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In situ estimation ...
In situ estimation of ice crystal properties at the South Pole using LED calibration data from the IceCube Neutrino Observatory
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- Abbasi, Rasha (författare)
- Loyola Univ Chicago, Dept Phys, Chicago, IL 60660 USA
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- Beise, Jakob (författare)
- Uppsala universitet,Högenergifysik
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- Botner, Olga (författare)
- Uppsala universitet,Högenergifysik
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- Glaser, Christian (författare)
- Uppsala universitet,Högenergifysik
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- Hallgren, Allan, 1951- (författare)
- Uppsala universitet,Högenergifysik
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- O'Sullivan, Erin (författare)
- Uppsala universitet,Högenergifysik
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- Pérez de los Heros, Carlos (författare)
- Uppsala universitet,Högenergifysik
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- Sharma, Ankur (författare)
- Uppsala universitet,Högenergifysik
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- Valtonen-Mattila, Nora (författare)
- Uppsala universitet,Högenergifysik
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- Zhelnin, Pavel (författare)
- Harvard Univ, Dept Phys, Cambridge, MA 02138 USA;Harvard Univ, Lab Particle Phys & Cosmol, Cambridge, MA 02138 USA
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(creator_code:org_t)
- Copernicus Publications, 2024
- 2024
- Engelska.
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Ingår i: The Cryosphere. - : Copernicus Publications. - 1994-0416 .- 1994-0424. ; 18:1, s. 75-102
- Relaterad länk:
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.5...
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Abstract
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- The IceCube Neutrino Observatory instruments about 1 km 3 of deep, glacial ice at the geographic South Pole. It uses 5160 photomultipliers to detect Cherenkov light emitted by charged relativistic particles. An unexpected light propagation effect observed by the experiment is an anisotropic attenuation, which is aligned with the local flow direction of the ice. We examine birefringent light propagation through the polycrystalline ice microstructure as a possible explanation for this effect. The predictions of a first-principles model developed for this purpose, in particular curved light trajectories resulting from asymmetric diffusion, provide a qualitatively good match to the main features of the data. This in turn allows us to deduce ice crystal properties. Since the wavelength of the detected light is short compared to the crystal size, these crystal properties include not only the crystal orientation fabric, but also the average crystal size and shape, as a function of depth. By adding small empirical corrections to this first-principles model, a quantitatively accurate description of the optical properties of the IceCube glacial ice is obtained. In this paper, we present the experimental signature of ice optical anisotropy observed in IceCube light-emitting diode (LED) calibration data, the theory and parameterization of the birefringence effect, the fitting procedures of these parameterizations to experimental data, and the inferred crystal properties.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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