[Titel fehlt]

Radio-Observations of the Ionosphere.- A. Theory of wave propagation.- I. Conductivity tensor.- II. Basic equations for geometric optics.- III. Polarization and refractive index.- IV. Group propagation and refraction.- V. Wave optics.- B. Sounding technique.- I. Transmitting.- II. Receiving.- III. Other techniques.- C. Interpretation and reduction.- I. Routine analysis.- II. Height distribution of electron density.- III. Special measurements.- D. Sounding results.- I. General remarks.- II. Normal (thick) layers.- III. Sporadic (thin) layers.- IV. Disturbed conditions.- E. Other investigations from ground.- I. Special absorption measurements.- II. Irregularities and drifts.- F. Space research and terrestrial ionosphere.- I. Phase methods.- II. Other methods and results.- General references.- Append.- Systems of units for electromagnetic quantities.- List of symbols.- Lunar Tides in the Ionosphere.- A. Introduction.- B. Observations of lunar variations in the ionosphere.- I. Lunar tide analysis of ionospheric data obtained with vertical incidence ionosondes.- II. Observations of tidal wind in the ionosphere by radio methods.- C. Theory of lunar variations in the ionosphere.- I. Lunar tidal variations in the surface atmosphere.- II. Lunar tidal winds and electric fields in the upper atmosphere deduced from geomagnetic lunar variations.- III. Cause of lunar variations in the ionosphere.- D. Conclusion.- E. Supplement.- References.- Sachverzeichnis (Deutsch-Englisch).- Subject Index (English-German).