A Comparison of Measured and Calculated VLF Phase Velocities for Day and Night.
Abstract
Measurements of phase velocity at vlf are made using separated time- and phase-synchronized receivers to obtain phase differentials, and such measurements are compared with theoretical values. Daytime measurements of vlf phase velocity are found to be in good agreement with theoretical values, within the accuracy permitted by the known distance between the receiving sites and an assumed horizontally homogeneous ionospheric model. It is also determined that measured values of phase velocity at night and also at transition times (sunrise and sunset) cannot be effectively compared with theoretical values unless a time-varying ionospheric model is employed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 20, 1972
- Accession Number
- AD0753206
Entities
People
- J. A. Ferguson
- W. D. Westfall
Organizations
- Naval Information Warfare Systems Command