Multisite Observations of the VLF Transequatorial Propagation Anomaly
Article first published online: 7 DEC 2012
Copyright 1969 by the American Geophysical Union.
Volume 4, Issue 3, pages 203–212, March 1969
How to Cite
1969), Multisite Observations of the VLF Transequatorial Propagation Anomaly, Radio Sci., 4(3), 203–212, doi:10.1029/RS004i003p00203.(
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Received: 26 AUG 1968
Phase and amplitude records of 18.6-kHz transmissions from NPG/NLK received at eight sites varying in distance from 4,360 to 13,420 km southwest of the transmitter, confirm the existence of a region within ±20° of the magnetic equator, in which VLF propagation parameters vary significantly from their midlatitude values. At all seven sites that involved transequatorial propagation paths, anomalies (including cycle slipping) were observed during the sunrise transition. The nature and temporal occurrence of these anomalies depended on the distance of the receiver from the magnetic equator. The experimentally derived dependence on magnetic latitude of the mode conversion ratio of the two least attenuated propagating modes and their apparent interference spacing are presented.