Optical Properties of the South Pole Ice at Depths Between 0.8 and 1 km
The optical properties of the ice at the geographical South Pole have been investigated at depths between 0.8 and 1 kilometers. The absorption and scattering lengths of visible light ($\sim$515 nm) have been measured {\it in situ } using the laser calibration setup of the AMANDA neutrino detector. T...
| Main Author: | |
|---|---|
| Format: | Text |
| Language: | unknown |
| Published: |
arXiv
1994
|
| Subjects: | |
| Online Access: | https://dx.doi.org/10.48550/arxiv.astro-ph/9412028 https://arxiv.org/abs/astro-ph/9412028 |
| Summary: | The optical properties of the ice at the geographical South Pole have been investigated at depths between 0.8 and 1 kilometers. The absorption and scattering lengths of visible light ($\sim$515 nm) have been measured {\it in situ } using the laser calibration setup of the AMANDA neutrino detector. The ice is intrinsically extremely transparent. The measured absorption length is 59 $\pm$ 3 meters, comparable with the quality of the ultra-pure water used in the IMB and Kamiokande proton-decay and neutrino experiments and more than two times longer than the best value reported for laboratory ice. Due to a residual density of air bubbles at these depths, the trajectories of photons in the medium are randomized. Assuming bubbles are smooth and spherical, the average distance between collisions at 1 km depth is about 25 cm. The measured inverse scattering length on bubbles decreases linearly with increasing depth in the volume of ice investigated. : Accepted for publication in Science. 16 pages uuencoded PostScript |
|---|