Mechanism of Radio Emission from Extensive Air Showers

Allan, H. R.; Neat, K. P.; Jones, James

doi:10.1038/215267a0

Cited by 25 publications

(30 citation statements)

References 6 publications

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“…The first suggestion that these air showers also could produce radio emission was made 11 on the basis of a charge-excess mechanism, which is very strong for showers developing in solid media 12, 13 . In a couple of experimental activities in the 1960s and 1970s, coincidences between radio pulses and cosmic ray events were indeed reported 14,15 . Owing to the limitations of electronics in those days, the measurements were cumbersome and did not lead to useful relations between radio emission and air shower parameters.…”

mentioning

confidence: 99%

Detection and imaging of atmospheric radio flashes from cosmic ray air showers

Falcke

Apel²,

Badea³

et al. 2005

Nature

353

317

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mentioning

confidence: 99%

Detection and imaging of atmospheric radio flashes from cosmic ray air showers

Falcke

Apel²,

Badea³

et al. 2005

Nature

353

317

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“…The present challenges are to understand the emission mechanisms and the features of the radio signal, and to develop an adequate measuring instrument. Electron-positron pairs generated in the shower development are separated and deflected by the Earth's magnetic field [1], [2], hence they introduce an electromagnetic emission. During shower development, charged particles are concentrated in a shower disk of a few meters thickness.…”

Section: Introductionmentioning

confidence: 99%

FPGA Based Serial and Single-Clock Cycle Pipelined Fast Fourier Transforms in a Radio Detection of Cosmic Rays

Szadkowski¹

2013

Design and Architectures for Digital Signal Processing

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“…The fitted function describes a uniform exponential decrease, like it is expected from historic experiments [50], and like it has recently been used in [77]:…”

Section: Exponential Fitmentioning

confidence: 99%

“…Moreover, understanding these effects is crucial to reproduce results, and to compare them to other experiments. A lack of quantitative reproducibility has been one of the major problems of historic experiments [50].…”

Section: Lateral Distributionmentioning

confidence: 99%

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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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Mechanism of Radio Emission from Extensive Air Showers

Cited by 25 publications

References 6 publications

Detection and imaging of atmospheric radio flashes from cosmic ray air showers

Detection and imaging of atmospheric radio flashes from cosmic ray air showers

FPGA Based Serial and Single-Clock Cycle Pipelined Fast Fourier Transforms in a Radio Detection of Cosmic Rays

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

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