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Discussion papers
https://doi.org/10.5194/tc-2020-34
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-2020-34
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 11 Mar 2020

Submitted as: research article | 11 Mar 2020

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This preprint is currently under review for the journal TC.

Observation of an optical anisotropy in the deep glacial ice at the geographic South Pole using a laser dust logger

Martin Rongen1, Ryan Carlton Bay2, and Summer Blot3 Martin Rongen et al.
  • 1RWTH Aachen University, Institute for Particle Physics III B, 52074 Aachen, Germany
  • 2Department of Physics, University of California, Berkeley, CA, USA
  • 3DESY, 15738 Zeuthen, Germany

Abstract. We report on a depth-dependent observation of a directional anisotropy in the recorded intensity of back-scattered light as measured by an oriented laser dust logger. The measurement was performed in a drill hole at the geographic South Pole, about a kilometer away from the IceCube Neutrino Observatory. The drill hole remains open for access, after the SPICEcore collaboration had retrieved a 1751 m ice core. We find the measured anisotropy axis of 126 ± 3° to be compatible with the local flow direction. The observation is discussed in comparison to a similar anisotropy observed in data from the IceCube Neutrino Observatory and is able to dismiss Mie scattering based explanations in favor of a birefringence based scenario. In the future, the measurement principle, when combined with a full-chain simulation, may be used to provide a continuous record of fabric properties along the entire depth of a drill hole.

Martin Rongen et al.

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Martin Rongen et al.

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Short summary
We report on the observation of a directional anisotropy in the intensity of back-scattered light. The measurement was performed using a laser dust logger in the SP14 drill hole at the geographic South Pole. We find the anisotropy axis to be compatible with the ice flow direction. It is discussed in comparison to a similar anisotropy observed by IceCube Neutrino Observatory. In the future, the measurement principle may provide a continuous record of crystal properties along entire drill holes.
We report on the observation of a directional anisotropy in the intensity of back-scattered...
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