On the production mechanism of MF-HF radiopulses associated with large extensive air showers

Baishya, R.; Datta, Pranayee; Kalita, P. M.; Mazumdar, G. K. D.; Pathak, K. M.

doi:10.1007/bf02509206

Cited by 4 publications

(2 citation statements)

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“…Radio emission from air showers at low MHz (and even kHz) frequencies have been performed before the renaissance of air shower radio detection, see ref. [170] and references therein. Successful detections were reported and attributed mostly to transition radiation of the air shower cascade entering the ground, but these activities did not gather significant momentum and were not independently confirmed.…”

Section: Low-frequency Radio Emissionmentioning

confidence: 99%

Radio detection of cosmic ray air showers in the digital era

2016

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In 1965 it was discovered that cosmic ray air showers emit impulsive radio signals at frequencies below 100 MHz. After a period of intense research in the 1960s and 1970s, however, interest in the detection technique faded almost completely. With the availability of powerful digital signal processing techniques, new attempts at measuring cosmic ray air showers via their radio emission were started at the beginning of the new millennium. Starting with modest, small-scale digital prototype setups, the field has evolved, matured and grown very significantly in the past decade. Today's second-generation digital radio detection experiments consist of up to hundreds of radio antennas or cover areas of up to 17 km$^{2}$. We understand the physics of the radio emission in extensive air showers in detail and have developed analysis strategies to accurately derive from radio signals parameters which are related to the astrophysics of the primary cosmic ray particles, in particular their energy, arrival direction and estimators for their mass. In parallel to these successes, limitations inherent in the physics of the radio signals have also become increasingly clear. In this article, we review the progress of the past decade and the current state of the field, discuss the current paradigm of the radio emission physics and present the experimental evidence supporting it. Finally, we discuss the potential for future applications of the radio detection technique to advance the field of cosmic ray physics.Comment: Accepted for publication in Physics Report

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Section: Low-frequency Radio Emissionmentioning

confidence: 99%

Radio detection of cosmic ray air showers in the digital era

2016

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“…The experiments and analyses cited therein agree that the standard calculations used in radio experiments are not enough to describe the measured field. Some mechanisms, such as transition radiation or deviation of particles in the geoelectric field, do not seem to be favored by the data [21,25]. Coherent deceleration of the shower front, also called sudden death pulse (SDP) has been proposed in [21,24,26] as a means to explain the low-frequency emission.…”

Section: Introductionmentioning

confidence: 99%

Calculations of low-frequency radio emission by cosmic-ray-induced particle showers

et al. 2018

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The radio technique for the detection of high energy cosmic rays consists in measuring the electric field created by the particle showers created inside a medium by the primary cosmic ray.The electric field is then used to infer the properties of the primary particle. Nowadays, the radio technique is a standard, well-established technique. While most current experiments measure the field at frequencies above 20 MHz, several experiments have reported a large emission at low frequencies, below 10 MHz. The EXTASIS experiment aims at measuring again and understand this low-frequency electric field. Since at low frequencies the standard far-field approximation for the calculation of the electric field does not necessarily hold, in order to comprehend the lowfrequency emission we need to go beyond the far-field approximation. We present in this work a formula for the electric field created by a particle track inside a dielectric medium that is valid for all frequencies. We then implement this formula in the SELFAS Monte Carlo code and calculate the low-frequency electric field of EAS. We also introduce the sudden death pulse (SDP), an emission caused by the coherent deceleration of the shower front, and study its properties.

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