Radio Detection of Cosmic Rays With Lopes

Horneffer, A.; Apel, W. D.; Badea, F.; Bähren, L.; Bekk, K.; Bercuci, A.; Bertaina, M.; Biermann, Peter L.; Blümer, J.; Bozdog, H.; Brancus, I. M.; Brüggemann, M.; Buchholz, P.; Buitink, S.; Butcher, H. R.; Чиавасса, А.; Daumiller, K.; Bruyn, A. G. de; Vos, C. M. de; Pierro, F. Di; Döll, P.; Engel, R.; Falcke, H.; Gemmeke, H.; Ghia, P. L.; Glasstetter, R.; Grupen, C.; Haungs, A.; Heck, D.; Hörandel, J. R.; Huege, T.; Kampert, K.‐H.; Kant, G. W.; Klein, U.; Kolotaev, Y.; Koopman, Y.; Krömer, O.; Kuijpers, J.; Lafèbre, S.; Maier, G.; Mayer, H.J.; Milke, J.; Mitrica, B.; Morello, C.; Navarra, G.; Nehls, S.; Nigl, A.; Obenland, R.; Oehlschläger, J.; Ostapchenko, S.; Over, S.; Pepping, H. J.; Petrović, J.; Pierog, T.; Plewnia, S.; Rebel, H.; Risse, A.; Roth, M.; Schieler, H.; Schoonderbeek, G.; Sima, O.; Stümpert, M.; Toma, G.; Trinchero, G.; Ulrich, H.; Buren, J. van; Capellen, W. van; Walkowiak, W.; Weindl, A.; Wijnholds, Stefan J.; Wochele, J.; Zabierowski, J.; Zensus, J. A.; Zimmermann, D.

doi:10.1142/s0217751x0603357x

Cited by 16 publications

(15 citation statements)

References 5 publications

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“…On basis of a known mono-frequent reference source with constant phase relation these disturbances are corrected. For the data sample used in this analysis, a TV-transmitter visible in the measured frequency range is used for the phase calibration [3].…”

Section: Data Calibrationmentioning

confidence: 99%

“…The first step of the beam forming procedure [3] is the application of geometrical shifts of the data by the time difference of the pulse coming from the given direction to reach the position of the corresponding antenna. These shifts take into account the curvature of the electro-magnetic shower front (as free parameter to be fitted) and are done by multiplying a phase gradient in the frequency domain before transforming the data back to the time domain.…”

Section: Pulse Height Calculationsmentioning

confidence: 99%

“…Due to technical restrictions in past times, the radio emission accompanying cosmic ray air showers was a somewhat neglected feature in the past. However, the study of this EAS component has experienced a revival by recent activities, in particular by the LOPES project [2,3]. LOPES as pathfinder for large scale radio detection for the LOFAR project [4] and the Pierre Auger Observatory [5] investigates the correlations of radio data with shower parameters reconstructed by the extensive air shower experiment KASCADE-Grande [6].…”

Section: Introductionmentioning

confidence: 99%

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Lateral distribution of the radio signal in extensive air showers measured with LOPES

Apel¹,

Arteaga

Asch

et al. 2010

Astroparticle Physics

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a b s t r a c tThe antenna array LOPES is set up at the location of the KASCADE-Grande extensive air shower experiment in Karlsruhe, Germany and aims to measure and investigate radio pulses from extensive air showers. The coincident measurements allow us to reconstruct the electric field strength at observation level in dependence of general EAS parameters. In the present work, the lateral distribution of the radio signal in air showers is studied in detail. It is found that the lateral distributions of the electric field strengths in individual EAS can be described by an exponential function. For about 20% of the events a flattening towards the shower axis is observed, preferentially for showers with large inclination angle. The estimated scale parameters R 0 , describing the slope of the lateral profiles range between 100 and 200 m. No evidence for a direct correlation of R 0 with shower parameters like azimuth angle, geomagnetic angle, or primary energy can be found. This indicates that the lateral profile is an intrinsic property of the radio emission during the shower development which makes the radio detection technique suitable for large scale applications.

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Section: Data Calibrationmentioning

confidence: 99%

Section: Pulse Height Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lateral distribution of the radio signal in extensive air showers measured with LOPES

Apel¹,

Arteaga

Asch

et al. 2010

Astroparticle Physics

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“…At this point, the reconstructed shower direction from KASCADE-Grande is used as a starting value. For details of the experimental setup of the LOPES radio antennas see references [8,15,16].…”

Section: The Lopes Antenna Arraymentioning

confidence: 99%

“…Within this framework of the geosynchrotron effect, values for the electric field strength at ground level were predicted, first with analytical [6], and later with full Monte Carlo calculations [7]. By these simulations it was proposed that the field strength emitted by air showers with primary energies above 10 17 eV should be detectable by an antenna array like the LOPES experiment [8].…”

Section: Introductionmentioning

confidence: 99%

Amplitude calibration of a digital radio antenna array for measuring cosmic ray air showers

Nehls¹,

Hakenjos

Arts

et al. 2008

Nuclear Instruments and Methods in Physics Research Section A:

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Radio pulses are emitted during the development of air showers, where air showers are generated by ultra-high energy cosmic rays entering the Earth's atmosphere. These nanosecond short pulses are presently investigated by various experiments for the purpose of using them as a new detection technique for cosmic particles. For an array of 30 digital radio antennas (LOPES experiment) an absolute amplitude calibration of the radio antennas including the full electronic chain of the data acquisition system is performed, in order to estimate absolute values of the electric field strength for these short radio pulses. This is mandatory, because the measured radio signals in the MHz frequency range have to be compared with theoretical estimates and with predictions from Monte Carlo simulations to reconstruct features of the primary cosmic particle. A commercial reference radio emitter is used to estimate frequency dependent correction factors for each single antenna of the radio antenna array. The expected received power is related to the power recorded by the full electronic chain. Systematic uncertainties due to different environmental conditions and the described calibration procedure are of order 20 %.

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Progress in air shower radio measurements: Detection of distant events

Lopes

Bähren

Buitink

et al. 2006

Astroparticle Physics

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Data taken during half a year of operation of 10 LOPES antennas (LOPES-10), triggered by EAS observed with KASCADE-Grande have been analysed. We report about the analysis of correlations of radio signals measured by LOPES-10 with extensive air shower events reconstructed by KASCADE-Grande, including shower cores at large distances. The efficiency of detecting radio signals induced by air showers up to distances of 700 m from the shower axis has been investigated. The results are discussed with special emphasis on the effects of the reconstruction accuracy for shower core and arrival direction on the coherence of the measured radio signal. In addition, the correlations of the radio pulse amplitude with the primary cosmic ray energy and with the lateral distance from the shower core are studied.

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Radio Detection of Cosmic Rays With Lopes

Cited by 16 publications

References 5 publications

Lateral distribution of the radio signal in extensive air showers measured with LOPES

Lateral distribution of the radio signal in extensive air showers measured with LOPES

Amplitude calibration of a digital radio antenna array for measuring cosmic ray air showers

Progress in air shower radio measurements: Detection of distant events

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