Long-distance HF propagation modes deduced from the simultaneous observation by chirp sounder and ISS-b
Abstract
Chirp oblique sounding data and ionospheric data gathered by the ISS-b satellite were analyzed to characterize the propagation modes between West Germany and Japan. Hourly ionograms were generated from November 1978 to May 1979 using chirp sounder operating in the 4-30 MHz range, and ionospheric conditions were measured each time the ISS-b orbit crossed the circuit. Propagation times were quantified for each frequency step by entering the measured ionosphere parameters into a parabolic model for the F2 layer. Simulations were performed for 3- to 5-hop propagation modes and compared with empirical data, showing that the MOF exceeds a theoretical MUF by 1 MHz.
- Publication:
-
Radio Research Laboratory, Review
- Pub Date:
- June 1982
- Bibcode:
- 1982RaRLR..28..357I
- Keywords:
-
- Ionospheric Propagation;
- Japanese Spacecraft;
- Propagation Modes;
- Radio Communication;
- Satellite Sounding;
- F 2 Region;
- High Frequencies;
- Ionograms;
- Japan;
- Sweep Frequency;
- West Germany;
- Communications and Radar