格陵兰Summit站射频衰减长度的现场宽带测量
In situ, broadband measurement of the radio frequency attenuation length at Summit Station, Greenland
摘要：
在过去的25年里，利用冷的极地冰作为中微子目标，对中微子产生的信号进行无线电波探测，可能是探测河外超高能中微子（对应于中微子能量超过0.01焦耳，或$10^{17}$电子伏特）最有前途的技术。在2021年夏季，随着格陵兰射电中微子天文台（RNO-G）的初步部署，我们在格陵兰Summit Station进行了射电冰川测量，以完善我们对冰目标的理解。我们报告了一个这样的测量结果，射频电场衰减长度$L_α$。我们发现$L_α$对频率的近似线性依赖关系，最适合的平均场衰减为上1500米的冰：$\langle L_α\rangle = \big( (1154 \pm 121) - (0.81 \pm 0.14) (ν/$ MHz $)\big)$ m的频率$ν\in [145 - 350]$ MHz。
英文摘要：
Over the last 25 years, radiowave detection of neutrino-generated signals, using cold polar ice as the neutrino target, has emerged as perhaps the most promising technique for detection of extragalactic ultra-high energy neutrinos (corresponding to neutrino energies in excess of 0.01 Joules, or $10^{17}$ electron volts). During the summer of 2021 and in tandem with the initial deployment of the Radio Neutrino Observatory in Greenland (RNO-G), we conducted radioglaciological measurements at Summit Station, Greenland to refine our understanding of the ice target. We report the result of one such measurement, the radio-frequency electric field attenuation length $L_α$. We find an approximately linear dependence of $L_α$ on frequency with the best fit of the average field attenuation for the upper 1500 m of ice: $\langle L_α\rangle = \big( (1154 \pm 121) - (0.81 \pm 0.14) (ν/$MHz$)\big)$ m for frequencies $ν\in [145 - 350]$ MHz.
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