A realistic treatment of geomagnetic Cherenkov radiation from cosmic ray air showers
| Autor: | Krijn D. de Vries, Olaf Scholten, Klaus Werner |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) Field (physics) Numerical analysis Astrophysics::High Energy Astrophysical Phenomena Monte Carlo method Shower simulations FOS: Physical sciences Index of refraction Astronomy and Astrophysics Cosmic ray Radiation Geomagnetic Cherenkov radiation Cosmic ray air showers PULSES Nuclear physics Earth's magnetic field RADIO-EMISSION Radio emission Astrophysics - High Energy Astrophysical Phenomena Refractive index Cherenkov radiation |
| Zdroj: | Astroparticle Physics, 37, 5-16. Elsevier |
| Popis: | We present a macroscopic calculation of coherent electro-magnetic radiation from air showers initiated by ultra-high energy cosmic rays, based on currents obtained from three-dimensional Monte Carlo simulations of air showers in a realistic geo-magnetic field. We discuss the importance of a correct treatment of the index of refraction in air, given by the law of Gladstone and Dale, which affects the pulses enormously for certain configurations, compared to a simplified treatment using a constant index. We predict in particular a geomagnetic Cherenkov radiation, which provides strong signals at high frequencies (GHz), for certain geometries together with "normal radiation" from the shower maximum, leading to a double peak structure in the frequency spectrum. We also provide some information about the numerical procedures referred to as EVA 1.0. Comment: 15 pages, 26 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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