Measurement of acoustic attenuation in South Pole ice

Measurement of acoustic attenuation in South Pole ice,10.1016/j.astropartphys.2010.10.003,Astroparticle Physics,R. Abbasi,Y. Abdou,T. Abu-Zayyad,J. Ad

Measurement of acoustic attenuation in South Pole ice  
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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
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 190m and 500m. 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±0.57km−1 between 10 and 30kHz, considerably larger than previous theoretical estimates. Expressed as an attenuation length, the analyses give a consistent result for λ≡1/α of ∼300m with 20% uncertainty. No significant depth or frequency dependence has been found.
Journal: Astroparticle Physics - ASTROPART PHYSICS , vol. 34, no. 6, pp. 382-393, 2011
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