STUDY OF HF STEEP-ANGLE ANOMALIES
Abstract
Results are given of a study of hf steep-angle anomalies by means of a program of signal analysis and data recording and through theAPPLICATI N OF MAGNETOIONIC THEORY. Two types of anomalies were studied: Cusp fading, observed as a periodic variation of signal strength over paths of several hundred miles, and the two-tone effect, observed when receiving WWV over a 58-mile path. Conclusions were that periodic fading to deep cusps apparently resulted from magnetoionic interference in the F layer. Changes in median recorded level of WWV reception with tone modulation were explicable as a diversity effect for the ground backscatter signal and a result of dissimilar carrier and sideband antenna patterns for layer propagation. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1962
- Accession Number
- AD0274682