Dmitry Chirkin from the Wisconsin IceCube Particle Astrophysics Center, University of Wisconsin (Madison, WI), Martin Rongen from RWTH Aachen University (Aachen, Germany), and others in the IceCube Collaboration have looked into the idea that the microstructure of the ice as it has been affected by ice flow has led to the formation of a birefringent polycrystal structure, which can explain the direction-dependent differences in attenuation.
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