Main ionospheric trough as a channel for MF propagation in the magnetosphere
Article first published online: 7 DEC 2012
Copyright 1997 by the American Geophysical Union.
Volume 32, Issue 4, pages 1477–1490, July-August 1997
How to Cite
1997), Main ionospheric trough as a channel for MF propagation in the magnetosphere, Radio Sci., 32(4), 1477–1490, doi:10.1029/97RS00249., , and (
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 28 JAN 1997
- Manuscript Received: 25 MAR 1996
By interpretation of the long-delayed echoes (L=3.2) observed on the frequency 1.8 MHz, the most probable mechanism of propagation was found to be wave guiding in the odd magnetospheric channel such as the main ionospheric trough. The method of numerical simulation of the middle wave propagation allowed us to formulate (1) the conditions of trapping and keeping waves in a channel and (2) the relations between the positions of the transmitter, the trough, and the plasmapause corresponding to both the echo appearance and the wave passing to the magneto-conjugate region as far as the Earth's surface. Similar conditions and relations are satisfied in a wide range of frequencies and L shells of the transmitter and may be used for finding the position of the trough and the plasmapause.