Abstract
The TIGER SuperDARN OTHR systems are located in Tasmania and New Zealand. The fields of view encompass approximately 4,000,000 km 2 of the Southern Ocean. High time resolution in-phase and quadrature samples out to ranges >3000 km were collected using a specialised radar control programme. Radio waves refracted by the ionosphere are backscattered in-phase from ocean waves of length equal to half the transmitted wavelength. Wind driven ocean waves propagate omnidirectionally with peak energy in the prevailing wind direction. The components of wave energy propagating directly towards and away from the radar are observed in Doppler spectra as Bragg peaks. The dominant wind-wave direction can be inferred by constraining a model of the directional sea spectrum to the ratio of the two Bragg peaks. The ability to determine the dominant wind-wave direction free of ambiguities over a >500,000 km 2 region of the Southern Ocean was demonstrated.
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