The influence of large-scale TIDs on the bearings of geographically spaced HF transmissions

Details The influence of large-scale TIDs on the bearings of geographically spaced HF transmissions The influence of large-scale TIDs on the bearings of geographically spaced HF transmissions

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..109t&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, Feb. 1984, p. 109-117. Research supported by the Minis

Physics

9

High Frequencies, Ionospheric Propagation, Radio Transmission, Traveling Ionospheric Disturbances, Bearing (Direction), Computerized Simulation, Error Analysis, Periodic Variations, Ray Tracing

Scientific paper

An investigation is made of the adequacy of the simple corrugated reflector model to simulate the effects of large-scale travelling ionospheric disturbances (TIDs) on the bearings of HF transmissions. Model results are compared with the quasi-periodic variations of bearings measured simultaneously for a number of geographically spaced transmission paths and with results obtained from 3D ray tracing studies incorporating a more realistic TID model (the 'wave' model). Although the bearing error signature is, at some times (particularly during the day), similar to that predicted by the corrugated reflector model, ray tracing calculations with the 'wave' model give generally better results and predict bearing error signatures which correspond much better to some of those observed in the experimental data than those predicted by the simpler model. However, the prediction accuracy of both models is found to be limited by temporal variation of both the TID waveform and the ambient ionosphere.

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