POLAR HIGH FREQUENCY RADIO PROPAGATION STUDY.
Abstract
An 18 Mc radio propagation study was conducted using a pulse transmitter and rotating directional antenna at Thule, Greenland, and a fixed directional antenna and receiving system at Pullman, Washington. The 3930 km cis-polar path is perpendicular to the auroral zone, and the zone is about 60 per cent of the distance from Thule. The results showed that the daytime MOF was consistently higher than the CRPL predicted MUF calculated by Gilbert and Hanson especially for this path. Nighttime reception was observed for 10 to 20 per cent of the time during geophysically disturbed periods. The MOF was at least two times the predicted MUF for this reception. Propagation was primarily over the great circle path. However, considerable off-great-circle propagation, attributed either to ionospheric tilts or to higher offcircle MOF values, was observed. Long-delayed pulses, appearing when the antenna main lobe pattern was about =90 degrees, were associated with sunrise-sunset effects. One clear example of forward round-the-world propagation was observed during the four months when data was available. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1964
- Accession Number
- AD0604248
Entities
People
- David H. Schrader
- Harold Hadaller
- Lloyd B. Craine
- William A. Flatt
Organizations
- Washington State University