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arXiv 0811.1099astro-ph
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在South Pole深冰和环境条件中的声学噪声

Acoustic noise in deep ice and environmental conditions at the South Pole

Timo Karg

摘要:

为了研究南极冰的声学特性,南极声学测试装置(SPATS)安装在冰立方中微子观测站的钻孔上部。未来声学中微子望远镜设计的一个重要参数是冰中的声学背景噪声及其时空变化。我们研究了SPATS数据的绝对噪声水平深度剖面并讨论了系统不确定性。在一年的数据采集中,测得的噪声非常稳定,我们估计在200米以下的深度,在10 kHz至50 kHz的频率范围内,绝对噪声水平< 10 mPa。这种噪音水平与在良好天气条件下基于海洋的声学中微子探测项目所观察到的数量级相同。

英文摘要:

To study the acoustic properties of the Antarctic ice the South Pole Acoustic Test Setup (SPATS) was installed in the upper part of drill holes for the IceCube neutrino observatory. An important parameter for the design of a future acoustic neutrino telescope is the acoustic background noise in the ice and its spatial and temporal variations. We study the absolute noise level depth profile from SPATS data and discuss systematic uncertainties. The measured noise is very stable over one year of data taking, and we estimate the absolute noise level to be < 10 mPa in the frequency range from 10 kHz to 50 kHz at depths below 200 m. This noise level is of the same order of magnitude as observed by ocean based acoustic neutrino detection projects in good weather conditions.

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