Long-baseline horizontal radio-frequency transmission through polar ice. (arXiv:1908.10689v3 [astro-ph.IM] UPDATED)

Long-baseline horizontal radio-frequency transmission through polar ice. (arXiv:1908.10689v3 [astro-ph.IM] UPDATED)
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We report on analysis of englacial radio-frequency (RF) pulser data received
over horizontal baselines of 1–5 km, based on broadcasts from two sets of
transmitters deployed to depths of up to 1500 meters at the South Pole. First,
we analyze data collected usingtwo RF bicone transmitters 1400 meters below the
ice surface, and frozen into boreholes drilled for the IceCube experiment in
2011. Additionally, in Dec., 2018, a fat-dipole antenna, fed by one of three
high-voltage (~1 kV), fast (~(1-5 ns)) signal generators was lowered into the
1700-m deep icehole drilled for the South Pole Ice Core Experiment (SPICE),
approximately 3 km from the geographic South Pole. Signals from transmitters
were recorded on the five englacial multi-receiver ARA stations, with receiver
depths between 60–200 m. We confirm the long, >1 km RF electric field
attenuation length, test our observed signal arrival timing distributions
against models, and measure birefringent asymmetries at the 0.15% level.

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