Coherent radio pulses from showers in different media: A unified parameterization

Abstract

We study the frequency and angular dependences of Cherenkov radio pulses originated by the excess of electrons in electromagnetic showers in different dense media. We develop a simple model to relate the main characteristics of the electric field spectrum to the properties of the shower such as longitudinal and lateral development. This model allows us to establish the scaling of the electric field spectrum with the properties of the medium such as density, radiation length, Moliere radius, critical energy and refraction index. We normalize the predictions of the scaling relations to the numerical results obtained in our own developed GEANT4-based Monte Carlo simulation, and we give a unified parameterization of the frequency spectrum and angular distribution of the electric field in ice, salt, and the lunar regolith, in terms of the relevant properties of the media. Our parameterizations are valid for electromagnetic showers below the energy at which the Landau-Pomeranchuk-Migdal effect starts to be relevant in these media. They also provide an approximate estimate of radio emission in hadronic showers induced by high energy cosmic rays or neutrinos.

arXiv comment7 pages, 4 figures

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• Surveying the Dynamic Radio Sky with the Long Wavelength Demonstrator Array
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• A lunar radio experiment with the Parkes radio telescope for the LUNASKA project
• Prospects for Lunar Satellite Detection of Radio Pulses from Ultrahigh Energy Neutrinos Interacting with the Moon
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• On the nature of radio-wave radiation from particle cascades
• Feasibility of Determining Diffuse Ultra-High Energy Cosmic Neutrino Flavor Ratio through ARA Neutrino Observatory
• Minimal prospects for radio detection of extensive air showers in the atmosphere of Jupiter
• Radio Detection of Particles from the Cosmos
• In-ice Askaryan Emission from Air Showers: Implications for Radio Neutrino Detectors
• Cosmic Rays and the Askaryan Effect Reveal Subsurface Structure and Buried Ice on the Moon
• Radiowave Neutrino Detection
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