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Observations of the direction of arrival of HF signals propagated over high latitude and mid latitude paths

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2 Author(s)
Warrington, E.M. ; Leicester Univ., UK ; Jones, T.B.

Direction of arrival measurements have been made at two locations in Canada. One is a mid-latitude site observing an East-West path approximately tangential to the auroral oval. The other is a very high latitude site close to the geomagnetic pole at which signals propagating over two paths, one short path contained entirely within the polar cap and a second trans-auroral oval path on a similar true bearing were observed. Measurements at the mid-latitude site indicated that large bearing errors of up to about -90° are observed during periods of enhanced geomagnetic activity. When large northerly bearing errors are observed at the mid-latitude site, large bearing errors are observed at the high latitude site for signals reflected from the polar cap ionosphere. A feature of these high latitude measurements is a large (±50°) quasi-periodic swing in the direction of arrival. These are attributed to reflection from patches of over-dense plasma

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Antennas and Propagation, 1993., Eighth International Conference on

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