Measurement of acoustic attenuation in South Pole ice

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• 作者：R. Abbasi ; Y. Abdou ; T. Abu-Zayyad ; J. Adams ; J.A. Aguilar ; M. Ahlers ; K. Andeen ; J. Auffenberg ; X. Bai ; M. Baker ; S.W. Barwick ; R. Bay ; J.L. Bazo Alba ; K. Beattie ; J.J. Beatty ; S. Bechet ; J.K. Becker
• 关键词：Neutrino astronomy ; Acoustics ; South Pole ; Acoustic attenuation ; Ice
• 刊名：Astroparticle Physics
• 出版年：2011
• 出版时间：January 2011
• 年：2011
• 卷：34
• 期：6
• 页码：382-393
• 全文大小：781 K

文摘

Using the South Pole Acoustic Test Setup (SPATS) and a retrievable transmitter deployed in holes drilled for the IceCube experiment, we have measured the attenuation of acoustic signals by South Pole ice at depths between 190 m and 500 m. Three data sets, using different acoustic sources, have been analyzed and give consistent results. The method with the smallest systematic uncertainties yields an amplitude attenuation coefficient α = 3.20 ± 0.57 km⁻¹ between 10 and 30 kHz, considerably larger than previous theoretical estimates. Expressed as an attenuation length, the analyses give a consistent result for λ ≡ 1/α of 300 m with 20 % uncertainty. No significant depth or frequency dependence has been found.