NEAR FIELDS AND ANTIPODAL FIELDS IN THE TERRESTRIAL EARTH-TO-IONOSPHERE WAVE GUIDE.
Abstract
Near fields of a vertical electric dipole are expressed as a series of zonal harmonics or as a summation of wave-guide modes. These representations are compared with dipole fields on a conducting ground plane and with field calculations using the method of images or ray theory. The series of zonal harmonics and the mode sum provide nearly identical near fields; their difference characterizes the contribution of so-called branch-cut waves and is negligible in the present computational model. In the near field range, the method of images gives the simplest field representation for ELF; for VLF, a useful approximation is provided by combining the ground wave and a single sky wave. At the upper wave-guide boundary, the radial electric fields are finite; but the other field components vanish when approaching the source axis. The field components exhibit similar variations also when approaching the antipode of the source. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1968
- Accession Number
- AD0679164
Entities
People
- Janis Galejs
Organizations
- Sylvania Electric Products