A test of the International Reference Ionosphere using single-frequency A1 data

Physics

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Electromagnetic Absorption, Ionospheric Propagation, Radio Probing, Reference Atmospheres, Atmospheric Attenuation, D Region, Ionospheric Electron Density, Reflected Waves

Scientific paper

A1 absorption and virtual reflection height data recorded at Camden, Australia during the period February 1980-January 1981 were compared with values calculated using the latest version of the International Reference Ionosphere - IRI 79. Systematic differences of 10-25 dB in absorption and 2-4 km in virtual height indicate that the IRI electron densities are too high for the lower ionosphere. A better fit between theory and experiment at Camden may be achieved by extending the top altitude of the D-region (i.e., the IRI parameter HDX) and by using a different profile shape to connect the D-region to the peak of the E-region.

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