Measurement of Acoustic Attenuation in South Pole Ice

Details Measurement of Acoustic Attenuation in South Pole Ice Measurement of Acoustic Attenuation in South Pole Ice

2010-04-10

arxiv.org/abs/1004.1694v2

Astropart.Phys.34:382-393,2011

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

17 pages, 12 figures, published in Astroparticle Physics, 2010

Scientific paper

10.1016/j.astropartphys.2010.10.

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 alpha = 3.20 \pm 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 lambda = 1/alpha of ~1/300 m with 20% uncertainty. No significant depth or frequency dependence has been found.

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