Determination of Effective Ionospheric Electron Density Profiles for VLF/LF Propagation.
Abstract
This document is one of a series issued by the DCA/MEECN System Engineer which is directed at definitive prediction of the time availability of VLF/LF radio system included in the MEECN. The studies described in this report are critical to VLF/LF system performance. The tri-Service Propagation program was established by the MEECN System Engineer to improve the accuracy and reliability of VLF/LF link integrity analyses. This report presents experimental data derived from field strengths of VLF/LF signals between 9 and 56 kHz measured on several mid-latitude paths. Comparisons between experimental data and theoretical predications are shown for several flights, both in daytime and in nighttime, over the path from Hawaii to southern California. The comparisons show that an essentially constant exponential electron density profile describes the data for all the frequencies in the above range for daytime; whereas at night, the best fit exponential profile gradient increases with frequency.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1976
- Accession Number
- ADA047958
Entities
Organizations
- Defense Information Systems Agency