Accession Number : AD0697309

Title :   F-LAYER REFLECTIONS AND ION EFFECTS IN THE PROPAGATION OF TERRESTRIAL ELF WAVES.

Descriptive Note : Research rept.,

Corporate Author : SYLVANIA ELECTRONIC SYSTEMS-EAST WALTHAM MASS APPLIED RESEARCH LAB

Personal Author(s) : Galejs,Janis

Report Date : OCT 1969

Pagination or Media Count : 32

Abstract : During nighttime waves penetrate above the D-layer and propagation parameters of the earth-to-ionosphere wave guide are dependent on the detailed ionospheric structure below the F-layer. The propagation characteristics are dependent on the altitude of the F-layer, electron density below this layer, the magnitude of the radial static magnetic field component, and also on ions that tend to increase the absorption of the penetrating magneto-ionic mode. The individual models advanced for the ionosphere are not representative of long distance or global wave propagation; but the average of the propagation parameters derived for a number of propagation geometries is comparable to the parameters deduced from an isotropic ionosphere model, where waves are confined to altitudes below 100 km. (Author)

Descriptors :   (*IONOSPHERIC PROPAGATION, EXTREMELY LOW FREQUENCY), IONOSPHERE, ELECTROMAGNETIC WAVE REFLECTIONS, ATMOSPHERE MODELS, ATTENUATION, ELECTRON DENSITY

Subject Categories : Atmospheric Physics
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE