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Keywords:

  • ionospheric propagation;
  • scintillation index;
  • inhomogeneities;
  • fluctuations;
  • coherence function

[1] The characteristics of random ionospheric inhomogeneities are described, including their dependency on the geophysical parameters. They are used in a propagation model to estimate the propagation errors and the fades of the transmitted signals. Margins to be included in a budget link are subsequently determined. Features of our propagation model, Global Ionospheric Propagation Model (GIM), are presented with typical results for VHF and L band links.