chapter 1 The Regular Ionosphere: Main Characteristics and Processes -- chapter 2 Nonlinear Phenomena and Plasma Instabilities in the Disturbed Irregular Ionosphere -- chapter 3 Radio Signal Presentation in the Ionospheric Communication Channel -- chapter 4 Fading Phenomena in Ionospheric Communication Channels -- chapter 5 Evolution of Plasma Irregularities in the Ionosphere -- chapter 6 Modern Radiophysical Methods of Investigation of Ionospheric Irregularities -- chapter 7 Performance of Radio Communication in Ionospheric Channels -- chapter 8 Optical and Radio Systems for Investigation of the Ionosphere and Ionospheric Communication Channels -- chapter 9 Performance of Land–Sattelite Communication Links Passing through the Irregular Ionosphere.