Radio emission from cosmic ray air showers

Huege, T.; Falcke, H.

doi:10.1051/0004-6361:20031422

Cited by 144 publications

(160 citation statements)

References 26 publications

Supporting

Mentioning

154

Contrasting

Order By: Relevance

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

Simulation of radio emission from air showers in atmospheric electric fields

Buitink

Huege

Falcke

et al. 2010

Astroparticle Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Nevertheless, AERA can benefit from the improved signal-to-noise ratio and precision of an interferometric cross-correlation beam analysis. The signal-to-noise ratio of the cross-correlation beam scales with the number of antennas, while the precision of any fit to the lateral distribution is supposed improve with the square root of the number of antennas, only [42]. In addition, beamforming allows to exploit also those antennas for reconstruction which have not triggered themselves because of a weak signal, but were triggered by other antenna stations.…”

Section: A Reference Beacon For the Auger Engineering Radio Arraymentioning

confidence: 99%

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

Schröder¹

2012

Springer Theses

View full text Add to dashboard Cite

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...

show abstract

“…In a first step, we studied the emission with a frequency-domain analytical model, analysing in particular the important coherence effects arising because the length scales present in the air shower are of the same order as the observing wavelength in the frequency range of LOPES [8]. In a second step, we developed a detailed time-domain Monte Carlo simulation of the emission process [9] predicting the radio emission and its dependence on different air shower parameters with unprecedented detail [10].…”

Section: Simulationsmentioning

confidence: 99%

Radio detection of cosmic ray air showers with LOPES

Huege

Apel

Asch

et al. 2007

Nuclear Physics B - Proceedings Supplements

Self Cite

View full text Add to dashboard Cite

In the last few years, radio detection of cosmic ray air showers has experienced a true renaissance, becoming manifest in a number of new experiments and simulation efforts. In particular, the LOPES project has successfully implemented modern interferometric methods to measure the radio emission from extensive air showers. LOPES has confirmed that the emission is coherent and of geomagnetic origin, as expected by the geosynchrotron mechanism, and has demonstrated that a large scale application of the radio technique has great potential to complement current measurements of ultra-high energy cosmic rays. We describe the current status, most recent results and open questions regarding radio detection of cosmic rays and give an overview of ongoing research and development for an application of the radio technique in the framework of the Pierre Auger Observatory.

show abstract

Radio emission from cosmic ray air showers

Cited by 144 publications

References 26 publications

Simulation of radio emission from air showers in atmospheric electric fields

Simulation of radio emission from air showers in atmospheric electric fields

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

Radio detection of cosmic ray air showers with LOPES

Contact Info

Product

Resources

About