A realistic treatment of geomagnetic Cherenkov radiation from cosmic ray air showers

被引：66
作者：
Werner, Klaus [1 ]
de Vries, Krijn D. [2 ]
Scholten, Olaf [2 ]
机构：
[1] Univ Nantes, IN2P3, CNRS, SUBATECH,EMN, Nantes, France
[2] Univ Groningen, Kernfys Versneller Inst, NL-9747 AA Groningen, Netherlands
来源：
ASTROPARTICLE PHYSICS | 2012年 / 37卷
关键词：
Radio emission; Cosmic ray air showers; Shower simulations; Index of refraction; Geomagnetic Cherenkov radiation; RADIO-EMISSION; PULSES;
D O I：
10.1016/j.astropartphys.2012.07.007
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：5 / 16
页数：12
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