A macroscopic description of coherent geo-magnetic radiation from cosmic-ray air showers

Scholten, Olaf; Werner, K.; Rusydi, Febdian

doi:10.1016/j.astropartphys.2007.11.012

Cited by 169 publications

(214 citation statements)

References 18 publications

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“…The first approach was proposed by Falcke & Gorham [2] and worked out in thorough detail in Huege & Falcke [5,6]. The second approach was first described by Kahn & Lerche [7] and has recently been improved by Scholten et al [8] and Werner & Scholten [9].…”

Section: Introductionmentioning

confidence: 99%

Simulation of radio emission from air showers in atmospheric electric fields

Buitink

Huege

Falcke

et al. 2010

Astroparticle Physics

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We study the effect of atmospheric electric fields on the radio pulse emitted by cosmic ray air showers. Under fair weather conditions the dominant part of the radio emission is driven by the geomagnetic field. When the shower charges are accelerated and deflected in an electric field additional radiation is emitted. We simulate this effect with the Monte Carlo code REAS2, using CORSIKA-simulated showers as input. In both codes a routine has been implemented that treats the effect of the electric field on the shower particles. We find that the radio pulse is significantly altered in background fields of the order of ∼ 100 V/cm and higher. Practically, this means that air showers passing through thunderstorms emit radio pulses that are not a reliable measure for the shower energy. Under other weather circumstances significant electric field effects are expected to occur rarely, but nimbostratus clouds can harbor fields that are large enough. In general, the contribution of the electric field to the radio pulse has polarization properties that are different from the geomagnetic pulse. In order to filter out radio pulses that have been affected by electric field effects, radio air shower experiments should keep weather information and perform full polarization measurements of the radio signal.

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Section: Introductionmentioning

confidence: 99%

Simulation of radio emission from air showers in atmospheric electric fields

Buitink

Huege

Falcke

et al. 2010

Astroparticle Physics

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“…In addition to the microscopic simulation of air showers, macroscopic models (e.g., [11]) have been developed. They have been imperative to gaining an understanding of the dominant emission mechanisms, namely geomagnetically induced time-varying transverse currents and a time-varying negative charge excess (also called Askaryan effect), which superpose with characteristic signal polarizations leading to an asymmetric signal distribution in the shower plane.…”

Section: Understanding Of Radio Emissionmentioning

confidence: 99%

Radio Detection of Cosmic Rays–Achievements and Future Potential

Huege

2018

Proceedings of 2016 International Conference on Ultra-High Energy Cosmic Rays (UHECR2016)

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When modern efforts for radio detection of cosmic rays started about a decade ago, hopes were high but the true potential was unknown. Since then, we have achieved a detailed understanding of the radio emission physics and have consequently succeeded in developing sophisticated detection schemes and analysis approaches. In particular, we have demonstrated that the important air-shower parameters arrival direction, particle energy and depth of shower maximum can be reconstructed reliably from radio measurements, with a precision that is comparable with that of other detection techniques. At the same time, limitations inherent to the radio-emission mechanisms have become apparent. In this article, I shortly review the capabilities of radio detection in the very high-frequency band, and discuss the potential for future application in existing and new experiments for cosmic-ray detection.

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“…The absolute amount of this charge excess changes during the shower development, as the total number of particles changes. Hence, this leads to a radio emission with radial polarization, like it is expected from any changing net charge (see also [33,39]). 5.…”

Section: Variation Of the Dipole Strength Of The Air Shower [40]mentioning

confidence: 99%

“…Summing up the emission of individual mechanisms is an approach followed by the MGMR [39] model. This model agrees in first order with REAS3 calculations [33], which shows that the picture of individual emission mechanisms is a reasonable approximation.…”

Section: Emission Mechanismsmentioning

confidence: 99%

Instruments and Methods for the Radio Detection of High Energy Cosmic Rays

Schröder¹

2012

Springer Theses

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Instruments and Methods for the Radio Detection of High Energy Cosmic RaysCosmic rays at energies above 10 15 eV cannot be measured directly due to the low flux. Instead, the properties of the primary cosmic ray particles (arrival direction, energy, mass) have to be reconstructed from measurements of secondary particles forming an air shower. For this, digital radio antenna arrays, like LOPES at the Karlsruhe Institute of Technology (KIT), are a relatively new instrument. The radio emission mainly originates from the deflection of secondary air shower electrons and positrons in the Earth's magnetic field. The radio technique aims at achieving a similar quality in the reconstruction of air shower parameters as the established Cherenkov or fluorescence light detection methods, which in contrast to the radio technique are limited to dark, moonless nights.The present studies aim to advance the air shower radio detection in technological aspects and analysis methods. The developments are mainly applied to LOPES, but also provide a useful set of tools, which will soon be applied on the analysis of first AERA measurements. AERA is a next generation digital radio array at the Pierre Auger Observatory in Argentina. Moreover, this thesis reflects the recent progress in the understanding of the radio emission by air showers. The main results of the studies are:• A new method for time calibration with a reference beacon has been developed.It allows a time resolution of ∼ 1 ns even with large antenna arrays. This is necessary for digital radio interferometry which improves the signal-to-noise ratio and the reconstruction accuracy of the primary particle properties. This method is essential for the measurement of cosmic rays with LOPES, and is going to be applied at AERA.• A per-event comparison of lateral distributions measured with LOPES and REAS3 simulations reflects a significantly improved understanding of the radio emission mechanisms. For the first time a Monte Carlo simulation of the radio emission by air showers can in average reproduce measured data. A detailed investigation of systematic effects was performed to accurately reconstruct LOPES lateral distributions. In particular, a method has been developed to appropriately treat the influence of radio noise on measured lateral distributions.• It is shown that a conical radio wavefront fits LOPES measurements and REAS3 simulations better than a spherical wavefront, which up to now has been assumed for LOPES beamforming analyses. Furthermore, the atmospheric depth of the shower maximum X max can be reconstructed by determining the opening angle of the conical wavefront. However, due to the small lateral extension of LOPES of about 200 m and the high radio background at KIT, the measurement uncertainty (∆X max ≈ 200 g/cm 2 ) is too large for a per-event reconstruction of the primary mass. This will improve at AERA, but could not be examined in detail because of a delay in the construction. • Eine neue Methode zur Zeitkalibration mit einen Rerefenzsender (Beaco...

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A macroscopic description of coherent geo-magnetic radiation from cosmic-ray air showers

Cited by 169 publications

References 18 publications

Simulation of radio emission from air showers in atmospheric electric fields

Simulation of radio emission from air showers in atmospheric electric fields

Radio Detection of Cosmic Rays–Achievements and Future Potential

Instruments and Methods for the Radio Detection of High Energy Cosmic Rays

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