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One of the most tantalizing questions in astronomy and astrophysics, namelythe origin and the evolution of the cosmic accelerators that produce thehighest energy cosmic rays (UHECR), may be best addressed through theobservation of ultra high energy (UHE) cosmogenic neutrinos. Neutrinos travelfrom their source undeflected by magnetic fields and unimpeded by interactionswith the cosmic microwave background. At high energies, neutrinos could bedetected in dense, radio frequency (RF) transparent media via the Askaryaneffect. The abundant cold ice covering the geographic South Pole, with itsexceptional RF clarity, has been host to several pioneering efforts to developthis approach, including RICE and ANITA. Building on the expertise gained inthese efforts, and the infrastructure developed in the construction of theIceCube optical Cherenkov observatory, a low-cost array of radio frequencyantenna stations could be deployed near the Pole to efficiently detect asignificant number of UHE neutrinos with degree scale angular resolution withinthe next decade. Such an array, if installed in close proximity to IceCube,could allow cross-calibration on a small but invaluable subset of neutrinoevents detected by both the optical and radio methods. In addition to providingcritical information in the identification of the source of UHECRs, such anobservatory could also provide a unique probe of long baseline high energyneutrino interactions unattainable in any man-made neutrino beam.

Origin and evolution of cosmic accelerators - the unique discovery  potential of an UHE neutrino telescope: Astronomy Decadal Survey (2010-2020)  Science White Paper