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arXiv 2201.01298astro-ph.HEastro-ph.IMhep-exhep-ph
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粒子级联无线电波辐射的性质

On the nature of radio-wave radiation from particle cascades

Clancy W. James

摘要:

地球大气层和冰等稠密介质中的粒子级联产生的无线电波辐射的性质历来备受争议。这种情况在2010年代初发生了变化,社区集中在“地磁”和“Askaryan”辐射的共同术语来描述这两种发射机制。然而,这种趋同是在各种会议和讲习班的讨论中产生的,并最终通过模拟代码和实验测量之间的协议达成。因此,在这篇文章中,我使用相对简单的几何参数,和基于单粒子轨迹的最小计算,来解释密集介质(如冰)中的广泛空气簇射(EAS)和级联辐射的性质。我确定的频率制度,从Askaryan效应的辐射将韧致辐射样和切连科夫样,分别低于/高于1 GHz的EAS和100 MHz的致密介质;和地磁发射将横向电流样,它将类似于同步辐射,分别低于/高于几GHz的EAS,取决于级联发展的高度。我建议如何在实验中观察到这些发射性质的转变。

英文摘要:

The nature of the radio-wave radiation generated by particle cascades in both the Earth's atmosphere and dense media such as ice has, historically, been much debated. This situation changed in the early 2010's, with the community converging on the common terminology of "geomagnetic" and "Askaryan" radiation to describe the two emission mechanisms. However, this convergence arose from discussions at various conferences and workshops, and was ultimately reached through agreement between simulation codes and experimental measurements. In this article therefore, I use relatively simple geometrical arguments, and a minimum of calculations based on single particle tracks, to explain the nature of radiation from extensive air showers (EAS) and cascades in dense media such as ice. I identify well-determined frequency regimes where the radiation from the Askaryan effect will be bremsstrahlung-like and Cherenkov-like, being respectively below/above 1 GHz in EAS and 100 MHz in dense media; and where geomagnetic emission will be transverse-current-like and where it will resemble synchrotron radiation, respectively below/above a few GHz in EAS, depending on the height of cascade development. I suggest how these transitions in the nature of the emission may be experimentally observed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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