Accession Number : AD0746636

Title :   Wave Propagation between Earth and Ionosphere Taking into Account Different Regions of Ground Conductivity and a Variable Height of the Ionosphere.

Descriptive Note : Final technical rept. Apr 71-Mar 72,

Corporate Author : TECHNISCHE HOCHSCHULE GRAZ (AUSTRIA) INSTITUT FUER RHEORETISCHE PHYSIK UND REAKTORPHYSIK

Personal Author(s) : Ledinegg,Ernst

Report Date : MAY 1972

Pagination or Media Count : 100

Abstract : It has been reported that VLF signals are sometimes damped severely when crossing the ice of Greenland under day light conditions. This anomalous attenuation occurs simultaneously with a strong proton flux coming from the sun which is known to increase the ionization of the D-layer. In order to find a theoretical explanation of this effect, in the First Year Technical Report the propagation of the field of an electric dipole between earth and ionosphere is investigated. The model proposed consists of a spherical wave guide; the surface conductivity of the inner sphere corresponds to that of sea water except for a trapezoidal domain covered by ice, while the outer surface corresponds to the boundary of the ionosphere. (Author)

Descriptors :   (*RADIO TRANSMISSION, SURFACE TO AIR), (*RADIOFREQUENCY INTERFERENCE, VERY LOW FREQUENCY), MATHEMATICAL MODELS, ATTENUATION, IONOSPHERE, GREENLAND, ICE, ELECTROMAGNETIC FIELDS, AUSTRIA

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE