Doppler frequency shift in ionospheric propagation of decametric radio waves /Review/
Abstract
The dynamics of the ionosphere can be studied by means of observations of the Doppler shifts of decametric radio waves which are transmitted from ground stations and reflected back to earth by the ionosphere. The experimental methods and instruments are first described, and the relationship between the Doppler frequency shifts and the variations in ionospheric parameters is discussed. The treatment of frequency deviations due to extraterrestrial causes covers sunspots, regular diurnal frequency variations, the effects of geomagnetic-field disturbances, and broadening of the signal spectrum. Processes occurring near the earth's surface are also considered. These include earthquakes, nuclear explosions, weather conditions, and atmospheric waves at ionospheric altitudes.
- Publication:
-
Radiofizika
- Pub Date:
- 1975
- Bibcode:
- 1975RaF....18..473N
- Keywords:
-
- Decametric Waves;
- Doppler Effect;
- Frequency Shift;
- Ionospheric Propagation;
- Diurnal Variations;
- Earthquakes;
- Energy Spectra;
- Geomagnetism;
- Magnetic Variations;
- Oscillographs;
- Solar Activity Effects;
- Solar Flares;
- Spectral Line Width;
- Wave Equations;
- Communications and Radar