Radio pulses from ultra-high energy atmospheric showers as the superposition of Askaryan and geomagnetic mechanisms

被引:27
作者
Alvarez-Muniz, Jaime [1 ,2 ]
Carvalho, Washington R., Jr. [1 ,2 ]
Schoorlemmer, Harm [3 ]
Zas, Enrique [1 ,2 ]
机构
[1] Univ Santiago de Compostela, Dept Fis Particulas, Santiago De Compostela 15782, Spain
[2] Univ Santiago de Compostela, Inst Galego Fis Altas Enerxias, Santiago De Compostela 15782, Spain
[3] Univ Hawaii Manoa, Dept Phys & Astron, Honolulu, HI 96822 USA
关键词
High energy cosmic rays; Extensive air showers; Askaryan radio emission; MONTE-CARLO SIMULATIONS; AIR; EMISSION; RADIATION; MAXIMUM;
D O I
10.1016/j.astropartphys.2014.04.004
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Radio emission in atmospheric showers is currently interpreted in terms of radiation due to the deviation of the charged particles in the magnetic field of the Earth and to the charge excess (Askaryan effect). Each of these mechanisms has a distinctive polarization. The complex signal patterns can be qualitatively explained as the interference (superposition) of the fields induced by each mechanism. In this work we explicitly and quantitatively test a simple phenomenological model based on this idea. The model is constructed by isolating each of the two components at the simulation level and by making use of approximate symmetries for each of the contributions separately. The results of the model are then checked against full ZHAireS Monte Carlo simulations of the electric field calculated from first principles. We show that the simple model describes radio emission at a few percent level in a wide range of shower-observer geometries and on a shower-by-shower basis. As a consequence, this approach provides a simple method to reduce the computing time needed to accurately predict the electric field of radio pulses emitted from air showers, with many practical applications in experimental situations of interest. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:29 / 38
页数:10
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