Analysis of inclined showers measured with LOPES

Saftoiu, A.; Apel, W. D.; Arteaga, J. C.; Asch, T.; Auffenberg, J.; Badea, F.; Bahren, L.; Bekk, K.; Bertaina, Mario Edoardo; Biermann, P. L.; Blumer, J.; Bozdog, H.; Brancus, I. M.; Bruggemann, M.; Buchholz, P.; Buitink, S.; Cantoni, Elena Carla; Chiavassa, Andrea; Cossavella, F.; Daumiller, K.; Souza, V. d.; DI PIERRO, Federico; Doll, P.; Engel, R.; Falcke, H.; Finger, M.; Fuhrmann, D.; Gemmeke, H.; Ghia, P. L.; Glasstetter, R.; Grupen, C.; Haungs, A.; Heck, D.; Horandel, J. R.; Horneffer, A.; Huege, T.; Isar, P. G.; Kampert, K. H.; Kang, D.; Kickelbick, D.; Kolotaev, Y.; Kromer, O.; Kuijpers, J.; Lafebre, S.; Luczak, P.; Mathes, H. J.; Mayer, H. J.; Milke, J.; Mitrica, B.; Morello, C.; Navarra, Gianni Maria; Nehls, S.; Nigl, A.; Oehlschlager, J.; Over, S.; Petcu, M.; Pierog, T.; Rautenberg, J.; Rebel, H.; Roth, M.; Schieler, H.; Schmidt, A.; Schroder, F.; Sima, O.; Singh, K.; Stumpert, M.; Toma, G.; Trinchero, G. C.; Ulrich, H.; Walkowiak, W.; Weindl, A.; Wochele, J.; Wommer, M.; Zabierowski, J.; Zensus, J. A.

doi:10.1016/j.nima.2009.03.175

In the present study, we analyze the radio signal from inclined air showers recorded by LOPES-30 in coincidence with KASCADE-Grande. LOPES-30 consists of 30 East-West oriented digital antennas, which are amplitude calibrated by an external source. Radio emission from air showers is considered a geomagnetic effect. Inclined events provide a larger range of values for geomagnetic angle (angle between shower axis and geomagnetic field direction) than vertical showers and thus more information on the emission processes can be gathered. In order to have the geometry of the air shower we use the reconstruction provided by the KASCADE-Grande particle detectors array. Analyzing events observed by both LOPES and the extended part of the KASCADE array, Grande, gives the possibility to test in particular the capability and efficiency of radio detection of more distant events. The results are compared with a previous analysis of inclined events recorded by the initial 10 antenna set-up, LOPES-10, in coincidence with the Grande array. (C) 2009 Elsevier B.V. All rights reserved.