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arXiv 2409.06388astro-ph.HEastro-ph.IM
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极高倾角宇宙线空气簇射无线电信号的直线信号传播验证

Validation of straight-line signal propagation for radio signal of very inclined cosmic ray air showers

Dieder Van den Broeck, Uzair Abdul Latif, Stijn Buitink, Krijn de Vries, Tim Huege

AI总结:

本研究通过改进CoREAS中的电场计算并引入射线追踪数据,验证了在高达600 MHz频率和88°天顶角下,极高倾角空气簇射的直线信号传播模拟方法具有准确性和有效性。

摘要:

高能宇宙粒子无线电探测器面临的一个持续挑战是准确描述无线电信号在自然非均匀介质中的传播。对于源自广延空气簇射的无线电信号,当前最先进的模拟通常隐式假设直线信号传播。然而,非均匀大气引起的折射预计会对接收信号及相关重建产生影响。对于最倾斜的几何结构,这种影响目前尚未被完全理解。在此,我们提出了一项关于在模拟与极高倾角空气簇射几何结构相关的无线电发射时,直线信号传播有效性的研究。为此,通过使用列表化的射线追踪数据,改进了基于CoREAS中所使用的端点形式的电场计算。我们发现,在低于600 MHz的频率下工作时,辐射能量存在2%的差异,方向重建存在O(0.01°)的差异。因此我们发现,对于高达600 MHz的频率和高达88°的天顶角,当前基于直线的模拟方法是准确的。

英文摘要:

An ongoing challenge for radio-based detectors of high-energy cosmic particles is the accurate description of radio signal propagation in natural nonuniform media. For radio signals originating from extensive air showers, the current state of the art simulations often implicitly assume straight-line signal propagation. The refraction due to a nonuniform atmosphere is however expected to have an effect on the received signal and associated reconstruction. This effect is currently not completely understood for the most inclined geometries. Here, we present a study regarding the validity of straight-line signal propagation when simulating radio emission associated with very inclined air shower geometries. To this end, the calculation of the electric field based on the end point formalism used in CoREAS was improved by use of tabulated ray tracing data. We find a difference of 2% in radiation energy and a difference of O(0.01°) on direction reconstruction when working at frequencies below 600 MHz. We thus find that, for frequencies up to 600 MHz and zenith angles up to 88°, the current straight-line based simulation approaches are accurate.

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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