3*10^16 eV. The observations presented in this Letter are consistent with a mainly forward-directed and polarised emission process in the GHz frequency range. The measurements show that microwave radiation offers a new means of studying air showers at energies above 10^17 eV.

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