In situ, broadband measurement of the radio frequency attenuation length at Summit Station, Greenland

Abstract

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 $L_{\alpha }$. We find an approximately linear dependence of $L_{\alpha }$ on frequency with the best fit of the average field attenuation for the upper 1500 m of ice: $⟨L_{\alpha }⟩=((1154\pm 121)-(0.81\pm 0.14)(\nu /$MHz$))$ m for frequencies $\nu \in [145-350]$ MHz.

13 pages, 8 figures, Accepted to Journal of Glaciology

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