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The Jindalee HF sky wave radar has been developed to carry out surveillance and remote sensing missions over Australia's northern Exclusive Economic Zone. Offering an unequaled combination of versatility, resolution, and signal processing capability, Jindalee is also a powerful instrument for observing the structure and dynamics of the ionosphere, as illustrated by the examples shown here. The interpretation of HF sky wave backscatter in terms of ionospheric phenomena is more complicated than for conventional ionosondes, but this is compensated for by the vast spatial coverage and the use of clutter analysis techniques which enable the relationship between group range and ground range to be estimated.