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[1] The three-dimensional mathematical field model of HF sky waves reflected by a spatially nonuniform nonstationary magnetoactive ionosphere is described. The model is based on the structural physical approach, which leads to complete understanding of the field structure in space and time associated with specific geomagnetic conditions.

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A precise method of predicting high‐frequency propagation characteristics in magneto active spatially nonuniform ionosphere is described. The method is designed for planning and operating radio communication links ranging 50 … 6000 km at 2.0 … 30.0 MHz. For various seasons and sunspot numbers, the method is shown to be experimentally verified for short paths which constitute the most complex conditions for propagation. In experimental testing the method features prediction error comparable with instrumental error of about 2…3 dB.

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